Busy Line Indicator (CB18711E)

This busy line indicator is very simple, serving for analog lines. The supply is made by two batteries and the transistors admit equivalents.

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Logarithmic Amplifier with Operational (CB13772E)
The circuit presented was found in a Motorola documentation from 19761, but it can be assembled with a...
Passive Mixer (CB824E)
This mixer uses only four passive component and can be used with high impedance sources. The input and...
Operational Bistable (CB15613E)
The configuration shown is a flip-flop that can be triggered by means of two push buttons normally...