Unijunction Triac Control (CB25861E)

This power control circuit was found in an article in the June 1995 Electronis Now magazine. The circuit makes use of a trigger transformer.

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Transistor Audio Oscillator (CB12375E)
This circuit is from a 1974 publication, but it can still be easily assembled today with BC548...
Air Pressure Change Sensor (CB6528E)
Found on Popular Electronics in the 1980s, this circuit detects a change in air pressure using a...
Audio step for earphone (CB20560E)
This 3-transistor amplifier stage was found in documentation from 1963. The transistors are made...