This circuit was found in a 1999 publication. Its purpose is to flash two LEDs according to the sound of an equipment and to randomly flash three LEDs at a controlled frequency
This 9-bit DAC circuit was found in the RCA CMOS integrated circuits manual of the 1970s. The...
This circuit, found in an American publication from the 1970s, produces an audible tone in a...
This simple battery charger circuit was found in a Radio Electronics from June 1959. The resistors...