Tunnel diode astable (CB9250E)

This circuit was found in a 1967 General Electric documentation. The components are from that time. The tunnel diode is difficult to obtain today.

| Clique na imagem para ampliar |

Digitally controlled audio switch (CB12748E)
This circuit can serve as a basis for a digital mixer or simply for a noiseless switch of audio...
Microphone mixer (CB7988E)
This traditional mixer configuration with a high input impedance was found in a 90’s Popular...
1-transistor radio (CB20247E)
This medium wave radio works with any general purpose NPN transistor. The diode must be made of...