This circuit was obtained from an American documentation from the 1970s. Information on the current obtained and the winding of the transformer is not given.
This transmitter kicks in when the microphone picks up sound. This sound then modulates the signal...
This simple logic test circuit with 3 LEDs was found in October 1985 Radio Electronics magazine. The...
This circuit uses one of the first commercial transistors, availble in 1958, year of the...