Ultrasonic repellent 555 (CB24911E)

This circuit includes the power supply from the power grid. We found it in Radio Electronics from July 1985. It can still be assembled easily today.

| Clique na imagem para ampliar |

High Voltage Status Indicator (CB13061E)
The circuit shown in the figure can be used as an indicator of presence and high voltage in a...
Light Controlled Relay (CB23751E)
This circuit uses the 2N626, the first commercial Darlington transistor. We found it in Radio...
Sawtooth generator (CB8884E)
This circuit can generate signals from 80 to 800 Hz with an amplitude of 0.3 V. We find it in a...