This 1988 circuit makes a back-and-forth of LEDs whose speed is controlled by P1. All components used are common and the circuit can be powered by voltages from 6 to 9 V.
This circuit was found in an article in Radio Electronics magazine from May 1975. The circuit has...
We found this circuit in the February 1987 issue of Radio Electronics magazine. It is based on an...
This interesting circuit, which can be used as an alarm, was found in a 1997 documentation. It...