Borrowing +/-15V from receiver for pre-amp - diyAudio
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Old 16th April 2009, 03:54 AM   #1
mattybe is offline mattybe  United States
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Default Borrowing +/-15V from receiver for pre-amp

I've been planning to build the Thorsten AA 2006 preamp, but couldn't figure out what to use for a power supply.

It occurred to me that maybe I can just take a tap off of my receiver. I have an AVR 7000. Looking at the schematics, it sure enough has a +/-15V supply powering its opamps.

If both op-amps in the pre-amp draw about 7.1 mA, does it seem reasonable to steal from here? Will I just add noise to the whole system along with the tap?

Alternatively, I could draw from a +/- 65V that's floating around, if I find a different regulator.

Any advice is much welcome.

-Matt
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Old 16th April 2009, 05:52 AM   #2
mattybe is offline mattybe  United States
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that is, Harman Kardon AVR 7000
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Old 16th April 2009, 07:09 AM   #3
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It will probably work. No harm in testing.
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