2-way intercom (CB23561E)

This circuit was found in Radio Electronics magazine from June 1958. The maximum distance depends on cable losses. More stations can be added.

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50 mW Amplifier (CB24449E)
This low-power transistorized amplifier was found in documentation from the 90s. The circuit uses...
Metal Detector (CB12077E)
This circuit is from Popular Electronics from March 1991. It can still be assembled with the...
Symmetric Power Supply (CB15712E)
The voltage of this symmetrical power supply depends on the regulating integrated circuits, which...