This circuit was suggested by National Semiconductor in one of its manuals. The LM108 integrated circuit, uncommon nowadays, can be replaced by an equivalent. 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...