| digi01 |
the digital volume control design that I and my friends developed together.it almost be finished.
the circuit is to utilize a programmable mcu to control a group of relays to deal the switching of R-2R mode.and it has been set up a extend interface,for using those PGA chip such as PGA2310.
here is the R/2R Ladder Networks article.
the test version used six relays.steps of switching is 2^6=256.
sch pdf file: |
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| digi01 |
the design is finished.any comments are welcomed:D
pic show
1,main PCB board |
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| digi01 |
| 2,LCD and remote LED setting up,I will do a test now.wish it can work fine. |
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| Thomas |
| quote: | Originally posted by digi01
the test version used six relays.steps of switching is 2^6=256.
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2^6 = 64 ;) |
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| digi01 |
| quote: | Originally posted by Thomas
2^6 = 64 ;) |
Thomas,you are right.this test version is 64 steps:D |
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| gmphadte |
2^6 = 64
looks like it is 128 steps control |
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| JasonL |
| ill buy a board.. i like the layout alot : O ) perfect for a gain clone pre-amp. |
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| digi01 |
| quote: | Originally posted by gmphadte
2^6 = 64
looks like it is 128 steps control |
It should be 64 steps.
I have used six relays for R-2R ladder networks and four relays for input selecting.the mcu controls these relays through 6 I/Os.
#volume control trace:MCU(AT98S8252,eprom including)=>U6 ULN2003A(interface darlinton driver)=>relays(K1-K6)
#4 signal source trace:MCU=>U5=>relays
#mute:the control signal comes out from mcu, lead to outside interface.there is no relay for mute control on the main board.
digi |
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| digi01 |
| quote: | Originally posted by JasonL
ill buy a board.. i like the layout alot : O ) perfect for a gain clone pre-amp. |
thank you:)
the compatible test of hardware and the strong test of software that I have already done,the result is very ideal.
here is some specification:
#64 steps R-2R ladder networks volume control
#4 input selecting
#mute
#volume state keeps after switch off
#LCD 16*2,compatibility HD44780 VFD
#infrared ray remote control available
MCU AT89S8252
Developing tools is Keil,C language.
here is the remote control pic: |
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| rabstg |
Hey digi01-
This looks like a neat project.
Will you be offering this as a kit with all the needed parts to assemble?
If so, I'm in.
Also, when will a Multi-channel version be available? :D |
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| banana |
Hi Digi01,
A quick question. It's a 6-bit R2R network, so is it having 6*6=36dB adjustment range? |
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| blu_line |
I would add 2 more sections and drop the 5 k resistor before the connector.
grtz
Simon |
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| mhelin |
| Would it be possible to reserve some pins on MCU for an expansion circuit. It would be nice if you could design or use another board without MCU to expand the number of channels (from 2 to 4 to 6). I need 4 channels for active speaker system, other people could have some use for 6 channels or even 8 for home theater use. Also is it possible for you to make analog tests (with Audio Precision or the RMAA software and a good quality sound card). If not then maybe someone who builds this kit could do it. How about EMC? Are there separate ground planes etc. (obviously). If there are any problems with EMC and such things it's no use of a good quality attenuator. |
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| digi01 |
| quote: | Originally posted by rabstg
Hey digi01-
This looks like a neat project.
Will you be offering this as a kit with all the needed parts to assemble?
If so, I'm in.
Also, when will a Multi-channel version be available? :D |
thank you rabstg.
the upper one is only a test version,I am still modifying it.wish it can be in more common use.Perhaps will offer kits afterwards.
digi |
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| JasonL |
| I wonder if my LCD will work with this or not.. |
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| maxw |
Digi01, what would a kit of this cost approx?
Even if you dont get around to it I am still interested in the costs of the components used in this:) |
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| digi01 |
| the full kit is around 50 dollars.please waiting for some days;) |
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| digi01 |
| quote: | Originally posted by JasonL
I wonder if my LCD will work with this or not.. |
what about your LCD?
the interface of digital vol can drive 16*2 oem LCD.and it has compatibility HD44780 VFD.
here is the interface port assign,office2000 word doc file. |
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| maxw |
| quote: | Originally posted by digi01
the full kit is around 50 dollars.please waiting for some days;) |
I'm waiting ;)
| quote: | Originally posted by digi01
it has ompatibility HD44780 |
That LCD controller is VERY common so it will be no problem getting one to work with it. |
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| digi01 |
| quote: | Originally posted by banana
Hi Digi01,
A quick question. It's a 6-bit R2R network, so is it having 6*6=36dB adjustment range? |
I am do not know your meaning.the digital vol is only a resistors based pot but control by mcu.you can imagine it is a 64 steps attenuator.
| quote: | Originally posted by mhelin
Would it be possible to reserve some pins on MCU for an expansion circuit. It would be nice if you could design or use another board without MCU to expand the number of channels (from 2 to 4 to 6). I need 4 channels for active speaker system, other people could have some use for 6 channels or even 8 for home theater use. Also is it possible for you to make analog tests (with Audio Precision or the RMAA software and a good quality sound card). If not then maybe someone who builds this kit could do it. How about EMC? Are there separate ground planes etc. (obviously). If there are any problems with EMC and such things it's no use of a good quality attenuator. |
thank you for your ideas:) I will consider it thereafter. |
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| maxw |
| needs more inputs though....like 6:smash: |
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| banana |
| quote: | Originally posted by digi01
I am do not know your meaning.the digital vol is only a resistors based pot but control by mcu.you can imagine it is a 64 steps attenuator.
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I mean the "dynamic range" of your pot. The difference in attenuation between maximum volume and minimum volume.
I have no experience on R2R volume pot. Base of the simple logic, R2R DAC shouuld have 6dB dynamic range per number of bit (96dB for 16bit, 144dB for 24bit). Just wonder R2R attenuator would behave the same :confused: |
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| mhelin |
With attenuator it's "attenuation range", not dynamic range. The dynamic range depends on how much noise the attenuator generates or how much it distorts the signal.
Digi, I have some more questions regarding the MCU. The expansion is one (it's quite easy as you can use the same 6 bit signal from MCU, but a separete header for it would be nice, and a cheaper PCB without the MCU part). Another question is the MCU itself, it's Atmels 8051 derivate, but the C-compiler is commercial. Can it be programmed using the same programmer as for AVR's (AT90S8515 etc.)? Is the ISP header the same 10-pin one? Also is it possible to use some other C-compiler (like GCC)? Also does the kit include the MCU device (programmed?). On the other hand there is no need to reprogram the MCU if it could support quite a large number of remote controllers. So if you pick up the RC5 codes for some common devices (Sony, Philips etc.) and use a generic remote controller which knows these devices everything should work like charm.
Regarding the use of relays, how much noise they keep when you adjust the volume? I was suggested that the reed relays also could be used and they were much less noisy. I mean the noise the relay contacts make, not the noise generated by the circuits (EMC). |
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| mhelin |
| Digi, I have a suggestion. Just design the PCB which got the relays (and try the reed relays, too). Put a 8-pin (2x4) header there (6 bits, ground, Vcc). Now one could simply use six switches to control the digital value for the attenuator, one for each bit. In addition, design a separate PCB for the MCU you use, and put four 2x4 headers for upto 4 (=8 ch) relay PCB's. I mean people may also want to use their preferred MCU (PIC, AVR, 8051 etc.), and some already have existing MCU on their devices. |
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| digi01 |
thank you mhelin,your suggestions is very helpful to me.
sorry be so lazy to post,I have been busy with the graduation thesis recently.
here is the reed relays module lauout idea,It accept 6bit control message through the interface. |
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| digi01 |
| bottom layer,I have set up ground plate,do you think it can offset emc?or I should remove it? |
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| digi01 |
| quote: | Originally posted by mhelin
Regarding the use of relays, how much noise they keep when you adjust the volume? I was suggested that the reed relays also could be used and they were much less noisy. I mean the noise the relay contacts make, not the noise generated by the circuits (EMC). |
a little;) the relay that I used is omron PDIP.
Btw,even some ppl like listening to the sound that they contacts,say it is very cool:cool:
rgds
digi |
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| mhelin |
Does the reed relays have different pinout than regular ones (which reed relays pinout you used)? Yes, the noise may actually be nice until you'll get tired of it, or when listen to music at night, then it is not so nice. I'm not so sure about EMC and ground planes, I think that it it's good idea to use them, but the small "islands" should be avoided. The ground plane should be a single large area, so in your layout the ground plane areas under labels K1, K2, .. K5 should be removed. Also the plane should maybe cut off at right side (to avoid ground currents going two separate routes), the single resistor there could be grounded to the ground plane area at left.
Anyway, there are no high frequency signals, though the signal that comes from MCU may have EMC. So the return currents should come to the MCU ground, maybe these two ground planes (the one controlling the relays and the other is the audio ground plane) should be totally separate to ensure this. So the analog audio I/O connectors and R2R resistors should be on one plane and everything else (the "control" signals) on the other, just like with mixed digital stuff (here you don't have to interconnect the analog and digital ground planes at all which you have to do with the DACs). |
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| apollyon25 |
Hi,
Your layouts are good, however there are several issues with them that makes them prone to noise.
You have several large cuts in your 0V plane and these will cause antenna effects that will couple noise into your circuit.
Also, your traces are very thin and this will increase the trace inductance.
Your layout can be improved very easily by doing the following.
1) Re-place your components to improve route-ability.
2) Re-number your connectors to improve route-ability.
3) Make more effective use of the two layers.
4) Move signal traces to the top layer.
5) Remove the big long cuts in your 0V plane.
If you have to cut the plane, make the cuts have the smallest loop area possible, and the shortest length possible. If you can move the cuts to where there are no other traces then the loop-antenna-forming-cut doesnt affect the signals (other than the one causing the cut).
6) Remove unconnected copper.
7) Wherever possible make the 0V plane as complete as possible (no cuts, holes, slots, etc - except where absolutely necessary!)
Good luck
apollyon25 |
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| Evilsizer |
| any update on the vol. control? |
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| rabstg |
| quote: | Originally posted by Evilsizer
any update on the vol. control? |
Hey Zang-
Still a project in the works? |
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| DragonMaster |
| I know there are other relay - based vol. controls, but they're hard to find with the search engine. Is there one based on an ADC + 7seg drivers? Or a 7407 switched by resistors(These could get the voltage under .7v, so it doesn't switch on depending on the pot resistance) |
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| MCLL |
This is my Relay Volume |
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| rabstg |
Nice, can I get a picture of the whole circuit?
Do you have a schematic? |
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| Electro-Nick |
To MCCL,
How do you switch the relays ? All at once or do you use different times to switch the MSB or LSB ?
I can imagine that one relay is faster than the other so loud klicks would be possible ?
For my project i use the "port" command at once, but haven't tried it in the live situation yet.
Grtz
Nick |
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| jleaman |
| Looks really nice good work.. Wonder if my lcd that i have at home would work with this.. |
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| MCLL |
| quote: | Originally posted by rabstg
Nice, can I get a picture of the whole circuit?
Do you have a schematic? |
My Relay Volume Like This
But I use 89C2051 to control 8 x 12Vdc 2P2S Relay. |
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| MCLL |
| quote: | Originally posted by Electro-Nick
To MCCL,
How do you switch the relays ? All at once or do you use different times to switch the MSB or LSB ?
I can imagine that one relay is faster than the other so loud klicks would be possible ?
For my project i use the "port" command at once, but haven't tried it in the live situation yet.
Grtz
Nick |
It's so easy to switch the relays. Just change P1.0 - P1.7 (I use 89C2051) status from 1 to 0 or from 0 to 1. Using 8 Bit Binary Number like this
P1.0 P1.1 P1.2 P1.3 P1.4 P1.5 P1.6 P1.7 Present
0 0 0 0 0 0 0 0 0
0 0 0 0 0 0 0 1 1
0 0 0 0 0 0 1 0 2
No any klicks sound when I try to connect my amp, It's so good. |
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| jleaman |
| this is a 16 steped volume pot right ? |
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| MCLL |
| quote: | Originally posted by jleaman
Looks really nice good work.. Wonder if my lcd that i have at home would work with this.. |
I use standard 16x2 LCD Module and It should have Three Parts
1. 89C2051 Control Board
2. 16x2 LCD Module
3. 8 x 12Vdc 2P2S Relay Board
16x2 LCD Module Pin assignment
1 - GND
2 - V+
3 - Contrast
4 - RS
5 - R/W
6 - EN
7 - DB0
8 - DB1
9 - DB2
10 - DB3
11 - DB4
12 - DB5
13 - DB6
14 - DB7
15 - BL A
16 - BL K |
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| MCLL |
| quote: | Originally posted by jleaman
this is a 16 steped volume pot right ? |
In Theory, It should be 255 Steps Volume Pot ( 2 ^ 8 ). In Fact, I try to connect 6 x Relays, so 64 Steps Volume Pot ( 2 ^ 6). |
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| Electro-Nick |
| quote: | Originally posted by MCLL
It's so easy to switch the relays. Just change P1.0 - P1.7 (I use 89C2051) status from 1 to 0 or from 0 to 1. Using 8 Bit Binary Number like this
P1.0 P1.1 P1.2 P1.3 P1.4 P1.5 P1.6 P1.7 Present
0 0 0 0 0 0 0 0 0
0 0 0 0 0 0 0 1 1
0 0 0 0 0 0 1 0 2
No any klicks sound when I try to connect my amp, It's so good. |
Yes, i know that. But i wondered i you switched the whole 8-bit word at one, or bit-wise. So first P1.7 then P1.6 ; with a few msec's between the actual switching.
By the way the PCB looks very OKE :nod:
Grtz
Nick |
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| MCLL |
| quote: | Originally posted by Electro-Nick
Yes, i know that. But i wondered i you switched the whole 8-bit word at one, or bit-wise. So first P1.7 then P1.6 ; with a few msec's between the actual switching.
By the way the PCB looks very OKE :nod:
Grtz
Nick |
Hi Nick,
When I've build this relay volume pot, I guess It may have any klick sound or not enough linear. But I try to connect my amp, It's so good come out.
You are right. It's may be a few msec's between the actual switching when from 0 to 1 or from 1 to 0. |
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| jleaman |
| Is this up and running now. ? Do i have to program a pic ? I cant actually becaue i dont have a programmer.. Can i buy the chip and or a board from you ? |
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| digi01 |
| quote: | Originally posted by rabstg
Hey Zang-
Still a project in the works? |
Hi Troy,
I am sorry, but I was not active in the last weeks, as I had another project(BPA200kit) to do.I promise you,soon to reactivate my DVP(digital volume poti) project.
ZANG |
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| digi01 |
to MCLL,
great building!simple and utilitarian:)
ZANG |
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| Upupa Epops |
| This configuration have variable output impedace ( same as normal pot ), which is not good. Better is using of T or Pi pads. |
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| neutron7 |
nice work!
does that have a log law with those resistor values? or is that even possible.
if you want to use a pot instead of a encoder you could use a national DAC0808 chip. then you could use a log pot.
Upupa Epops can you explain T or Pi pads? i was trying to design something like this and the variable impedance was bothering me. |
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| Upupa Epops |
| What do you can explain ? Correct designed pad of this type have constant input and output impedance and by binary combination of them you can set up volume in very large value. Only you must maintain the same nominal driving and load impedance, which is not problem. |
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| digi01 |
| My friend,WQ is going to a la version,it is a simple DVP,128 steps mcu control without LCD and remot function. |
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| digi01 |
| quote: | Originally posted by neutron7
i was trying to design something like this and the variable impedance was bothering me. |
let it be:cool: R2R is easy to binary.and it's only need two kinds of resistors.the same solution is used by Mark Levinson. |
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| MCLL |
| quote: | Originally posted by digi01
My friend,WQ is going to a la version,it is a simple DVP,128 steps mcu control without LCD and remot function. |
It's great Outlook :) :) :)
I want to revise my relay volume board as follows :-
4 in 1 out
RC5 Remote
Mute
89S8252 MCU
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.
. |
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| seoman |
I have one question.
Does the volume adjustment have a delay?
the least significant relay most go creasy when turning the pot/encoder.
That relay will reach his switching life end, very soon.
Maybe a speed detection of the encoder can extend the life of the relay by locking the 2 least significant bits during fast rotation.
Just a thought
Regards Simon |
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| blu_line |
@Simon :D
| quote: | | Maybe a speed detection of the encoder can extend the life of the relay by locking the 2 least significant bits during fast rotation. |
Any idea how to do this ! I am most interested.
grtz
Simon |
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| seoman |
Hi Simon :)
Well I never tried programming a speed dependant enoder routine.
But without acces to the code it wil be very difficult I gues.
But measuring the time between 2 encoder pulses should give you the aproximate speed and with that value you can decide on the binary stepsize of bits to lock.
Regards,
Simon |
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| blu_line |
Then you need to :
1. detect, on irq basis as i do, which direction the turn is
2. Measure the time between 2 irq's
That is a challenge.
@Simon:
Have you seen the Dutch DIY announcement ?
grtz
Simon |
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| neutron7 |
i do not think wearing out the relay would be a problem, some of them are good for 500 million operations under low current conditions.
say it takes 1 second to turn the knob all the way. thats 256 on/off cycles per second. not exactly "high speed switching" and you would have to turn the knob almost 2 million times before it wore out. you might ger RSI before that :) (according to a quick calculation it would take 3 weeks of continuous knob turning)
if you only use 7 bit then it will last 2x longer |
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| seoman |
@ Simon
interrupt routine: (enconder pin change)
Stop counter
Read value of that counter
clear counter
start counter.
(clear interrupt flag)
interrupt routine: counter overflow
stop counter
counter value = max
(clear interrupt flag)
What is the challenge about that?
If counter value < XX
then highspeed = true
:)
@neutron
Maybe you have milions cycles relays.
But stil it would be nice to slow down those LSB relays.
Greetings, Simon |
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| neutron7 |
| you could also slow them down by using simple RC circuit on the relay drivers for the ones you want to slow down. especially for people not using programmable chip :) |
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| digi01 |
Hi seoman,
very useful question!thank you:)
| quote: | I have one question.
Does the volume adjustment have a delay?
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It will be ok.sure the pot has a imperceptible delay basis on relay's respond time,but it is a short delay.
| quote: |
the least significant relay most go creasy when turning the pot/encoder.That relay will reach his switching life end, very soon.
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We have set up a filter of program.the program will bypass the death area:D
| quote: |
Maybe a speed detection of the encoder can extend the life of the relay by locking the 2 least significant bits during fast rotation.
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There still have a filter.if thus(fast rotation),the poti will freeze up at the previous habitus;)
Zang |
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| digi01 |
P.S.| quote: |
Maybe a speed detection of the encoder can extend the life of the relay by locking the 2 least significant bits during fast rotation.
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There still have a filter.if thus(fast rotation),the poti will freeze up at the previous habitus till normal rotation.
I will let go 10 unit for you all to tryout.introductory price $30 plus air shipping.
please drop me a mial. first come first serve :)
unit specification:
including pre-program mcu and all parts,assembled completed.2mm thickness PCB board.
power supply,AC12V-AC20V
2 channel input / output,128 step switching
without LCD
option DC block
purpose for alternative traditional poti.
connection attached.
ZANG |
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| maxw |
How much is air shipping?
is it easy to add an LCD? |
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| apollyon25 |
Just a really simple idea but who says you have to actually increase the volume at the same rate as the incrementing of the encoder?
Use the code as was previously described.
but rather than updating for each increment of the control, have some deadtime or hysteresis in there to say "yes, Ive finished increasing the volume".
If you are even smarter you can calibrate the attenuation of the system and use a lcd to provide a indication of output volume control before the output is actually set to this level.
Alternatively you can use a traditional pot, an adc channel and use the adc value to set the relay R2R system...
Personally - Its all a bit of a hassle and I would never do this. Crosstalk, THD and noise is inherently increased over the values provided by an off the shelf 256bit digital volume IC.
Professionally - it poses several interesting problems...
Enjoy |
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| blu_line |
@apollyon25
| quote: | Use the code as was previously described.
but rather than updating for each increment of the control, have some deadtime or hysteresis in there to say "yes, Ive finished increasing the volume".
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As i understood; change volume settings (display) , not the relays. Wait for some time before the relays get the actual state (with some cosine slope).
I'd rather hear what i am doing than wait for it to blow my ears (when i/someone overturned the pot/encoder).
@Simon
Code is indeed rather simple. I'll hope i can try it soon.
grtz
Simon |
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| apollyon25 |
yes sort of.
you can update the relays for every single state change or ever second, or 3rd... its all just software and is trivial.
maybe wait x number of state changes before updating the relays (where x is some arbitrary number) and then after the level is left for some arbitrary time interval - update again...
you follow what I mean... |
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| apollyon25 |
maybe do a variable rate update based on the velocity of change...
update each bit for slow changes, but update only the top nibble for fast changes....
Just a few more thoughts... |
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| blu_line |
| quote: | | update each bit for slow changes, but update only the top nibble for fast changes.... |
nice idea
grtz
Simon |
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| digi01 |
to maxw,
the air shipping is $11.
the LCD is not available in this version.
P.S.
the unit include a rotary encoder,all resistors is 0.1% dale.
connections attached.
ZANG |
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| maxw |
| What impedance does the source see? |
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| digi01 |
| it is a 100K poti:) |
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| Evilsizer |
still any left?
any other updates to the other boards? |
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| maxw |
I have tested mine and it is great!
I haven't had the opportunity to test it out properly though, I just put it between my CDP and intergrated amp.
No noise in the signal when adjusting the volume and it has really fine adjustment, much more than I thought.
Good stuff Zang ;) |
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| DragonMaster |
for a 30 bucks initial price, what do you have apart from the PCB?(I haven't read the thread for a while)
relays?
other parts?
(You said that it doesn't have an LCD so I don't ask the question anymore)
is it a kit or it's pre-assembled?
| quote: |
I will let go 10 unit for you all to tryout.introductory price $30 plus air shipping. |
How much will it cost after that? (More or less?)
How do you change the volume? is it an encoder directly connected to the PCB, thru some serial conversion, or a real pot?
I hope I'll start building audio projects sometime . . .
(I just built a serial-MIDI interface + a parallel port LCD from a scheme and
I want to build :
a sub from the Shiva driver,
a PCM1703 DAC,
an analog VU,
maybe speakers + AMP.
And wow, I started restoring my tube amps!
That's the problem from being under 18 years old, I DO have the money, but no credit card so I have to ask my parents.) |
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| maxw |
| quote: | Originally posted by DragonMaster
for a 30 bucks initial price, what do you have apart from the PCB?(I haven't read the thread for a while)
relays?
other parts?
(You said that it doesn't have an LCD so I don't ask the question anymore)
is it a kit or it's pre-assembled?
|
Its all pre-assembled as above in my pic. You cant see the rotary encoder though.
| quote: | Originally posted by DragonMaster
How much will it cost after that? (More or less?)
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About $6 US for shipping IIRC| quote: | Originally posted by DragonMaster
How do you change the volume? is it an encoder directly connected to the PCB, thru some serial conversion, or a real pot?
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Yes its an encoder but it can be far away from the PCB via a cable (provided!)
I suggest you read through the thread if you want to know more ;) |
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| sek |
| quote: | Originally posted by DragonMaster
That's the problem from being under 18 years old, I DO have the money, but no credit card so I have to ask my parents.) |
Can we swap problems, please? :D |
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| DragonMaster |
| quote: | | quote: |
Originally posted by DragonMaster
How much will it cost after that? (More or less?) |
About $6 US for shipping IIRC |
I mean, the price it'll be when it'll not be the "initial 30$ price" anymore. (I ask because I don't know if there will still be units for sale)
| quote: | | I suggest you read through the thread if you want to know more |
Too much pages, and not enough dial-up time (60 hours for everybody including my 'lil sister)
| quote: | | Can we swap problems, please? |
Hehe. |
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| digi01 |
hi DragonMaster,thanks for your interest.I have sold all these unit.
| quote: | | How much will it cost after that? (More or less?) |
price $40 by air.I will make some more units when I have free time.
| quote: | | Yes its an encoder but it can be far away from the PCB via a cable (provided!) |
yes,and the cable need not shield.
thanls Maxw:)
I am going ahead to PGA2310 with remote control and LCD. |
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| MCLL |
| quote: | Originally posted by digi01
I am going ahead to PGA2310 with remote control and LCD. |
me too. I have plan to build a volume control using PGA2310 with remote control and LCD...
:) :) :) |
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| DragonMaster |
| quote: | | I am going ahead to PGA2310 with remote control and LCD. |
Why an LCD if there is only going to be 3 numbers on it?
A better idea would be a serial port to send data to a PIC that is aware of source etc. to display on the LCD,
or a 3x7-segment display with BCD to 7-seg drivers.
Also, I'm going to build this:
http://home1.stofanet.dk/hvaba/fprc5rx/
And I'd like to control the volume from there too. Could there be some inputs for an encoder and inputs for vol.+ and vol.-? |
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| neutron7 |
| what kind of relays are those everyone uses, DPDT relays are expensive on digikey. |
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| Evilsizer |
| quote: | Originally posted by digi01
I am going ahead to PGA2310 with remote control and LCD. |
keep up the good work digi. I want one of those pre's:smash:. if its like that one that you sent me the pic of a while back its going to be sharp looking. |
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| DragonMaster |
neutron7, it's preassembled. You just have to connect the input and output once you have it.
Just an other question :
Could there be an "expansion kit"(On request) possibility to have more channels?
(I know you can use the same resistor values + xPDT relays connected thru a buffer to the existing coil circuits, but it's better to use the same board design, and relays IMO)
Also, the DAC I talked about in an other post is not PCM??, it's TDA1541A. |
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| neutron7 |
| quote: | Originally posted by DragonMaster
neutron7, it's preassembled. You just have to connect the input and output once you have it.
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i know that. i just want to know where to get the DPDT relays for another project. |
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| digi01 |
| quote: | Originally posted by neutron7
what kind of relays are those everyone uses, DPDT relays are expensive on digikey. |
yes,same with mine.I buy them at local,the relay made in china.
| quote: | Originally posted by DragonMaster
Just an other question :
Could there be an "expansion kit"(On request) possibility to have more channels?
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I am considering...a multiple style is possibly.
| quote: | Originally posted by DragonMaster
Why an LCD if there is only going to be 3 numbers on it?
A better idea would be a serial port to send data to a PIC that is aware of source etc. to display on the LCD,
or a 3x7-segment display with BCD to 7-seg drivers.
Also, I'm going to build this:
http://home1.stofanet.dk/hvaba/fprc5rx/
And I'd like to control the volume from there too. Could there be some inputs for an encoder and inputs for vol.+ and vol.-? |
thank you DragonMaster for your ideas,the url looks interesting:)
for the 2310 pot,yes,it would be source display.there are three input port.
the attached is PGA2310&2311 archetype,my friend get oem remote control done.
thank you Evilsizer.
Z |
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| maxw |
| quote: | Originally posted by digi01
there are three input port. |
Only 3 inputs ?? :bawling: :bawling:
Double it :smash: |
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| ble0t |
| Are those custom made remotes? Do you have a link for that supplier? Thanks in advance ;) |
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| serosmaness |
Only 3 inputs ??
Double it
Could I use this with a dvd player that has discreet surround sound outputs and control the volume. |
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| DragonMaster |
What can I do if I don't want to use PGA2310 but FPRC5RX instead? That's because the FPRC5RX's functions can be fully customised.
(With this one, you can have up to 32 sources if using the serial output or 16 using direct PIC I/Os, it can be used as power, mute, volume control ;) and many other functions, as in my case, RF bypass for my RF modulator, or video sources toggle) |
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| digi01 |
| quote: | Originally posted by ble0t
Are those custom made remotes? Do you have a link for that supplier? Thanks in advance ;) |
Yes,custom made remotes.but that company has not offer online supply.
to maxw, serosmaness
the poi is designed for hifi system,I think three input(aux,cd,lp) is enough.
for AV system,any suggestions?thank you all.
| quote: | | (With this one, you can have up to 32 sources if using the serial output or 16 using direct PIC I/Os,it can be used as power, mute, volume control and many other functions, as in my case, RF bypass for my RF modulator, or video sources toggle) |
wow,matrix:cool: any infor about the FPRC5RX?
cheers
Z |
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| jleaman |
digi01 You got mail..
Also who is making these boards any one selling them id like 2.. |
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| DragonMaster |
Here's the link an other time, it explains about everything.
http://home1.stofanet.dk/hvaba/fprc5rx/
http://home1.stofanet.dk/hvaba/ is the homepage
For 16 sources, you just give it the Sony remote code you want(Custom ones if you want), and program every pins as radio buttons.
And it's pretty cheap also, you get a PIC with a few parts and pload the software.
http://www.users.bigpond.com/pbhandary/pic/IRSony.html
can be the remote. The only problem is to find a suitable case. (Maybe the ones on mouser with battery racks :) ). Or any universal remotes, the receiver could act as a standard Sony receiver. Then, you only have to build a small IR Xmitter for PC. |
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| digi01 |
| quote: | | Also who is making these boards any one selling them. |
the boards,pre assemblied unit is totally diy stuff for fun.they made by I and my friend WQ.we are not going to commercial,these units are diy only with small charge for ours work.
drop me a mail for service:)
Z |
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| maxw |
| quote: | Originally posted by digi01
the boards,pre assemblied unit is totally diy stuff for fun.they made by I and my friend WQ.we are not going to commercial,these units are diy only with small charge for ours work.
drop me a mail for service:)
Z |
Everyone want to know how much :D
So you may as well just post it here so you dont get 50 emails asking ;)
Can you post some pics of the screen working? |
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| jleaman |
| quote: | Originally posted by digi01
yes,same with mine.I buy them at local,the relay made in china.
I am considering...a multiple style is possibly.
thank you DragonMaster for your ideas,the url looks interesting:)
for the 2310 pot,yes,it would be source display.there are three input port.
the attached is PGA2310&2311 archetype,my friend get oem remote control done.
thank you Evilsizer.
Z |
Is this a kit your going to offer ? Id love to have a display with my volume on my pre amp, and remote : O ) can you email me so i can talk ? |
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| Coulomb |
| quote: | Originally posted by digi01
the boards,pre assemblied unit is totally diy stuff for fun.they made by I and my friend WQ.we are not going to commercial,these units are diy only with small charge for ours work.
drop me a mail for service:)
Z |
Hello Zang, got my Volume control today, looks good. Are you going to be offering the MCU version soon with Display, input select and remote?
Regards
Anthony |
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| maxw |
| yeah...and the PGA2310 kit? |
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| Coulomb |
| quote: | Originally posted by maxw
yeah...and the PGA2310 kit? |
Yeah that's the ticket... yeah... that's what I meant the PGA2310 kit... yeah that's it.
:) :) :)
Anthony |
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| jleaman |
Hello Zang, got my Volume control today, looks SUPER SUPER GOOD.!!
Thanks..
Keep up the good work.
Jason |
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