Found in documentation two years 80, this toy instrument uses an integrated circuit little commonly. As notes are given the values of key series resistors on the keyboard.
Found in a magazine 73 for radio amateurs of the 90s, this circuit shows how to supply a photo...
This circuit was found in the 1991 Electronics Experimenters handbook. It can be used to display RGB...
This sinusoidal oscillator was found in Radio Electronics in 1989. It uses a 741, but other...