This circuit is from American documentation from the 70s. This configuration appears in this section obtained from other sources. The signal is sinusoidal determined in amplitude by D1 and D2.
Crystals from 100 kHz to 1 MHz can be used in this 1957 Raytheon circuit. 4 can have values...
Assembled with SMD components this circuit can be very small. The range is a few tens of meters. We...
This circuit can provide a voltage of up to 900 V depending on the input voltage. The diodes must...