HP-35 Power Supply Waveforms

[cruff]

(04-09-2019 11:05 PM)albertofenini Wrote:  We have now good Vcc and Vss, very close to the desired values, but still Vgg about -15,6 V

Add a 15K ohm resistor from Vgg to ground and measure it again.

Is C7 in the circuit? Looks like Q1 is getting enough current to perform regulation now, but I'm surprised a bit about the ringing on that downward part of the waveform.