This circuit makes use of a specific 80's component and was found in an American manual of the time. A matrix keyboard allows you to select one of several music programs.
We found this simple shortwave receiver in an Electronics Now from the 1990s. Details of the coil...
This circuit is from 1990 documentation. When we press D1 the lamp remains on for a time interval that...
The circuit shown in figure 1 serves to control a servo motor with a current of up to 200 mA. The...