The ADC801 is not an easy component to obtain today, but the configuration is worth reference. The circuit is from National Semiconductor's Linear Applications Handbook.
This 80's circuit uses a microcontroller programmed to generate various songs. The circuit can serve...
The operating frequency of this oscillator, found in a technical documentation from Texas...
In the figure we have the way to control a TIC series triac with a reed relay. The current in the...