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 |

Logic Probe (CB10026E)
This circuit was found in old documentation but uses components that are still common. The circuit...
Voice operated transmitter (CB20412E)
This transmitter kicks in when the microphone picks up sound. This sound then modulates the signal...
Using LED on a Power Supply (CB4211E)
In the figure we have the way to connect an LED on the output of a power source to indicate the...