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GB for R2R audio volume / input selection pcb

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#41
We are not going to sell full kits under 100 orders.
What we can offer, at this time, is pcb and atmega microcontroller ready mounted and programmed.

As soon wiĺl get a decent price from pcb manufacturer, will let you know the price of above.

Regards,
Tibi
 
#43
We have rearranged few components and now boards are ready for production.

Regards,
Tibi
 

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#44
We have factory price. 🙂
The price for PCB + programmed atmel will be 24euro.
This not include shipping which may vary from location to location.
If interested, please drop here a message and I´ll open the webshop on 7 June 12:00gmt.

Regards,
Tibi
 
#46
Interest to purchase

I'm interested at this price providing ship to UK is reasonable.
Please confirm that this price also now includes new buffer board.
ie I assume price is for all pcb's plus preprogrammed megachip all other components to be supplied by purchaser.
 
#47
Shipping to EU countries is 16euro with tracking and receive signature confirmation.
Standard postage to EU is ~10euro.

I confirm that the board include output buffer and atmega8 microcontroller programmed and soldered.
All other components will be available via an online BOM - click and shop - We'll do our best to provide codes from a single distributor TME, Mouser or Farnell.
Full documentation with detailed mounting will be available online and posted here as well.

Regards,
Tibi
 
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#52
The price only for PCB + programmed soldered Atmel Atmega16 will be 24euro.
Components as stated in BOM remain for everyone to buy from your favourite component online magazines : TME , Mouser or Farnell. .
This not include shipping which may vary from location to location.
If interested, please drop here a message and I´ll open the webshop on 7 June 12:00gmt.
See here for how it will look the pcb ( 90% will be like the old batch of pcb ):
http://www.diyaudio.com/forums/grou...volume-input-selection-pcb-5.html#post2199720
 
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#53
jleaman said:
will the end product look like this ?

An externally hosted image should be here but it was not working when we last tested it.


Price ? what does it include ?
Click to expand...

Or like this 🙂
So you´ll have to specify LED display or LCD.
In fact, on the webshop, you´ll have to choose between two products.
But beside display board, you´ll get relay board, rotary encoder board and buffer board.

Regards,
Tibi
 

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#54
danzup said:
The price only for PCB + programmed soldered Atmel Atmega16 will be 24euro.
Components as stated in BOM remain for everyone to buy from your favourite component online magazines : TME , Mouser or Farnell. .
This not include shipping which may vary from location to location.
If interested, please drop here a message and I´ll open the webshop on 7 June 12:00gmt.
See here for how it will look the pcb ( 90% will be like the old batch of pcb ):
http://www.diyaudio.com/forums/grou...volume-input-selection-pcb-5.html#post2199720
Click to expand...

I'm more interested in a complete kit ? Will you offer that ? I'm more interested in it, if there are 2 buttons for volume, one for up one for down ?
 
#55
Due the quality of the components, we like to offer, the total cost of the kit will be over chinese clones and we can not be competitive with low quality & cost chinese kits.
I think is more fair to have a BOM. You can choose components listed by us at the distributor price, or select what you consider is the best.

About 2 buttons for volume, if more people will request this, we can easily replace rotary encoder. However, I personally consider that is more elegant to have a rotary encoder, but final decision is yours.

Regards,
Tibi
 
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#58
bbp said:
Hi Tvicol, I recommentd 8bits or more relays uses in the volum e control, for the reason that 6bits is really not enough for a suitable attenuation.
You can get 48dB attenuation with 8bits relays
also, 36dB only in 6bits


regards
Lu
Click to expand...

Lu,

Strange ... We got around 63dB attenuation.
I hope we are talking about same volume controller. 🙄

Regards,
Tibi
 
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#59
tvicol said:
Lu,

Strange ... We got around 63dB attenuation.
I hope we are talking about same volume controller. 🙄

Regards,
Tibi
Click to expand...


That is really strange ^_^
We can only get X bits*6dB in original R-2R attenuator, here X is 8, so 6*6=36dB. in theory
But if the resistors are not only R and 2R in your attenuator, you can get other attenuation value.

here is a simple example:
6 bits R-2R resisotr network,
alll the switch are off you can get 'mute' in the output
one LSB switch are on, the others are off, you can get 20log*(1/64)=-36dB
two LSBs 20log*(2/64)=-31dB
three LSBs 20log*(3/64)=-26dB
four ... -24dB
......
63 LSBs 20log*(63/64)=-0.14dB

there are 1~63steps available in 6bits relays, but it is not mean that 0~63dB attenuations
no exception ^_^

maybe different resistor value is good to 6bits atteuator if you want to get more attenuation.


regards
Lu
 
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