Leslie simulator

[tomg]

Hey, Doug

I built (DIYed) one of these and I one of those too (the 3900 one) long ago. 
Sorry, but they are pretty much a waist of time. You would do much better 
building one of my vc-bandpass (wah) filters and using a real lfo. If you have
a modular just use a bp-filter and lfo. The problem is the that the filters are
pretty lame...well...so are the lfos for that matter. Do you remember the BP
demo-wave? There was a short spot at the end that sounded much like a
Leslie....That was just a bpf and lfo.

Knowing that a Leslie is a 50W tube amp connected to a spinning motor- 
driven 2 way cabinet. HF-horn and 15" bin. A more interesting version would 
use hp & lp stereo panning filters and 2 motor simulator type lfos...meaning that 
it takes a while to reach speed and it slows down when turned off. One for 
panning and another for rate. I designed the lfos once, they are pretty cool. But 
I never finished the filter/vca things...You also need a nice fet overdrive to 
simulate the overdriven 50W tube amp.

Tom


> OK folks, here is the Leslie article:
> 
> www.angelfire.com/electronic/epeasant/circuits/circuits.html
> 
> This looks like a swept filter design as well, Harry, probably a precursor to
> the PAIA design you mentioned. I imagine you'll have a similar cynical comment
> on this one ;-)
> 
> BTW, if anybody actually builds any of this stuff, it would be nice to hear
> how it turns out. Thx.
> 
> Take care,
> Doug