Humidity Monitor (CB24940E)

Using a period sensor, this circuit was found in the February 1986 issue of Radio Electronics magazine. The sensor is a Philips of the period.

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Precision Crystal Calibrator CIR22334S CB21784E (CB21784E)
We found this circuit in a 1977 radio documentation. The circuit uses TTL frequency dividers from...
Three-Phase AC Motor Control (CB12540E)
In figure we have a three-phase AC motor control for voltages up to 600 V or 1200 V depending on...
Up to 500 kHz Oscillator (1 Transistor) (CB13137E)
The oscillator shown in the figure can generate signals up to 500 kHz and has good stability. Coil...