This series LED circuit was found in the February 1992 issue of Radio Electronics magazine. The effect's speed is dependent on C1 and adjusted by R3.
Based on an LS3404 this circuit was found in the July 1990 issue of Radio Electronics magazine. |...
This circuit uses as a sensor a thermocouple to detect air flow. We found this circuit in a 1980s...
This RF signal meter has a switch position that allows calibration and comparison of low intensity...