Question for SSLtech +/- 18, 48v split supply

[fum]

Hey there,

I'm hunting down a problem, and the symptom I have is that my 7918 (built a +/- 18V version of this circuit) is gettin smokin hot, to the point where it stops regulating. I slapped a heatsink on it, and it still gets really hot > 80C.

This is running a 312 like circuit.

The other regs are totally fonzi.

Thoughts on what types of things to look for?

Regards

ju

 

[bcarso]

Does anything else in the system get really hot?

With that much current you might be able to track down the source of the excess drain by using a good DVM and probing from the origin at the regulator to various points along the traces/wiring. Pick a spot near the origin/regulator but not right on it since the thermocouple voltages will interfere as the regulator heats up the trace.