Indicated for automotive use, this circuit was found in a Popular Electronics from the 90s. The circuit uses a power transistor that must be equipped with a heatsink.
Found in a 90s Radio Electronics, this circuit uses a ceramic capacitor (C1) as a sensor. The...
This CW transmitter for the 3,5 MHz band, low power, was published in a march 1961 Radio...
Light falling on the transistor changes both the mark and the space of the generated signal thanks to the...