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Chip Amps Amplifiers based on integrated circuits

~14 VDC between chassis ground and signal ground...
~14 VDC between chassis ground and signal ground...
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Old 5th May 2007, 02:51 AM   #1
StalfoS is offline StalfoS  Canada
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Default ~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?
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Old 5th May 2007, 08:47 AM   #2
AudioFreak is offline AudioFreak  Australia
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~14 VDC between chassis ground and signal ground...
What voltage are your rails with nothing attached?
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Old 5th May 2007, 08:55 AM   #3
AndrewT is offline AndrewT  Scotland
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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.
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Old 5th May 2007, 08:26 PM   #4
StalfoS is offline StalfoS  Canada
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Quote:
Originally posted by AudioFreak
What voltage are your rails with nothing attached?
+/- 30VDC
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