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 |

Dual Limit Comparator (CB5085E)
This configuration was found in a 1990s documentation. Modern operational amplifiers can be used...
Radio Sentinel 369P (CB18440E)
This is the diagram of the AM Sentinel 369 transistor radio obtained in a Japanese documentation from the...
Limit comparator (CB9591E)
This is the traditional configuration for a limit comparator or window comparator, using two...