Continuity tester (CB7386E)

This circuit was found in a Hands-On Electronics from the 90's. The FET can be any general purpose.

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Low Voltage Protector (CB4146E)
The circuit shown in the figure shuts off a load when the voltage drops below the value determined...
4093 Oscillator (MSB0125E)
This oscillator can run in frequencies up 10 MHz depending on the Power supply voltage. The 1 µF...
Differential Hold (CB5959E)
This circuit was obtained from an American technical manual from the 80's. The integrated circuit...