Adding a 3 prong plug to the Leslie 16. Possible?

[barryuhl]

Hello,

I have a Leslie Model 16 that I'd like to install a 3 prong plug in but it seems that the circuit has a floating ground(no connection to chassis). Is there any way to convert the floating circuit to a grounded one? I'm just worried about stray voltages being present when connected to a grounded guitar amplifier. Here are the schematics: http://music-electronics-forum.com/a...-leslie-16.gif

Any help would be much appreciated! I should also say, the reason I'm doing this is that I've built my own pedal to control the leslie and, for no good reason, I added a light to the pedal that would switch on and off with the on/off switch. The lamp has it's own power cord connected to the leslie, it's AC, but it's creating all kinds of issues once it's plugged into an amplifier. The leslie works fine without the light plugged in but when it is, it blows the fuse on the leslie side. The lamp line is completely isolated, as far as I know, from the guitar amp side but I have a feeling the floating ground vs. the actual ground on the amp is somehow causing a short. I should also state that the pedal is built exactly as shown in the schematics. The only thing I did was add a completely separate plug and cable to run power from the Leslie to the pedal. The power only touches one side of a footswitch and the lamp itself. On the leslie side, the power cable is attached exactly the same way the lamp in the schematic is connected. They are basically running in parallel but the new light should only come on when the pedal is switched on. Make sense?

[Wes]

I'm not sure what it is you are trying to accomplish, but, you should never mix and match AC from difference source outlets. Creating a "system" with two AC plugs (amp + lamp) is a recipe for blown fuses and/or parts. Remember, in North America we make 120 splitting 240 down the middle. If you connect two different 120s, they might add up to 240 on you, and THEN you'll be sorry.

Similarly, if you are not using keyed plugs or there is an outlet wired wrong (which happens all the time) you run the risk of creating a dead short and tripping your circuit breaker. Or setting your house on fire if you are really unlucky.

So, what exactly are you trying to do? Are you trying to turn a lamp on and off with your leslie pedal, while still having the leslie in use? If so, I recommend creating a completely isolated circuit for the lamp, which has a TRIAC in series with it. Then trigger the TRIAC with the Leslie pedal. Or use a relay in place of the TRIAC. Using an SCR will be even simpler but would cost you light brightness (and the ability to use CFLs).

Wes