10 MHz counter (CB20128E)

This meter has a 0.001% tolerance and was found in an old American publication. The circuit has a selectable output.

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Busy Tone Generator (CB13937E)
This circuit generates the busy tone of ordinary telephones. The transistors can be the BC548 and...
Amplifier MC14546 (CB20041E)
This small 1 W amplifier uses a Motorola integrated circuit from the 1970s. The integrated circuit...
Crystal Oscillator 1 to 20 MHz (CB18932E)
This is a configuration widely used for oscillators with crystal from 1 to 20 MHz typically. The...