Using a varactor or varicap, this 1969 Electronics World circuit has a modulation range from 75 kHz to 52 MHz. Modern equivalent components can be used.
Using 18 or 24 MHz crystals, this circuit is intended for producing reference signals with...
This circuit was obtained from a Linear Technology manual from the 1990s. The sensor is of the...
This circuit is from the manual of the used operational amplifier itself. The same setting can be...