The circuit shown is from Texas Instruments optoelectronics documentation. The input signal is audio and equivalent LEDs can be used. Other operational amplifiers can also be used.
Found in Motorola documentation from the 1980s, this circuit employs an integrated device from...
This simple regenerative receiver for the medium wave range is from a 1956 Sylvania publication. Details...
This bidirectional motor control was found in an 80's Electronic Engineering. The circuit uses a...