This is a low-gain amplifier to operate as a booster. We found it in an American documentation from 1947. The circuit uses a coupling transformer at the input.
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...