2 band receiver ZN416 (CB21206E)

Found in documentation from the 1990s, this circuit uses an integrated radio from the time and has high impedance earphone listening.

| Clique na imagem para ampliar |

Electronic Voltmeter VM51 (CB18498E)
The circuit shown is a commercial electronic voltmeter sold in Japan in the 1960s. The circuit is fully...
80 MHz cascode amplifier (CB10065E)
This circuit was found in documentation from the 70s. We can try current JFET transistors....
10 MHz FSK Decoder (CB9677E)
This decoder for FSK modulated signals can operate at frequencies of 10.8 MHz. We find it in...