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Old 28th July 2004, 02:34 AM   #1
TheBat is offline TheBat  Philippines
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Default Newbie Q: Control volume of 5 amps

Warning, I'm a newbie



Hi,

I'm in the process of building 5 lm1875 amps (thanks to the tips of diyaudio members) for my dvd which has 5.1 output RCAs. My question now is how to control the volume of the 5 amps simulataneously. I figure that I could use 2 dual pots for the 2 front and the 2 rear channels, and a single pot for the center channel, totalling to three pots.

I've seen systems that have a master volume control, I was wondering how this can be done in my situation.

Thanks very much for any help...
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Old 29th July 2004, 09:11 AM   #2
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Take a look at Toshiba Electronic Volume ICs ( http://www.semicon.toshiba.co.jp/eng...io/analog.html ) or at Analog Devices SSM2160 6-Channel, Clickless Serial Input Balance/Master Volume ( http://www.analog.com/Analog_Root/pr...SM2160,00.html , THEY SEND FREE SAMPLES!!! ). I intend to use SSM2160 in my diy 5.1 amplifier.
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Old 29th July 2004, 01:51 PM   #3
SRMcGee is offline SRMcGee  United States
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DACT sells very high quality attenuators that might be of interest to you -- check out their website at www.dact.com. They have attenuator configurations of up to 6 deep, so your application should be no problem. Prices for DACT components tend to be pretty high, but I found an excellent low-priced source in the Netherlands: www.audiocomponents.nl.

Regards,
Scott
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Old 30th July 2004, 12:28 PM   #4
TheBat is offline TheBat  Philippines
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hi,

george: yes I just ordered samples. but they don't ship to my country. good thing my sister lives in new york and they ship there... the DIP version is obsolete though. only the smd version is available. but I will try it out first.

scott, thanks for the info. looks promising and they ship to my country.

thanks guys.
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Old 31st July 2004, 01:06 PM   #5
maxw is offline maxw  United Kingdom
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Quote:
Originally posted by TheBat
hi,

george: yes I just ordered samples. but they don't ship to my country. good thing my sister lives in new york and they ship there... the DIP version is obsolete though. only the smd version is available. but I will try it out first.

scott, thanks for the info. looks promising and they ship to my country.

thanks guys.
Aren't they controlled bt serial interfaces? doesn't that mean you need programmed PIC or similar to control it?
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Old 31st July 2004, 02:55 PM   #6
audioPT is offline audioPT  Portugal
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maxw, check this thread I started

One pot can control the number of amps you need.
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Old 31st July 2004, 03:24 PM   #7
air is offline air  Finland
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Maxim has also got digital potentiometers that can be ordered as samples Some of them can be controlled with up / down pushbuttons, and others with serial interface.

--> http://www.maxim-ic.com/solutions/au...cpk/11/pl_pk/0
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Old 31st July 2004, 11:07 PM   #8
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you could simply use 3 PGA2310 in parallel or better in daisy chain. They come in DIP, are made for high quality audio.

Simple controller on my homepage http://home.tu-clausthal.de/~tpa/PGA/index.html
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Old 1st August 2004, 10:06 PM   #9
audioPT is offline audioPT  Portugal
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Hi Till!

Can you teach us the basis of programming a PIC to control the PGA?

I've a lot of PGA2310 and some PIC's and don't know how to work with them.

Regards

Pedro Martins
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Old 1st August 2004, 10:09 PM   #10
audioPT is offline audioPT  Portugal
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Quote:
Originally posted by george88
THEY SEND FREE SAMPLES!!!


Don't forget the samples policy of the manufacturers!!
Don't abuse them!!
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