- Posted by ARnut (A) on March 02, 2011 at 21:23:30
In Reply to: RE: IIRC posted by GP49 on February 28, 2011 at 21:23:51
Thanks for the posts. I looked at 'project 18' and it seems to be exactly what I am looking for. As I am not interested in center channel or subwoofer outputs, I guess I could simply disregard the second op-amp and its associated circuitry?
Also, can it be battery powered? If so, would the -15 v. go to ground?
Follow Ups:
- RE: IIRC - scarlett5689@att.net 17:32:33 03/03/11
(0)
- In Reply to: RE: IIRC posted by ARnut on March 02, 2011 at 21:23:30
In "project 18" Fig 3, you can omit parts R3, R4, R9, R10 VR1 and C1. With battery power, C2 and C3 need be only 100nF, connected close to socket pins 4 and 8.
You can't omit U3B as it is part of the dual op-amp U3. Best way to disable it is to connect pin 6 to pin7, pin 5 to ground, pin 7 floating.
Do NOT connect "-15V" to ground!! This really needs balanced + and - voltages - two 9 volt batteries should work well and give you a reasonable output. Total drain should be 7-10 mA, not too bad, but switch off both batteries when not in use!
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