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Old 6th October 2008, 03:04 PM   #1
day1118 is offline day1118  Australia
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Join Date: Oct 2008
Question Suggestions on a VCA and amp

Hi guys, I am reasonably new to audio electronics, and after some advice of how to set up a sound system the way I want.

The source will be a computer or ipod output.

I want electronic volume control of the sound, most likely feed from a computer -> D/A converter. I believe this is done through a VCA, correct? Can anyone suggest a good circuit for this?

I then need to feed it into a power amp, the room is about 4m * 4m, and doesnt have to be extremely loud, but that is always fun!
I am thinking about 60W. Would this be powerful enough?/ too powerful for the effort involved? Again, can anyone suggest a circuit? (I have looked on forums, but don't completely understand what is being said, so a bit unsure!)

Is there any other things I need? (Do I need a pre amp if feed is from an ipod?)

Thanks heaps, suggestions on anything would be much appreciated!
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Old 8th October 2008, 01:04 PM   #2
sreten is online now sreten  United Kingdom
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Join Date: Nov 2003
Location: Brighton UK
Hi,

A VCA is so old school analogue ...... and very difficult to do accurately.

2 x something like http://www.national.com/mpf/LM/LM1971.html

or 1 x http://www.national.com/ds/LM/LM1972.pdf

/sreten.
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