Suggestions on a VCA and amp

day1118 · 6th October 2008, 03:04 PM

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!

sreten · 8th October 2008, 01:04 PM

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.

6th October 2008, 03:04 PM	#1
day1118 diyAudio Member Join Date: Oct 2008	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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8th October 2008, 01:04 PM	#2
sreten diyAudio Member 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.