This PUT trigger circuit for SCR was found in 1967 General Electric documentation. The programmable unijunction transistor is not a very common component today.
This amplifier was found in a Japanese publication in 1972. Transistors are uncommon today, and...
The current of this source is 200 mA at the most, and the output depends on the zener that may...
Found in Mallory documentation from 1968 this circuit uses an integrated circuit from that time. The...