Weslie - Sort of Leslie Simulator

[fx-fidden]

Hello, I found this project by General Guitar Gadget:
https://generalguitargadgets.com/effects-projects/modulationecho/weslie-modulator/

It's a kind of Leslie simulator, it's more a warble effect, but it's pretty unique and new to build.

Here's a demo:
https://www.youtube.com/watch?v=6R4fKmiO_jk

It seems to have a volume drop, maybe a booster after the circuit could be useful.

I tried to draw a veroboard layout (no boost).

That's it, unverified.



Tell me if I made some mistake.

Edit:
Now is VERIFIED.

[IvIark]

Nice one, thanks for sharing

[Atom Bomb]

Hi, thanks i used this layout and it works after these changes:

reverse D2
cut the track at C-10

if anyone doesn't know this already, the GGG circuit is a copy of this PAiA circuit that was published in popular electronics:

https://www.scribd.com/doc/258006767/Leslie-Effect-Simulator

except the GGG circuit uses newer transistors and a 3PDT switch instead of using a light bulb and an LDR for the bypass switch

[fx-fidden]

Great! I had totally forgotten this effect.

Thanks for verifying it.

[Neil mcNasty]

If you swap swap R21 and R22 (the trimpot) you will get exactly the same effect, but louder due to the trimpot/output now being moved closer to the transistor and the swapped resistor keeps it's relation to ground.
It should give the same result/same circuit, but will give a louder output level as the trimpot now has been moved closer to the source.
In other words: The audio output of the transistor comes from the emitter, meaning that moving it closer to the source makes the output signal slightly louder.

I hope that makes sense and can help solve any perceived volume drop.
In my mind it should work as a fix, but I have not built it yet (will very soon and then I will try my swap-mod)

Seems like back in the days they calibrated the circuits to unity level, but did it by measuring volts at the output rather than of listening to how it is perceived.
Hence they all sound like just below unity level.

[fx-fidden]

Thank you for sharing this information.
If you build it, let us know how it works. This isn’t at the top of my list, and I’m a bit slow when it comes to building pedals. My list is very long!