Re: Modifications to 577 Curve Tracer Main Power Supply


 

...if the -30V does not exist, then the
reference diode is never turned on.
Addition: Strictly speaking, you *are* correct, of course. It's just that the - 30 V *does* exist without the regulation part being functional - or present. In fact, the voltage would probably try to go all the way to - 40 V. The regulation circuitry (mainly VR772, Q772 and Q786) *prevents* that by limiting to - 30 V.

Raymond

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