This circuit was found in a 1967 Delco Radio documentation. The circuit has an input voltage of 250 V and the load current is 2 A. The transistors used are from that time.
We found this circuit in a 1986 publication. However, as it is based entirely on 555 integrated...
We found this circuit in a Poptronics from 1998. The circuit can be extended to more competitors...
In this circuit a 12 V lamp or LED blinks with the music signal applied to the input. R depends on...