[sdiy] XR2206 and the new component I'm patenting.

[Batz Goodfortune]

Y-ellow All.
         OK. This XR2206 thing is killing me. What the hell is the control 
voltage supposed to be? Have you seen that graph of "R" vs output 
frequency? What the hell is that? It looks like it shoots up 3 and a half 
decades at about 90K. More details on that story later. But first.

Apparently I've invented a new component which should be patented. So get 
your investment dollars handy. Not content with inventing the light 
emitting resistor, I've now developed the fire emitting diode. There are 
just too many applications for such a component so I'll explain the 
procedure so you can all try this at home.

Take one very expensive 10 candela white LED. Forget the fact that you've 
got the PSU set across the + and - sides so that it's double the voltage 
you're reading on the meter. Set it to 3 volts. Put LED on test and marvel 
at how blindingly bright it is. Then marvel at how dark it gets suddenly. 
Then marvel at the orange glow inside the clear plastic lens. Now look very 
closely under a magnifying glass as a small sheet of flame shoots out the 
hole where one of the legs goes in.

Then as the embers of what once use to be silicon and phosphors die out 
like a dead camp fire, marvel at the pain in your fingers where the flame 
took a spot of skin off and the legs have melted themselves into them so 
you couldn't drop the thing if you wanted to. And you probably won't want 
to such is the marvel of the fire emitting diode.

And just when you think this is a use-once component, I managed to get the 
embers glowing again a few minutes later when I still couldn't believe what 
happened the first time.

Unfortunately, I don't have a digital camera which can focus that close on 
the remarkable charred remains. Nor did I have a video running. But I 
thought I'd share that with you in case such a device might be useful to 
you before the planned marketing date.

Alternative names are; the fire effect diode or the semiconductor igniter 
with 5 second pre-warning indicator. Or quite possibly the silicon 
uncontrolled rectifier.

I'm figuring it's something to do with the phosphors they use in these 
things that they should do this. Working something like a florescent lamp, 
they use the phosphors to turn a blue or UV LED white. Or white/blue/ish. 
So I'm guessing that what ever they used in there, when the thing gets too 
hot, it likes to burn. And I guess it released the pressure at the weakest 
point, which happened to be one of the holes where the legs go into the 
plastic. Someone might have other ideas and this might have been a freak 
event. But it's something to be mindful of perhaps.

Now back to the main story.
The problem with the frequency on the XR2206 is that I've rigged it up to 
use one of those vernier knobs like they used on the EMS VCS3s. I went to a 
lot of trouble to set this up and the front panel should not be modified 
further. The problem with this thing is that it only has a 180 degree 
rotation. As opposed to (whatever it is?) 270 degrees? of the pot's travel. 
The only pot I've got that will actually fit in the space is 5 meg. So 
given the nulling out of the travel and a couple of trim pots, I should 
still get a useful range out of it.

I do have one other pot small enough with the right shaft but it's only 
20K. I've seen a few circuits where they've used Voltage to current 
converters. VC current sinks. Not a problem to conjure up but a pain in the 
ass to set up like this.

I seem to recall reading where the control "voltage" is in a range of about 
3 volts on these suckers. From where to where I'm not sure off hand. But 
for a start, what I REALLY need to know is what they're trying to tell me 
in that graph. "R" vs Frequency. And is the frequency High then the 
resistor pulls toward negative or is it going low? (As I'd hope)

This is just a test oscillator. This is not something that has to be 
temperature compensated and 1v/oct or anything. I'm hoping not to get into 
the "Over-kill" business here. And what's with using a current sink?

Anyway, if someone has an intimate relationship with a 2206, I'd be most 
grateful.

Thanks in advance.

Be absolutely Icebox.

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