Digital Volume Control

day1118 · 17th November 2008, 02:01 PM

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

n_dori · 17th November 2008, 03:57 PM

Try PGA2311

jan.didden · 17th November 2008, 04:11 PM

I've had very good results with a CS3318.

Jan Didden

day1118 · 17th November 2008, 09:37 PM

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

jaycee · 17th November 2008, 11:49 PM

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

BV · 18th November 2008, 06:24 AM

Solid State Volume controls

day1118 · 18th November 2008, 09:05 AM

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?

day1118 · 18th November 2008, 09:05 AM

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

BV · 18th November 2008, 09:09 AM

About price..
http://search.digikey.com/scripts/Dk...296-13113-5-ND

breez · 18th November 2008, 09:17 AM

If you go with PGA23xx or CS33xx, you can read some of my experiences here: PGA2311 power off transient

17th November 2008, 02:01 PM	#1
day1118 diyAudio Member Join Date: Oct 2008	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

17th November 2008, 04:11 PM	#3
jan.didden diyAudio Member Join Date: May 2002 Location: Great City of Turnhout, Belgium Blog Entries: 6	I've had very good results with a CS3318. Jan Didden __________________ /Yes! Its out: Linear Audio Vol 5! I'm not an "accademic", just a plodder who loves a challenge - Ian Hegglun

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17th November 2008, 03:57 PM	#2
n_dori diyAudio Member Join Date: Oct 2008 Location: Athens, Greece	Try PGA2311

17th November 2008, 09:37 PM	#4
day1118 diyAudio Member Join Date: Oct 2008	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

17th November 2008, 11:49 PM	#5
jaycee diyAudio Member Join Date: Apr 2004 Location: Norwich, UK	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

18th November 2008, 06:24 AM	#6
BV diyAudio Member Join Date: Sep 2005 Location: Trnava, Slovakia	Solid State Volume controls

18th November 2008, 09:05 AM	#7
day1118 diyAudio Member Join Date: Oct 2008	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?

18th November 2008, 09:09 AM	#9
BV diyAudio Member Join Date: Sep 2005 Location: Trnava, Slovakia	About price.. http://search.digikey.com/scripts/Dk...296-13113-5-ND

18th November 2008, 09:17 AM	#10
breez diyAudio Member Join Date: Jul 2004 Location: Finland	If you go with PGA23xx or CS33xx, you can read some of my experiences here: PGA2311 power off transient