13 Jan
2009
13 Jan
'09
1:59 a.m.
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
Found the web page, and yes, it does seem similar in size and functionality to
blue or
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. 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
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.
of a
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 couple of weeks ago about access to Heath manuals
being removed from the
web.