diyAudio Forums Archive > Top > Amplifiers > Chip Amps Newbie Q: Control volume of 5 amps - Click HERE for Original Thread TheBat Warning, I'm a newbie :D 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... george88 Take a look at Toshiba Electronic Volume ICs ( http://www.semicon.toshiba.co.jp/en...dio/analog.html ) or at Analog Devices SSM2160 6-Channel, Clickless Serial Input Balance/Master Volume ( http://www.analog.com/Analog_Root/p...SSM2160,00.html , THEY SEND FREE SAMPLES!!! ). I intend to use SSM2160 in my diy 5.1 amplifier. SRMcGee 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 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 good thing my sister lives in new york and they ship there...:D the DIP version is obsolete though. only the smd version is available. :xeye: but I will try it out first. scott, thanks for the info. looks promising and they ship to my country. thanks guys. maxw 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 good thing my sister lives in new york and they ship there...:D the DIP version is obsolete though. only the smd version is available. :xeye: 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? audioPT maxw, check this thread I started One pot can control the number of amps you need. air 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/a...scpk/11/pl_pk/0 till 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 audioPT 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 audioPT quote: Originally posted by george88 THEY SEND FREE SAMPLES!!! :att'n: :att'n: :att'n: Don't forget the samples policy of the manufacturers!! Don't abuse them!! till quote: 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. george88 PGA2310 or PGA4311 is a very good choice!!! Very low distorsion alow to cascade them. george88 quote: Originally posted by audioPT :att'n: :att'n: :att'n: Don't forget the samples policy of the manufacturers!! Don't abuse them!! Never! For my diy "sistems" samples are "Good Blessing"!!! audioPT ...I know this is a off topic, but, quote: Originally posted by george88 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... george88 I know. like Analog Devices and Maxim-Dallas. george88 To control serial devices i recomand you Atmel microcontrollers. Such AT89S53. Is chep an easy to programming. I have bad experinces with Microchip microcontrollers SPI interface.

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