Suggested by a 1965 Electronic Design, this circuit was originally proposed for oscilloscope operation, but can be used with other instrument types.
This circuit produces a warning signal with the programmed current that can reach 4 A. The circuit is...
Found in an old American documentation this FM modulator makes use of a varactor diode. The...
This circuit was obtained in Motorola documentation from 1969. The transistors are from the time...