HP-35 Power Supply Waveforms

[albertofenini]

This what we are doing (actually my son is doing this)
Is the basic block for the oscillator made with spare parts from old PSUs
the aim is to test on field the quality of each component and then transplant them in this
project Rebuilding an HP65 logic board from scratch
Over the weekend we should be able to add the diodes, the capacitors and the second transistor
and see how close we are in generating Vcc, Vgg, Vss from Vbatt
If we will succeed we will add ROMs and we will try to rebuild a CPU which was good but had
some loose pins ...
Will see and keep posting !
Still we have not found a replacemt for the 18154-0094 and in this prototoype an old genuine 1854-0550 has been used ..