Crystal converter (CB7327E)

This circuit was found in a Popular Electronics from the 90's. The circuit can be used to convert signals to frequencies up to 25 MHz.

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Resistance Bridge (CB3911E)
This is a bridge for the measurement of low value resistances and high values too. The circuit...
Transistor breakdown (CB21393E)
This inverse transistor breakdown circuit was found in a 1967 documentation. It applies to modern...
Rectangular oscillator (CB10134E)
This conventional astable multivibrator circuit with operational amplifier can be found elsewhere on...