[sdiy] analog innovation...

[Grant Richter]

>> A local junk dealer has littoe round 2" CRTs.
>> Oscilloscope module, anyone?
> 
> Electrostatic CRTs are MUCH easier to use. You can still get the
> old 1" CRTs, types 913, 1CP1, 1DP1 and 1EP1, at tube dealers.
> (Getting a bit costly, however...) They only require a 250v or so
> anode supply, not 1kV or more like most scope and viewfinder CRTs.
> VERY easy to apply.

The first version of the Mini-Wave was done in the 70's with an
oscilloscope. Also called a "flying spot scanner" you just put a photodiode
in front of a little oscilloscope and make non-linear transforms by painting
on 35mm slides.

DeVrys (sp?) Institute used to sell electronics courses and you built a
little 2" oscilloscope as part of the training. I repackaged the little
scope into a module that you slid 35mm slides into as an optical waveshaper.

It took another 25 years before it occurred to me that an ADC->EPROM->DAC
did the same thing, but much better. Doh!