[sdiy] Music Easel ring mod analysis

[Aaron Lanterman]

On Nov 22, 2008, at 2:12 PM, Grant Richter wrote:

> A few days fooling on the breadboard and some fast Audiohm  
> optoisolators and you could come up with a FAR superior circuit.

Oh, very true... but I'm doing this more out of historical curiosity  
(particularly my Easel obsession), and also just to understand what  
the giants I'm standing on the shoulders of have done (need to figure  
out the state of the art before improving on the art), not to create  
the perfect ring mod. After all, you could forgo the optoisolators and  
just use an AD633 and be done - and I suspect that's what Buchla would  
do if he were making a modern Easel.

I do find myself wondering what's inside a 285e...

- Aaron