HP97 The journey begins

[Harald]

(05-05-2019 11:04 AM)Robert VM Wrote:  I may have misunderstood...
Aren't the different voltages meant to keep junctions (or FET equivalents) (reverse) polarised.
Operating from the same supply may get the device into all conducting and overheating?
Robert

I am not sure but I also would expect the two voltages are needed. What I meant is that they probably just don't need to be tightly regulated. So I would try the voltage doubler and a voltage regulator (or possibly just a voltage drop across diodes) to generate the lower voltage from the higher.