This circuit uses an amplifier from National Semiconductor, uncommon nowadays. The numbers in parentheses are for the second channel. The circuit is suitable for old tape recorders.
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...