05-06-2023, 08:33 PM
A 20 M Ohm input DVM on volts (or a valve voltmeter) and a current limited capacitor leakage detector (mine has 2 x 1 MOhm in series and gives 400V no load.
The DVM reading is approximately the Avalanche voltage. I can select 1N4148 as known 100V+ regulators. It's non-destructive if current is low. Also good to check Vcb and Vce.
I suspect a diac can be replicated with two diodes or zeners depending on voltage. Low voltage is Zener action (reverse Vbe or lower voltage zeners). High voltage is Avalanche mode.
The DVM reading is approximately the Avalanche voltage. I can select 1N4148 as known 100V+ regulators. It's non-destructive if current is low. Also good to check Vcb and Vce.
I suspect a diac can be replicated with two diodes or zeners depending on voltage. Low voltage is Zener action (reverse Vbe or lower voltage zeners). High voltage is Avalanche mode.
