Voltage reference (CB8466E)

Found in a 90s General Electric documentation, this circuit has a drain current of just 1.5 uA. The load current is 200 uA.

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...