Circuit for 12vDC psu for turntable? - diyAudio
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Old 4th March 2011, 11:20 PM   #1
FNQ is offline FNQ  Australia
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Join Date: Feb 2010
Default Circuit for 12vDC psu for turntable?

Guys I need to replace a psu that steps down from 240V to 12vDC for a NAD turntable. Original was rated at 350Ma but was not a very high quality wallwart.
I would like to build something which is nicely regulated for the intended use.
I don't know of any suitable "generic" wallwarts regulated with the voltage/amp capacity combination.
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Old 5th March 2011, 12:40 PM   #2
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Join Date: Feb 2011
12V AC wallplug adapter, rated to something at least 500mA, a diode bridge, and a 7812 ic will do the stuff.
The IC should be connected like this :
Click the image to open in full size.

You can add some elco cap on the output side, say.. 2200 ufd, 16V, and a 15pf ceramic as far as i know never hurts.
Heatsinking may not be required, but you have to mount the IC on something anyways. Metal chassy parts are perfect. In that case You may want to electricaly insulate the IC from the metal.
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