This 80's circuit uses a microcontroller programmed to generate various songs. The circuit can serve as the basis for a modern design, for example using Arduino. The old circuit included a small audio amplifier.
Found in an old Radio Electronics, this circuit applies to frequency meters for frequencies up to 100 MHz....
This circuit was found in the May 1989 issue of Radio Electronics magazine. The circuit requires a...
This stage of IF to 455 kHz operates with voltages from 1.5 V. We find it in a 90s Popular...