Harmonic generator (CB8989E)

This circuit generates a 1296 MHz signal from 100 or 1,000 kHz crystals. We found it in an American documentation for radio amateurs.

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Ice Warning on the Track (CB6046E)
We found this circuit in an 80's Radio Electronics. The circuit uses a PTC sensor and an LED...
Rhytmic Lamp AC and 12 V (CB422)
In this circuit a 12 V lamp or LED blinks with the music signal applied to the input. R depends on...
Humidity Monitor (CB24940E)
Using a period sensor, this circuit was found in the February 1986 issue of Radio Electronics...