Thanks for the replies guys,
As far as the voltage expected from the torch, it will range from a maximum of 0 VDC to a minimum of -300 VDC... or visa-versa, depending on how you want to look at...
Using an opto-coupler could make things simpler. A series resistor from the torch node to the LED, then to ground clamp node. You did not say what the function of your circuit is, and accuracy...mark_s Yesterday, 16:44
What is the range of voltage you expect from the torch? (-300 V +/-??)
1) What is the relay for? Is there some function you did not mention?
2) The inductors are not necessary.
3) You will need...
Long time, no post. Hope everyone is well. I'm sure hoping one of you brilliant minds can assist or critique an analog circuit I'm working on.
This circuit will scale the NEGATIVE dc...