455kHz Oscillator (CB21137E)

This oscillator uses a small IF transformer taken from an old transistor radio. FET admits equivalents. The circuit can be used to calibrate radios.

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20 mA Current Source (CB13423E)
This source of constant current was obtained in an American documentation of 1973. The transistors can be...
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When light fails to focus on the sensor, a common photo-transistor, the relay closes its contacts....
Analog Multiplexer (CB21250E)
This low impedance circuit was found in an Electronic Design from the 90's. Operational amplifiers admit...