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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Simple Timer 555 (CB19025E)
This timer was found in the Texas Instruments 1996 linear applications manual. The relay must be...
Photoelectric comparator (CB7508E)
This circuit compares two light intensities, providing the indication on an analog instrument. The...
Transistor Voltmeter (CB16238E)
This circuit was obtained in a 1983 publication. It is a 1-transistor voltmeter, capable of...