This 555 IC circuit was found in the November 1994 issue of Radio Electronics magazine. The circuit can be powered by voltages from 12 to 24 V.
This low power circuit was obtained from an American 80's documentation. The circuit indicates the...
This circuit can operate in a 100 dB range with signals of up to 100 MHz frequencies. Similar...
This circuit was found in a 1991’s PE Hobbyst Handbook. The circuit is based on altering the sound...