Heterodyne Mixer (CB4291E)

This is a typical 80's FM radio mixer circuit. The circuit was found in a documentation of the time.

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Pierce Oscillator (CB25680E)
This version of the Pierce oscillator with the 2N3904 was found in the January 1994 issue of...
Constant Current Source (NI011E)
This circuit sources a Constant current to a load. The current is determined by R2. In the...
Geiger counter (CB11483E)
This is a very simple atomic radiation detector circuit using a Geiger-Muller tube. The circuit was...