The main feature of this circuit found in an old American publication is that it is powered by the very signal it converts. The transistors are of the time and can be replaced by current types.
This circuit came out in a Popular Electronics from December 1995. It is a double T configuration that...
Found in a 1967 Electronic Design, this circuit can detect pulses as narrow as 0.2 us. Active...
This is the basic configuration of a Colpitts LC oscillator using a CMOS gate. ...