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 |

RF detector (CB11517E)
In fact, it is a RF field indicator with an operational amplifier equivalent to the 741. This...
Programmable Frequency Divider 1 to 9999 (CB419)
The input frequency of a signal applied to this circuit will be divided by one to 9999 in this...
Two-Tone Buzzer (CB24121E)
This unijunction buzzer configuration appears in this section from many publications and sources. The...