"Tyrotek" analog computer

[Scanning]

Brent,

I have a PDF of the schematic for the Heathkit EC-1 and / or there is a guy
on Ebay selling the Operations manual for $8.00 and free shipping ;
Item number - 120362320437

Best regards, Steven


> dwight elvey wrote:
> >
> > > From: hilpert at cs.ubc.ca
> > > There are a total of 10 amps. 4 can be configured as integrators or
summers, 4
> > > are just summers. 2 have associated circuitry to make them into
multipliers
> > > or dividers, or can be used as just summers.
> >
> > Hi
> >  It does sound like what was used as the basis for the Comdyna 10.
> > You might email the fellow at Comdyna and ask if he recognizes this
> > machine.
>
> Found the web page, and yes, it does seem similar in size and
functionality to
> the Comdyna GP-6 or 10. I'll follow up with him as you suggest.
>
>
> > > It's currently in a million pieces across 3 workbenches, almost ready
for
> > > reassembly. (Most of the nuts and screws and a few other metal parts
had grown
> > > that white powder that develops under certain conditions on some metal
> > > surfaces. I've seen it on other equipment, I presume it's an oxide of
the metal
> > > plating, although it also has the appearance of a mildew or fungus.
I'm not sure
> > > what element the plating is. Fortunately, it's only a 'mechanical'
issue, it isn't
> > > affecting the circuitry or contacts.)
> >
> >  Most likely zinc, lead or aluminum oxides. This is common for items
store
> > where they might have condensing moisture.
>
> In it's 'normal' form the plating has a flat white-grey appearance, no
blue or
> yellow tinge as one gets with other plates. To my observation it was used
> roughly from the late-30's/40s to the 60s/early-70's and then (thankfully)
> seems to have fallen out of favour.
>
>
> >  I've played some with them. A fun example is the bouncing ball example
> > from the EC-1 by heath kit. It will give you an idea of how one models
> > a physical system into the computer.
> >  Look at the configuration. There is a way to reduce the number of
> > op-amps needed by one ( I forget now ). It saves two free amps that
> > can be used to create a sine/cosine oscillator for the ball instead of
> > the 60 Hz one in the example. For use with a plotter, you don't want
> > the ball anyway, it is just fun on an oscilloscope but not needed
> > otherwise. A dot bounces just as nicely.
>
> .. have to see if one can still get the manual for the EC-1, re discussion
of a
> couple of weeks ago about access to Heath manuals being removed from the
web.