This circuit that can be activated by light or heat was found in an old American documentation, but the components it uses are perfectly current. The power transistor shall be fitted with a heat sink.
This circuit can be used as a shield for sensors or analog circuits connected to the digital input...
Found in a 90s Popular Electronics, this transistorized circuit generates pulses from 2 Hz to 50...
This circuit was found in an old documentation, being able to generate signals of frequencies in...