We found this circuit in a 1986 documentation. It uses only LEDs, batteries, resistors and the power supply which can consist of 4 batteries or a 9V battery. The basic circuit uses two-color LEDs.
This car amplifier was found in the 1982 SGS Linear Integrated Circuits manual. The circuit can be...
This circuit was found in documentation from the 1950s. Note the low supply voltage. The circuit can...
Found in the June 1972 issue of Radio Electronics magazine, this circuit generates signals that...