Phone noise canceler (CB9402E)

This circuit was found in a 1967 American documentation. The circuit uses components of the time, applying to analog lines.

| Clique na imagem para ampliar |

FET Tone Control (CB15843E)
This circuit, suggested by National Semiconductor, is a tone control (bass and treble) with high...
Transistor Amplifier (CB18859E)
This circuit from a Japanese publication in 1968 uses germanium transistors from the time like the...
FM transmitter (CB12125E)
This circuit is from a publication by Newton C. Braga in the United States. The transistor can be...