This is an improved version of the previous circuit also found in the December 1990 Radio Electronics magazine. The duty cycle is also 50%.
This circuit appears with variations in other points of this section. This version is from...
This circuit was obtained from a 1970s RCA. The circuit uses LDRs as sensors. The resistors depend on the...
This circuit can be used with common drills connected to the 110 V network. With change of R1 and...