This circuit was found in 1980s Radio Electronics. The circuit includes the power supply. The ICL8038 circuit was very common at the time in this type of application.
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...