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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Regenerative receiver (CB22273E)
This simple 1 transistor circuit was found in an American documentation from the 60's. The...
Code practice oscillator (CB7314E)
Found in a magazine 73 for radio amateurs, this circuit makes use of general purpose transistors and...
Automatic Faucet (CB18147E)
The presented circuit allows to control the valve of a tap. The positioning of the emitter and the...