Found in an Electronics World of 1969, this circuit causes a light bulb to flash along with the audio signal applied to the input. The circuit only works with incandescent lamps. C can be 47 nF to 220 nF.
This circuit was found in an Electronics Now from the 90's. The integrated regulator circuit and...
This circuit is suggested by National Semiconductor in its Linear Applications Handbook. It makes...
The circuit shown is from the 1993 Motorola Linear Interface ICs. The power source may be common...