The circuit in the figure uses two operational amplifiers: an LM101A and an LM102. Diodes admit equivalents and resistors do not have to be accurate. The power supply must be symmetrical.
In this circuit a 12 V lamp or LED blinks with the music signal applied to the input. R depends on...
We found this circuit in a 1976 documentation. The circuit uses a double gate MOSFET. The circuit...
This circuit was found in an Electronic Design from the 90's. It makes use of components from the...