This circuit was originally intended to operate with a solar source for experiments. Transistors are general purpose, and the output current is relatively low.
This circuit can be used as an interface for resistance measurements on a common multimeter. With...
This filter for 100 Hz was found in a Radio Electronics of the 90s. The circuit uses a 741...
This circuit was found in Motorola's 1966 documentation. HEP556-type integrated circuits can be...