RF power meter (CB8977E)

This reflectometer or standing-wave ratio meter (SWR) was found in a 1980s American documentation. The diodes support general purpose equivalents.

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Neon Relay Control (CB21404E)
This circuit was found in an old neon lamp applications publication. The relay must be in...
Door buzzer or alarm (CB20492E)
This solar powered circuit was found in a 1991 documentation. The transistor is a general purpose...
Hartley Crystal Oscillator (CB19354E)
This circuit can be used with crystals from 100 kHz to 30 MHz and the resonant circuit must be...