Remote Amplifier (CB23728E)

This two-microphone amplifier was found in a April 1961 Radio Electronics Magazine. The circuit is powered by battery and has a 600-ohm line output.

| Clique na imagem para ampliar |

Shaver adapter (CB9953E)
This circuit allows 220 / 240V shavers to be used in the 110V network. The diodes can be general...
Visual dialing indicator (CB9296E)
Used with telephones at the time, this circuit was found in Popular Electronics from the 90s. The...
Fast Logarithmic Converter (CB5104E)
This circuit was obtained from an American 80's documentation. It can be implemented with modern...