[Help!] 4-channel volume control? - diyAudio
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Old 1st May 2012, 04:50 PM   #1
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Default [Help!] 4-channel volume control?

Hi, I'm currently designing a general-purpose 4-channel power amplifier for stereo bi-amp, stereo bridged-amp or quadraphonic home systems based on Cordell Audio's "The Super Gainclone" design with 40W output per channel.
My current solutions for controlling volume on the 4 channel simultaneously are:

1. a quad-potentiometer
Problem(s): I can't get one locally and don't have a bank account to buy online.

2. 4x Voltage-controlled Attenuators with a single CV
Problem(s): Haven't found a low distortion VCA circuit and don't know how to design one.

3. Digital stepped attenuators: digital pot. ICs, Multiplying DAC Attenuator, discrete ladder.
Problem(s): for digital pot. ICs: I don't like working with surface-mount packages, for Multiplying DAC: need to program a microcontroller for log response and rotary encoder, for discrete resistor ladder: too much work and still needs a micro controller.

I'm currently considering the VCA method, can anyone help me with the circuit?
Any other solutions?

Thanks.

Last edited by b1o2r3i4s5; 1st May 2012 at 04:54 PM.
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Old 1st May 2012, 05:32 PM   #2
boris81 is offline boris81  United States
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I did some research on the topic recently and found out that the PGA2311 chip is a very well regarded option for volume control. There are a few kits on eBay but I have no experience with them.

PGA2311 Volume Remote Control Preamplifier Kit + LCD | eBay
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Old 2nd May 2012, 01:32 AM   #3
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Thanks for the suggestion, the chip (PGA2311/10) has a DIP version and seems quite easy to interface with a micro controller. Unfortunately its not an affordable solution for me.
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Old 8th September 2012, 02:32 PM   #5
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Old 8th September 2012, 06:01 PM   #6
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Quote:
Originally Posted by b1o2r3i4s5 View Post
Hi, I'm currently designing a general-purpose 4-channel power amplifier for stereo bi-amp, stereo bridged-amp or quadraphonic home systems based on Cordell Audio's "The Super Gainclone" design with 40W output per channel.
My current solutions for controlling volume on the 4 channel simultaneously are:

1. a quad-potentiometer
Problem(s): I can't get one locally and don't have a bank account to buy online.
2. 4x Voltage-controlled Attenuators with a single CV
Problem(s): Haven't found a low distortion VCA circuit and don't know how to design one.

3. Digital stepped attenuators: digital pot. ICs, Multiplying DAC Attenuator, discrete ladder.
Problem(s): for digital pot. ICs: I don't like working with surface-mount packages, for Multiplying DAC: need to program a microcontroller for log response and rotary encoder, for discrete resistor ladder: too much work and still needs a micro controller.

I'm currently considering the VCA method, can anyone help me with the circuit?
Any other solutions?

Thanks.
Just pay in cash a friend or someone that you know and trust that has an account/credit card and He can order it for you.
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Old 9th September 2012, 07:39 AM   #7
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Sorry for bad english
I will try to gather all in one post.
Adjusts the tone, volume,
Remote control of RC 5
two inputs
memory installed in the OFF position

.
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Last edited by aszxcv; 9th September 2012 at 07:59 AM.
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Old 9th September 2012, 10:40 AM   #8
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Old 10th September 2012, 12:08 AM   #9
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Using a rotary encoder (the CUI ACZ16 (about $3)), a quadrature decoder IC (LFLS7184 by LSI/CSI (same price)) and 4 digital pots (Xicor X9134 or similar in dual or quad ($?)) will get you there cheaply! E

PS: Prof: Love the design (done that!), that is diy!, and the cat in the avatar!

Last edited by mickeymoose; 10th September 2012 at 12:12 AM.
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