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...
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...
Take a look at Toshiba Electronic Volume ICs ( http://www.semicon.toshiba.co.jp/eng/solution/audio/analog.html ) or at Analog Devices SSM2160 6-Channel, Clickless Serial Input Balance/Master Volume ( http://www.analog.com/Analog_Root/productPage/productHome/0,2121,SSM2160,00.html , THEY SEND FREE SAMPLES!!! ). I intend to use SSM2160 in my diy 5.1 amplifier.
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
Regards,
Scott
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 the DIP version is obsolete though.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.
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 the DIP version is obsolete though.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.
TheBat said: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?
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/audio_ics/parts.mvp/scpk/11/pl_pk/0
--> http://www.maxim-ic.com/solutions/audio_ics/parts.mvp/scpk/11/pl_pk/0
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
Simple controller on my homepage http://home.tu-clausthal.de/~tpa/PGA/index.html
george88 said:THEY SEND FREE SAMPLES!!!
Don't forget the samples policy of the manufacturers!!
Don't abuse them!!
Hi Till!
Can you teach us the basis of programming a PIC to control the PGA?
This was the pupose why i made the page linked above.
You need a programmer and download the MPASMWIN from microchip.com
You could start with the code i provided and try to get a PGA working,next modify the code and you will learn the programming by doing.
audioPT said:
Don't forget the samples policy of the manufacturers!!
Don't abuse them!!
Never! For my diy "sistems" samples are "Good Blessing"!!!
...I know this is a off topic, but,
That's because that I'm afraid
One day they stop with samples...
Because of some abuse, ON Semi charges you expedition taxes. This is an example...
A lot more of manufacturers stop sending samples...
george88 said:
Never! For my diy "sistems" samples are "Good Blessing"!!!
That's because that I'm afraid
One day they stop with samples...
Because of some abuse, ON Semi charges you expedition taxes. This is an example...
A lot more of manufacturers stop sending samples...
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