16 Dec
2001
16 Dec
'01
9:52 a.m.
On December 16, ajp166 wrote:
The older large ferrite core is easier to work with
though
much slower. The bigger cores produce a larger output
when they switch but the cycle times are in the
3-5uS range. The later is helpful for demos as nothing
is too fast.
I wonder if it would be possible (and practical) to use a
microcontroller, perhaps a PIC, to act as a core controller. Use the
A/D and D/A hardware to handle the drive and sense stuff, and do all
the timing in firmware...making it easily tweakable.
That would be something I'd be up for trying...if I can find a chunk
of core of low enough density to trace the wiring in. There are some
nice low-density planes on eBay right now, but they are priced WAY too
high in my opinion.
-Dave
--
Dave McGuire
St. Petersburg, FL "Less talk. More synthohol." --Lt. Worf
16 Dec
16 Dec
11:02 a.m.
I think the real problem is putting controlled amounts
of current through the wires. Because we probably
don't have specs for any of these, the amount of
current and time the current is on will have to be
determined by experimentation. Then, keep in mind that
the array is big so you have to make a lot of
identical circuits for an array of any size. Then, you
have to find the center of the "sweet spot" where at a
certain temperature, cycle speed, write current, cycle
speed, all of the cores work. I think this used to be
called a "schmoo" chart?
--- Dave McGuire <mcguire(a)neurotica.com> wrote:
On December 16, ajp166 wrote:
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The older large ferrite core is easier to work
with though
much slower. The bigger cores produce a larger
output
when they switch but the cycle times are in the
3-5uS range. The later is helpful for demos as
nothing
is too fast.
I wonder if it would be possible (and practical)
to use a
microcontroller, perhaps a PIC, to act as a core
controller. Use the
A/D and D/A hardware to handle the drive and sense
stuff, and do all
the timing in firmware...making it easily tweakable.
That would be something I'd be up for trying...if
I can find a chunk
of core of low enough density to trace the wiring
in. There are some
nice low-density planes on eBay right now, but they
are priced WAY too
high in my opinion.
-Dave
--
Dave McGuire
St. Petersburg, FL "Less talk. More
synthohol." --Lt. Worf 
12:39 p.m.
That would be something I'd be up for trying...if
I can find a chunk
of core of low enough density to trace the wiring in. There are some
nice low-density planes on eBay right now, but they are priced WAY too
high in my opinion.
$35 is a good number to stick by. The MIT swap meet semiregularly
offers various types at that number. A real small low dens one might
be better at $20 but even those often sit at 35.
eBay looks to me like $35 +- $15 most of the time.
John A.
8:25 p.m.
On Sun, Dec 16, 2001 at 10:52:27AM -0500, Dave McGuire wrote:
That would be something I'd be up for
trying...if I can find a chunk
of core of low enough density to trace the wiring in. There are some
nice low-density planes on eBay right now, but they are priced WAY too
high in my opinion.
-Dave
I've still got these two UNIBUS core planes (H215), but they're probably
better suited for use in a DEC system instead of being deconstructed.
Bill (will trade for ham radio equipment)
--
Bill Bradford
mrbill(a)mrbill.net
Austin, TX
8426
days inactive
8426
days old
3 comments
4 participants
participants (4)
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