Found in a 1969 documentation, this circuit is reset by a push button. The activation time is 100 us. The transistors are from the era.
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...