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simple sound to light

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sheldonstv

New Member
simple sound to light circuit designed as an add on for a dalek voice mod i built a while back....you can add a preamp before the line amp if you wish to amplify any audio signal from a microphone(electret etc)
circuit shows 3 leds but u can add more if you wish(within reason...) i used 4 hi brightness blue leds
 

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audioguru

Well-Known Member
Most Helpful Member
Hi Sheldon,
You have the pins of the opamp labelled backwards on the line amplifier:
Pin 2 is the inverting input.
pin 3 is the non-inverting input.
 

Chippie

Member
Hi Sheldon,
You have the pins of the opamp labelled backwards on the line amplifier:
Pin 2 is the inverting input.
pin 3 is the non-inverting input.
what a perfectionist...I guess living up to your reputation...:)
 

sheldonstv

New Member
that is exactly right they were reversed ive uploaded a replacement pdf file with the error corrected....gremlins must have swapped things round when i did that schematic...........
 

sheldonstv

New Member
another corrected pdf file uploaded definately got some gremlins......
 
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