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.
This circuit is part of a synthesizer that was published in parts in several issues of Radio...
This symmetrical or dual source without regulation is indicated for the feeding of experimental projects...
Integrated LM108 and LM101A are used in this fast adder with low input current, figure. The...