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Old 20th November 2003, 05:11 PM   #1
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Default How to control 6 inputs with 1 pot???

Hi everyone,

I have a DVD player that has 6 outputs...

1. Front Left
2. Front Right
3. Center
4. Surround Left
5. Surround Left
6. Surround Center

Now the question is, if I will build a 6 channel amp, how do I control the volume? What I want is to control the volume of the 6 channels with one control. Is it possible?

Regards,
JojoD
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Old 20th November 2003, 06:13 PM   #2
Did it Himself
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Use VCAs (Voltage Controlled Amplifiers) or digital potentiometer/volume control chips, slaved off one pot/volume control.
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Old 20th November 2003, 06:37 PM   #3
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Can you and others please point me to a circuit that uses vca for volumes. I also like the digital volume control but I don't know anything about digital electronics.

JojoD
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Old 20th November 2003, 07:07 PM   #4
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This is an interesting thread related to your question:

P1.7 / APOX completed

While this thread deals w/ a 2 channel implementation, others have done similar builds out to six channels.

The elusive APOX web site can be found here:

http://www.apoxcontrols.com/apox.htm

and the new site looks darned good too.
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Old 20th November 2003, 07:20 PM   #5
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Take a look at

http://www.dact.com/html/attenuators.html

They have a stepped attenuator that can control 6-channels at
once.

Another option is the APOX kit, as mentioned above. You may or may not want the added complexity, but it does sound great and is an awesome kit!
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Old 20th November 2003, 08:29 PM   #6
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Quote:
I also like the digital volume control but I don't know anything about digital electronics.
very cheap and simple, without all the display, balance, etc. options the apox kit has as advantage, i made this. Should be easy to use for 6 channels. http://home.tu-clausthal.de/~tpa/PGA/index.html
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Old 20th November 2003, 11:15 PM   #7
moamps is offline moamps  Croatia
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Quote:
Originally posted by JojoD818
Can you and others please point me to a circuit that uses vca for volumes.
Hi,
maybe TDA1524
Regards
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Old 21st November 2003, 09:23 AM   #8
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Try this
http://www.thatcorp.com/datashts.shtml
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Old 21st November 2003, 05:32 PM   #9
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I also wanted to do something like you are doing. I wanted to use a digital volume control or maybe one of those digital pots but they are not very linear so I drew this up one day when I was bored in class, tell me if it makes sense.
Attached Files
File Type: txt attenuator.txt (559 Bytes, 140 views)
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Old 22nd November 2003, 01:00 AM   #10
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I can't figure out the schematic...

Anyway, as for digital, aside for what you said, I don't like digital because I don't know a thing about it and can't implement such. AYour plan uses transistors, now that I can understand somehow.

Can you please redraw?

Thanks,
JojoD
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