The guys at RICM have seen a problem with these supplies that if the output
cap is bad it won't start switching properly. It goes into a mode where it
acts as a linear regulator. As far as I remember they the a spice
simulation that also indicated this when the output cap had low
capacitance.
Do
On 2022-Jan-26, at 3:41 PM, Rob Jarratt via cctalk wrote:
> I am trying to test a couple of H745 regulators with a DC bench PSU and I am
> having some problems with testing them.
>
> My bench PSU is a twin unit so I can supply the +15V required as well as the
> "AC" input using 20VDC from the
Get yourself a largeish 24V transformer, I use an old 8A Stancor:
http://www.glitchwrks.com/images/dec/pdp1110_psu_repair/5411086_under_test.jpg
The AC input can be between 20-30V so it's not critical. Plenty of other
"control transformer" type units would do fine.
You shouldn't need a lot of
> -Original Message-
> From: W2HX
> Sent: 27 January 2022 00:11
> To: r...@jarratt.me.uk; Rob Jarratt ; General
> Discussion: On-Topic and Off-Topic Posts
> Subject: RE: Testing H745 Regulators
>
> Any chance you have a second supply you can parallel with the one you're
> using? Some
Any chance you have a second supply you can parallel with the one you're using?
Some bench supplies are dual supplies and have a parallel mode so you can
benefit from both sides of the supply and they can track the same voltage. Or
just put two supplies in parallel with the same voltage set on
I am trying to test a couple of H745 regulators with a DC bench PSU and I am
having some problems with testing them.
My bench PSU is a twin unit so I can supply the +15V required as well as the
"AC" input using 20VDC from the other half of the bench PSU. The problem is
that I don't think the
I think Datum was an Orange County, CA company mostly. They also did
tape formatters which were used with Pertec (also OC based for initial
time) to do NRZI and PE. I recall that they were similar to the Pertec
units, might have been related.
A friend worked for them on projects doing
> On Jan 26, 2022, at 1:28 PM, Tom Gardner via cctalk
> wrote:
>
> ...The UNISERVO I, of Univac I, tape drives had a separate spool of clear
> very thin film that was clock motor wound across the head when tape was
> moving, since the phosphor bronze plated tape was very abrasive. That
>
On Wed., Jan. 26, 2022, 16:47 Jonathan Stone via cctalk, <
cctalk@classiccmp.org> wrote:
>
> At the other end of the spectrum, the same seller had a lot of 4 microvax
> and VAXstation (BA213/215) systems which went on eBay for about $3000.
> Buyer paid air-freight to Scotland. I suspect they're a
> On Jan 24, 2022, at 10:27 PM, Gary Oliver via cctech
wrote:
>
>> ...
>
> As to the real reason I was doing this: Most of my tapes are un-boxed and
have suffered being in a dusty area (before I got them) with the dust
forming a sort of 'crust' on the outside of the tape. It's only on the
On Wednesday, January 26, 2022, 01:34:34 PM PST, devin davison via cctalk
wrote:
[...]
>Im looking to get some offers and see what i can expect to get for them. [...]
>
For comparison purposes, recycledgoods.com has listed a couple of BA213
chassis, still unsold, for at least 18 months.
I will need to get the details. I have some spare power supplies, tape
drives, and a couple hard drives, although im not sure if they are scsi or
dssi.
Im looking to get some offers and see what i can expect to get for them. I
might have put in too much in the first place when i bought them ,
The first system says no storage. Second system is unspecified.
A KA655 does not have onboard DSSI, so DSSI would be via KFQSA/M7769.
I've expressed interest in at least one system, tho shipping to California will
cost about as much as the hardware. On Wednesday, January 26, 2022,
It might help people decide if you mention which chassis, and boards these
include. I gather they don’t include Hard Drives? If they’re 3800’s, I
*assume* they would need DSSI drives?
Thankfully you’re amost as far from me as you could be, and still be in the US.
Thanks,
Zane
> On Jan 26,
Hello,
I had picked up these machines fresh out of high school. I actually worked
a deal with the buyer to make payments out of my paycheck for a few weeks
till they were paid in full. i have not had the time to focus and get them
running.
one machine i have had up to the cpu monitor, no
Hi!
I am the proud owner of a 3192G coax terminal.
As I have recently learned, there is an expansion module for the
terminal that allows you to attach a mouse and a IEEE-488 pen plotter to
the terminal. Some information about it can be found at [1] and [2].
I am searching for people who are in
Some years ago I was on a mission to rack mount all my computer and test
equipment. I found three front panels at a hamfest that I planned to use. I
never did anything with them but still have them. These are from Datum
systems, but they appear to be rather hard to find much information on.
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