This circuit was found in the March 1980 issue of Radio Electronics magazine. It is based on the newly released LH2400. The circuit must be powered by a symmetrical power supply.
Instead of the lamps, LEDs can be used in series with 470 ohm resistors. The circuit is from an...
This interesting configuration was found in a 1965s Electronic Design. It makes use of components of...
This circuit was found in a 1967s Motorola documentation. The circuit regulates the voltage of an...