Saturday, July 2, 2016

Screaming Bird fix

I got my EH Screaming Bird pedal fixed today. Took some mucking around, developing a wiring diagram, testing... Jack Ormans LPB-1 schematic was the closest to the actual values in my Screaming Bird; the other common schematics used different transistors with  different values. 



Found some wiring photos of other LPB1 and Screaming Bird online and was able to deduce and test wiring through trial and error. 

Here was it in the testing stage, wiring here is wrong, but pretty close:


I had to replace a missing DPDT switch, which I found at Radio Shack a few weeks ago...nice that thy still carry parts!

Here was the final wiring diagram that worked, so I drew it up:


I think it's interesting that +9V runs to the Jack sleeve (traditionally ground!). The values in the diagram above are the actual ones I observed/measured. As in the other schematics I've seen, you could easily substitute the two caps for .002uF, or other more convenient values. 

Looks nice buttoned up, and sounds nice too!



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