Have been working on a crowbar circuit for my universal high voltage power supply for some time now.
And here is a early preview of the circuit. This unit is meant to bolt right on top of my 5kV 100uF filter capacitor.
As the picture shows I have cut a air gap into the PCB to strengthen the isolation between high an lo- voltage areas on the card.
Here is the schematics of the circuit. And I must emphasize, this circuit is not fully tested yet!!!
Hi Geir,
I just found your crowbar circuit here. I would very much like to know – if that is ok for you – how you calculated the required thyristor ratings and how much filter-C your crowbar supports. Would you be able to share a higher resolution photo of the circuit.
Vy 73 de Frank DG1SBG
Hi Frank,
I will relpy to you directly, but give me a couple of days.
73
Geir
LA6TPA