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Old 17th November 2008, 03:01 PM   #1
day1118 is offline day1118  Australia
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Default Digital Volume Control

Hi Guys, I want to make a reasonably simple digitally controlled volume control. I was looking at a VCA, but the chip I intended on using (SSM2164) is no longer avaliable, and im no longer sure that a VCA is the best option for Hi Fi systems.

*Just to fill in the background - I have buit a prototpye amp, and now want to make the volume control to ensure it all works as wanted before moving on. Music source will be an ipod/computer, and there will be between 4 - 6 rooms, each with two amps and seperate volume control.

Can someone please suggest a circuit for the volume control? I have used pic chips before, and will use one to control the volume (with a digital - analog converter if need be!)

Thanks
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Old 17th November 2008, 04:57 PM   #2
n_dori is offline n_dori  Albania
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Try PGA2311
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Old 17th November 2008, 05:11 PM   #3
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I've had very good results with a CS3318.

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Old 17th November 2008, 10:37 PM   #4
day1118 is offline day1118  Australia
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Thanks for your replies!

The PGA2311 looks like it is the right thing for the job, has anyone used this or have any idea of how well it works?

For power supplies, I would have used a spare computer power supply to generate the +/- 5v (analog) but where do I get +5v digital from?

Also, if anyone has used this, can they please discribe what they used as a controller?

Thanks
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Old 18th November 2008, 12:49 AM   #5
jaycee is offline jaycee  United Kingdom
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Use either PGA2310 or PGA2320 - these use +/- 15v analog supplies which is pretty standard, and what you will be using if you have further opamps in your circuit.

Do not use any switch mode PSU in a preamp - the noise will be dreadful. Use a simple linear PSU, using LM317/337 will do. 5V for digital use should be a seperate regulator (7805 will do) and preferably a seperate transformer.

Programming the PGA chip is over a 3-wire serial bus. This is quite simple from any microcontroller. I would recommend Atmel AVR micro's personally but if you have used PIC, stick with that
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Old 18th November 2008, 07:24 AM   #6
BV is online now BV  Slovakia
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Solid State Volume controls
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Old 18th November 2008, 10:05 AM   #7
day1118 is offline day1118  Australia
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Thanks, I had a look at the 2310 vs 2320, and the only difference i can notice is the supply voltage. 2310 is 5V and 2320 is 15V. Is there any other difference or advantages?
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Old 18th November 2008, 10:05 AM   #8
day1118 is offline day1118  Australia
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Also, thePGA2310 is $45 per chip which only controls two mono feeds! Is there another way? The SSM2164 controlled 4 lines, and only cost $15! However this chip is now discontinued! What is the best approch?

Thanks
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Old 18th November 2008, 10:09 AM   #9
BV is online now BV  Slovakia
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About price..
http://search.digikey.com/scripts/Dk...296-13113-5-ND
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Old 18th November 2008, 10:17 AM   #10
breez is offline breez  Finland
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If you go with PGA23xx or CS33xx, you can read some of my experiences here: PGA2311 power off transient
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