Sensitive triac controller (CB7864E)

This circuit, which can be used as a shield, was found in a 90s Electronic Design. The circuit uses a diac and the transistor can be general-purpose.

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Geiger counter (CB11483E)
This is a very simple atomic radiation detector circuit using a Geiger-Muller tube. The circuit was...
Power Coupler (CB17561E)
With a 120 ohms resistor this circuit can also be used as a shield for 3.3 V output voltages. The...
Engine Control (CB18652E)
This is one of the many universal motor controls that the reader can find on this website. The...