This TTL circuit was found in an American documentation from the 80s. The components are common in the series and the supply must be made with a voltage of 5 V.
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...