Modifying Fulltone Mini Dejavibe

[boy howdy]

I have one of course. I have no complaints except that it goes way too fast at the toe end of the pedal. Robin Trower himself uses a freakin' block of wood for Christ's sake to keep it at the right speed! Half of the treadle's travel is completely useless - AND it's just way too sensitive to the movement of your foot. A small movement giveS a huge result!

I assume that this pedal exactly copies the original Univibe schematic, which I'm sure is available. Can anyone advise what component would narrow the speed range. I would gladly give up some low speed as well to get rid of the useless super fast speeds.

[PRR]

[boy howdy]

Thanks, Paul. But would this narrow the range of speeds or just slow it down? Too much slow would be about as bad as too much fast, I suspect.

[ElectricDruid]

No, it should make the range narrower.

Since those resistors are in series with the pot sections, it will make the lowest possible speed a bit slower, but going from 250+4.7K to 250+15K isn't much different, whereas at the high end, 4.7K is three times quicker than 15K. Even going all the way to 47K as Paul suggested is only turning 250K into 300K, which is about 20% slower, and that should reduce the top end by a factor of ten.

At least, that's my take on it without knowing the circuit closely.

HTH,
Tom

[boy howdy]

Thanks, Tom. I will have to get on that!