Voltage to frequency converter (CB9449E)

This circuit was obtained from a 90s Radio Electronics. The components used are from that time. The FET admits equivalent.

| Clique na imagem para ampliar |

Synchronized switch (CB8253E)
Synchronized key. This circuit was found in a 1966 General Electric documentation. Modern...
Radio for headphones (CB21947E)
This small receiver uses CK722 transistors and was found in a documentation by Hugo Gernsback from...
Solar Cell Switched Regulator (CB1187E)
This circuit was found in a Popular Electronics from April 1993. It is a voltage regulator circuit...