Found in documentation from the 1980s, this circuit uses components from that time. The circuit is used in process control. The power supply is double.
This circuit was found in a 1967 Raytheon manual. The transistors are from the time. Equivalent modern...
This circuit was published in a 1979 magazine, but it can still be easily assembled as the...
The circuit presented generates short pulses. This configuration was found in a publication from...