Borrowing +/-15V from receiver for pre-amp

mattybe · 16th April 2009, 02:54 AM

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

mattybe · 16th April 2009, 04:52 AM

that is, Harman Kardon AVR 7000

peranders · 16th April 2009, 06:09 AM

It will probably work. No harm in testing.

16th April 2009, 02:54 AM	#1
mattybe diyAudio Member Join Date: Apr 2009	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

16th April 2009, 06:09 AM	#3
peranders Electrons are yellow and more is better! diyAudio Member Join Date: Apr 2002 Location: Göteborg, Sweden Blog Entries: 4	It will probably work. No harm in testing. __________________ /Per-Anders (my first name) or P-A as my friends call me

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16th April 2009, 04:52 AM	#2
mattybe diyAudio Member Join Date: Apr 2009	that is, Harman Kardon AVR 7000

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