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I really know nothing about them but if opto-isolators are needed that tells me there are some lethal voltages around and therefore such a project is not for the green beginner!
Dave.
This is what it looks like inside:
And this pile is what I don't have:
There is a crossover in the cylindrical thing and a jack socket attached to the end of two cables for connecting amp to Leslie and then Leslie to regular cab. It's very inelegant and I don't particularly need the crossover or connection to another cab, and there was a socket that connects directly to the speaker, fitted into the back panel of the Leslie. There is a replacement available for the whole rig from HERE but I don't especially want to fork out 200-plus quid if there is a simple solution!
Here are the schematics that I have found for the Leslie/ Vibratone. Means nothing to me!
I have two Leslie 16s and I have yet to find the ideal speaker and amp. Lots of trial and error so far.
As for the speed control foot pedal, i'll send you some pictures of what's inside. It is a high current circuit so best done by a pro.
TBH I'm not sure I want to keep the Cab as it came into my possession more or less by default - I just use VST Leslie sims when recording but thought I might try the real thing seeing as I have it, but it only does fast at the moment, hence the inquiry about the speed control pedal.
*An Official Foo-Approved guitarist since Sept 2023.
That's a sneaky way of saying "give me lots of money".
So, what do I do? Use a neo ventilator v2. Incredible. Virtually identical to my Leslie 16 and a 100 other things on top.
Sell it to gassage and use the money on a neo.
In this style of Leslie cabinet, the switching is done by a relay that diverts mains to the slow or fast motors. The relay is mains powered and the footswitch switches the mains to energize the relay coil, thus you are switch mains on the footswitch, which is not ideal....
There are kits that allow you to use low voltage relays, and thus you will only have low voltage on your footswitch, however they are not cheap. eg Trek.
This is not a project for someone in experienced with high voltage wiring.
Incidentally no Leslie cabinet will conform to modern safety standards.
If you know what you are doing you can effect an inexpensive solution from off-the-shelf parts,.
Here's an emergency repair I did in a Leslie 122 (which uses a different switching mechanism) using parts from Maplins.
https://jpfamps.com/leslie-122-relay-repair/
It is also wise to replace the caps C5 and C6 in the Leslie unit. These are prone to shorting out and burning out the motor coil.
You should caps rated to take continuous mains voltage across them, eg Y2 caps.
Looks like it's going to be a long wait to get anything done. There's THIS THING on Ebay but I am a bit sceptical. It seems too simple!