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 amplifier for signals in the 70 MHz band was found in an old English documentation. The...
This circuit was found in the December 1992 Radio Electronics magazine. Range depends on optical...
Found in a September 1992 Radio Electronics magazine article, this circuit generates a pulse as...