Found in a Popular Electronics from the 90s, this circuit can be used as an electrifier. T1 can be an old TV fly back transformer or an ignition coil.
This fixed current source uses a Norton LM3900 amplifier. The maximum current depends on the...
This circuit was found in a 1973 publication. The SCR may be the TIC106 and must use a heat sink,...
This circuit was published in a 90s Radio Electronics. The circuit uses the well-known LM386 that...