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 is a typical circuit of a PROM programmer from the 70s. It appeared in the magazine Radio...
This circuit is intended to switch two signals of different frequencies that appear at the output....
This rectangular signal generator was found in an Electronics World of 1966. The transistors are...