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-   -   ~14 VDC between chassis ground and signal ground... (http://www.diyaudio.com/forums/chip-amps/101314-14-vdc-between-chassis-ground-signal-ground.html)

StalfoS 5th May 2007 02:51 AM

~14 VDC between chassis ground and signal ground...
 
I built a power supply similar to this using two lm338 regulators. When I run just the PS, I get the correct voltages relative to ground, but when I attach my audiosector lm4780 board (parallel config) the voltages of +rail, ground, and -rail get skewed by 14 or so. If i connect the circuit common ground to the chassis i get blown fuses.

Does this sounds like a familiar problem to anyone? I have check my circuits over many times and everything seems correct. Any ideas?

AudioFreak 5th May 2007 08:47 AM

What voltage are your rails with nothing attached?

AndrewT 5th May 2007 08:55 AM

Hi,
I think you have a mis-wire somewhere.
Insert a mains light bulb in the mains supply to your PSU/amplifier. Then start measuring voltages without blowing fuses.

StalfoS 5th May 2007 08:26 PM

Quote:

Originally posted by AudioFreak
What voltage are your rails with nothing attached?
+/- 30VDC


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