Dual Power Supply 15V

Posted on Nov 26, 2012

The 7915 (at least the `made in Morocco` I used) needs a small load (some mA) to work correctly. If you get funny voltages (-18.4V or so), put a resistor from the 7915 output to ground (2k2 works good). Or it might be a good idea to put the `power on` LED with a 1k5 resistor to the negative rail (take care of polarity!).

Dual Power Supply 15V
Click here to download the full size of the above Circuit.

Some brands of electrolytics have a small inductance which will cause the regulator ICs to oscillate. Use tantalum caps for C5/C6 to be sure (but also most normal electrolytics will work).

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