I'm looking for a kit/pcb for a leslei effect

[joseluisrio@ono.com]

Surely nobody has developed a pcb for something similar to the rotosphere but something has to be

Someone knows?

[mth5044]

Maybe try the trivibe or a univibe?

[EBK]

Maybe the Vomit Comet?
https://www.diystompboxes.com/smfforum/index.php?topic=118670.msg1105395#msg1105395

[Mark Hammer]

Do you want something that really sounds like a Leslie, or are you satisfied with ramp-up/down connected to a phaser or flanger?  A more authentic Leslie sound will require a stereo out to provide some of the spatial swirl.

[Kevin Mitchell]

You might be better off putting your amp on a carousel 

The univibe was designed to replicate the leslie sound but ended up a creature in it's own right (and one of the first phaser circuits). The leslie is simply not a stationary effect but I could imagine a sort of phasing and flange sound that could get you close. So you might be better off looking into chorus pedals.

[Danich_ivanov]

Harmonic tremolo can do a decent leslie, look in that direction perhaps. There's no "leslie ready" circuit as far as i know. And if you think about it, what leslie essentially is (at least some of them work this way), is a crossover divided into 2 sections, one is low pass, another is high pass, when low pass speaker comes closer, high pass speaker appears further and vice versa, which is kind of what harmonic tremolo does only without a doppler effect, well there might be some, because filters affect the phase, but not a whole lot. Just of the top of my head i think that you can get doppler by also changing center crossover frequency, which is kind of what vibe/phaser does with it's moving notches. So harmonic tremolo, playing around with center frequency, might lead somewhere.