This circuit uses common components at the time of its publication in the 1980s. The circuit can be made with modern equivalent transistors. The input signal is sinusoidal.
This PWM control circuit was found in an old documentation, but appears elsewhere on this site...
Found in the May 1988 issue of Radio Electronics magazine, this circuit is sensitive to small...
This circuit is intended to manipulate a transmitter (CW) from coded audio signals recorded on a...