Sensitive Crowbar (CB5887E)

This circuit is from an 80's documentation, firing when the input voltage exceeds 5 V. The SCR can be the TIC106 need not have a heatsink.

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10 to 84 MHz Colpitts oscillator (CB4052E)
This Colpitts crystal oscillator was found in an American publication for amateurs in the 1980s....
Sensor Darlington Touch (MSB060)
Two transistors connected in direct engagement, so that the first emitter is connected to the base of...
Negative Voltage Generator (CB25844E)
This very low power circuit is based on the ICL7860. We found it in an Electronics Now from April...