Found in a Popular Elecronics from the 90s, this circuit appears in other versions in this section and on the website. The circuit draws one of 10 LEDs and has a sound effect produced during the draw.
This circuit is based entirely on SCRs. The circuit is from an American 80's documentation; and the PUTs...
This circuit is from 2002 documentation, requiring a symmetrical source of 6 to 12 V. The signal...
With the use of a microphone and an amplifier stage, this circuit does not require connection to...