This circuit can be used as an amplifier for musical instruments or even with your cell phone. The circuit is old and was found in the 1990 edition of Radio Electronics Experimenter magazine.
We found this circuit in the October 1978 issue of Radio Electronics magazine. The magazine...
This siren configuration using the 555 has already been explored in other circuits on this site. In...
VR can be from 50 to 220k it is recommended to connect a 100-ohm resistor in series. The lamp may...