Sinusoidal peak detector (CB21519E)

This circuit for a frequency of 10 kHz was found in an Electronic Design. It makes use of a tunnel diode. The transistor admits equivalent.

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741 Fast Low Impedance Amplifier (CB13538E)
This circuit, from a 1973 publication, shows how to obtain a fast, low impedance output for a 741....
Home Alarm (CB17125E)
This circuit was found in a 1999 documentation, but the components it uses can still be easily...
50 to 150 MHz oscillator (CB9629E)
This overtone oscillator can generate signals up to 150 MHz. The crystal determines the frequency and...