This circuit was found in Motorola's 1968 documentation. The SCRs are then replaceable with current equivalents. The lamp is 24 V according to the power supply.
This oscillator version is from an RCA documentation from the 1970s. Transistors support modern...
This emitter follower simulator circuit was obtained in a 1964 documentation. The circuit can be...
Varicap or varactor is the basic component used in this circuit of an American 80's documentation. The...