ROTOSONIC II

[TIMBO]

Hi guys, I've got an even poorermans Leslie, as this one is only a single speed.

I did some searches to see if it could have a speed control added, but nothing that I could under stand

[bigsbybender]

Original 2 speed Leslies have actually 2 motors, fast and slow. The modern Leslies use just the "Fast" motor but use a "Pulse" circuit that provides AC in pulses so the motor cannot achieve full speed, the kits to convert Leslies to do that are rather expensive. https://bborgan.com/hamptone-mk1c-motor-control.html

[Willabe]

The modern Leslies use just the "Fast" motor but use a "Pulse" circuit that provides AC in pulses so the motor cannot achieve full speed......

Ahhhhh........    interesting.


                  Brad     

[TIMBO]

Hi guys, The SS amp side of this build http://el34world.com/Forum/index.php?topic=17531.0 has past the sound check.
The use of the 50w module is so much quieter than the old stuff.

Just need to sort out a power supply for the 12v relays. I was hoping to use the +15v for the EQ and add a dropping resistor to get around 12v. Can this be done. Thanks

[TIMBO]

Hi guys, I been having a few problems sorting out the electrics for the switching and power supplies. So things are a bit slow on the construction side.

[TIMBO]

Hi guys, How time flies.
With some distractions out of the way and the wait for parts, the end is here for the "ROLASONIC VIBRATO"

I'll get some sound clips ASAP.

[stingray_65]

WOW!


I've always knew something like this was possible, but never got around to searching out how one would use one of those leslie units.


I think I have 3  maybe 4 of those leslie units in storage


I have a larger one with a wooden rotor that used to be a 2 speed that i put a PWM controller and motor on it to make it a fully variable speed.


I harvested them from old organs and I used the swell pedal to vary the speed.


never mounted it in a cab or anything.


I think I know what my next project is going to look like!


This is so cool!


Ray

[TIMBO]

Hey stingray, I look at those variable speed controls but the cost is a killer and I didn't find much in a DIY unit. Can you elaborate on the PWM. Thanks

[SILVERGUN]

Nice work TIMBO!!   

Here's a little reading on PWM, as it applies to DC motors:
http://www.electronics-tutorials.ws/blog/pulse-width-modulation.html

Here's an example of a schematic that we use for a wire feeder to control wire speed in a welding machine, just to give you an idea of how the circuit looks.

If I was gonna try it I'd just cheat and steal the control board and motor out of an old feeder. 

[TIMBO]

 

[TIMBO]

Hi guys, Sound clip here.http://el34world.com/Forum/index.php?topic=18409.new#new