Yet another Volume controlers and source selections

Hi
I tested firmware today
One question I've got: why only +10db?
Datasheet says that +31.5db max should be.
Danzup, can you fix it please?
Thank you.

I have limited to +10dB because if you do the math when you have on input a CD-player which usually have over 2V on output you will have big distortion because you overshoot the analog power voltage on PGA ( the soft I am using in one of my preamplifier I have build I use limit to 0dB !!! because +10dB tend to be to much) .
But if you want I can rewrite again the soft to reach the 31.5dB !
( Are you sure you want that ? )
---------------------------
Later edit : I have done what you asked about , here is the soft.
 

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I have limited to +10dB because if you do the math when you have on input a CD-player which usually have over 2V on output you will have big distortion because you overshoot the analog power voltage on PGA ( the soft I am using in one of my preamplifier I have build I use limit to 0dB !!! because +10dB tend to be to much) .
But if you want I can rewrite again the soft to reach the 31.5dB !
( Are you sure you want that ? )
---------------------------
Later edit : I have done what you asked about , here is the soft.

Here is a proposition for pcb layout :
 

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Hi
I'm going to use passive preamp.
It means signal slackening by 10...20dB. That's why I want to control full PGA2310 dynamic range.
You were right when you said about CD-player with 2v output. 3 years ago I made DAC on CS8416&CS4391A for CD-ROM and I have 1.98v output on it. But in any time I can make volume lower.

Thank you danzup for PCB layout.
I already made my PCB.

Thank you again for the soft and for your help:)
 

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Hi again
There are some errors
Danzup, could you fix it please...

Error : 49 Line : 220 Value doesn't fit into BYTE [256] , in File : D:\...\PGA2310_1_6_D_31_5.BAS
Error : 49 Line : 223 Value doesn't fit into BYTE [256] , in File : D:\...\PGA2310_1_6_D_31_5.BAS
Error : 7 Line : 0 IF THEN expected [ 223] , in File :
Error : 123 Line : 0 END IF expected , in File :
 
Hi again
There are some errors
Danzup, could you fix it please...

Error : 49 Line : 220 Value doesn't fit into BYTE [256] , in File : D:\...\PGA2310_1_6_D_31_5.BAS
Error : 49 Line : 223 Value doesn't fit into BYTE [256] , in File : D:\...\PGA2310_1_6_D_31_5.BAS
Error : 7 Line : 0 IF THEN expected [ 223] , in File :
Error : 123 Line : 0 END IF expected , in File :
Sorry for error , here are the fixed files for firmware (including .bin ) :
 

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kit would be sweet!

As you read in this thread I have done by the years a lot of type of controller :
- volume with specialized IC like PGA 2310 , 2311 , 4311
- volume with alps potentiometer and motor (like blue velevet)
- volume with R/2R resistor attenuator (R/2R ladder )
- volume with shunt type attenuator
- volume with TDA7318 etc.

I have only kit for R/2R type volume/attenuator and for alps motor potentiometer .

For the rest I have posted schematics , pcb , firmware and I will provide support .
If in the future will be more than 10 request I will provide more kit.
It will be help if you say what kit would you like !
 
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Hi
Thank you danzup for soft - I compiled it with no error.
Perfect!
:)
I have a favour to ask of you to add last feature to this beautiful preamp controller - balance control.
Without balance control we have perfect device. But with balance control it will be brilliant!!!
Can you add this feature please?
In the future firmware I will add this feature .
Need some free time for now !
 
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Danzup,

Since I have no idea on which of this controler to pick, which one do you recommend if I want the best of your design? My needs is the one that can be used with universal remote, display and four inputs?
Since you have the r/2r kit, how much is the complete kit including shipping to U.S ? Where can I find the details of r/2r?

Thanks,

Joe
 
Danzup,
Since I have no idea on which of this controler to pick, which one do you recommend if I want the best of your design? My needs is the one that can be used with universal remote, display and four inputs?
Since you have the r/2r kit, how much is the complete kit including shipping to U.S ? Where can I find the details of r/2r?
Thanks,
Joe
On the first page project nr.3 :
http://www.diyaudio.com/forums/anal...ther-volume-controlers-source-selections.html
( price for : kit r/2r atmega16 / 4 input without transport to USA is 53 euro , please any other info in pm )
But if you do not like the fade and discrete mechanical sound of relay (this do not propagate to speakers ! ) this is not for you !
In path of audio signal there are only at max attenuation 6resitors and have the most transparent sound of a passive preamplifier .
 
Hi!

I,m building tube preamp FVP (Allen Wright) with 4 CCa Telefunken
tubes .I have Alps motor poti with controler ,but will also remote
sources.So I m intersted on your kit ,or only programed IC .I ,m
only analog guy and have no skills in digital el.I have some questions
1: is posible to progam 30 -40 sec delay function ( tube warm up)to operate relay for B+
2: analog to that function output mute -when B+ for tube is on
output is on -gnd on output is enabled.
3: duo led aded for status -warm up -red ,operate -blue

What is price for kit with that functions?

Thanks
voxac30
 
Hi!

I,m building tube preamp FVP (Allen Wright) with 4 CCa Telefunken
tubes .I have Alps motor poti with controler ,but will also remote
sources.So I m intersted on your kit ,or only programed IC .I ,m
only analog guy and have no skills in digital el.I have some questions
1: is posible to progam 30 -40 sec delay function ( tube warm up)to operate relay for B+
2: analog to that function output mute -when B+ for tube is on
output is on -gnd on output is enabled.
3: duo led aded for status -warm up -red ,operate -blue

What is price for kit with that functions?

Thanks
voxac30
Yes all of your idea are possible and already implemented in one of my tube amplifier !
On LCD it will appear : " Warming up tube !" U anodic is off and mute is on , and after 60 seconds it will say " Ready !" in this time mute will stay active and only after U anodic is connected the mute relay will be released .
If you do not want to use a LCD please tell and I will provide schematics for led only on front panel .
An atmel AVR programmed with firmware will cost you without transport 5 euro .
For kit : I have an kit with pcb etched on-house using toner transfer technique with 6 input to select , cost without transport : 50 euro (schematics and pcb posted here on first page
1. Volume controller / source selector for motor potentiometer ( like Alps blue velvet ) : )
 
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3. Control and audio source selection with relay and r2r volume
- volume with quality MELF resistors for r2r or shunt adjusting
- infrared remote control in the stop / start amplifier
- selection from 4 sources of signal relays
- display with 16 x 2 or 20x2 LCD
- switch and encoder for selections

Firmware for this project (the .bin and .hex files ready for programming the atmega16) .
You must also write 2 fusebits in atmega16 :
- Jtag disable
- Internal 8Mhz RC oscillator
 

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Schematic for RC5 controled passive preamp

Congratulation !
And Pryanick : I like those MLT resistors , give so sweet sound !

I will post some time soft and schematics with one atmega16 with r/2r 6 relay for volume and 7 relay for bass and 7 relay for treble controller (exactly like your but extended for 7 relay each tone control : bass and treble for 0dB in the middle and -5dB, -10dB ,-15dB and +5dB , +10dB , +15dB on both ).
It was made by me in year 2007 but never posted ....
here the schematics :
http://i31.tinypic.com/necfb5.jpg
 
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