Photocell Pedal

Dave Seddon · Post by **Dave Seddon** » 20 Feb 2009 12:05 pm

Does anyone have a schematic for a photocell volume pedal, I thought I might have a go at building one but I can't find anything on the internet and current funds don't allow me to buy one. Any help would be greatly appreciated.
Cheers. Dave.

Stewart Campbell · Post by **Stewart Campbell** » 20 Feb 2009 4:09 pm

Hi Dave.
Over the years I have built three pedals using photocells with reasonable success, having said that they are tricky to set up and require a lot of patience unless you hit it lucky first time, I used two ORP12 photocells in a voltage divider arrangement, but you must place a buffer amp between the input and the divider to save the treble tone from being sucked. I have a circuit I drew up (if i can find it) you are welcome to it.
Stewart Campbell.

Dave Seddon · Post by **Dave Seddon** » 21 Feb 2009 12:07 am

Many thanks Stewart, I would very much appreciate a copy if you can find it. Cheers for now. Dave.

Stewart Campbell · Post by **Stewart Campbell** » 24 Feb 2009 6:11 am

Hi Dave.
I have located the circuit i drew up for the photocell pedal and if you can give me a few more days I will lay it out on A4 form along with some relavent notes, and if you let me have your email details I will send it asp. My contact is stewart@clancampbell.eclipse.co.uk

Stewart Campbell.