Short Wave Converter (T987E)

The conversion range of this circuit depends on the coil. The circuit uses two tubes, and the power supply is not provided.

Power grid voltage failure indicator (CB7013E)
Found in an 80's Elektor, this circuit can use any equivalent optical coupler. The buzzer is of the...
Electric fence (CB23675E)
This circuit with SCR and Unijunction and which can be assembled today with modern equivalents was found in a...
Intermittent Defects Detector (CB17230E)
This circuit was developed to find intermittent defects in an electrical control. In the event of a...