144 MHz Frequency Doubler (CB4675E)

This circuit is from an old American amateur radio manual. The circuit shows how to use a Varicap on a high power frequency doubler circuit.

| Clique na imagem para ampliar |

Pulsed CMOS Oscillator (CB413)
This circuit generates trains of pulses in regular intervals determined by R1 and C1. The...
Variable Sound UJT Siren (CB1483E)
This circuit was found in a 1977 Radio Shack documentation. The unijunction transistor can be...
Frequency modulator (CB4106E)
In the figure we show how to use a varicap to modulate a signal in frequency. The circuit can be...