1 Simple Sound to Light Converter Circuit

This simple circuit is used to convert sound to light. It is connected in parallel to speaker and it will blink and jive with the output sounds.
schematic diagram
NPN transistor pinout
Part List:
R1 - 390 kilo ohms 1/4W
R2 - 120 kilo ohms 1/4W
POT1 - 10 kilo ohms poetentiometer
C1 - 2.2uF electrolytic capacitor rated 16V
Q1 - 2N2222, 9013 or similar NPN transistor
NEON - any small neon lamp 


  1. what if i replace a LED with neon lamp ?