On Thu, Dec 9, 2021 at 12:26 PM Rob Jarratt wrote:
>
> Hello Tony,
>
> > The power bricks draw very little current with no load on the output and
> > 2.5A
> > would be fine to power one up.
>
>
> Are you saying that I can test them with no load? I thought they would need
> some load?
I'm pretty
Hello Tony,
> The power bricks draw very little current with no load on the output and 2.5A
> would be fine to power one up.
Are you saying that I can test them with no load? I thought they would need
some load?
>
> Most, if not all, of the power bricks start by rectifying and smoothing the
On Wed, Dec 8, 2021 at 9:58 PM Rob Jarratt via cctalk
wrote:
> > I have a variac rated at 2.5A. I am not quite sure whether that would be
> > sufficient to test the bricks individually. Otherwise, I guess one of these
> > would do the trick https://cpc.farnell.com/block/steu250-48/transformer-
>
> On 12/08/2021 5:14 PM Rob Jarratt wrote:
>
>
> The problem is that it isn't marked with a wattage, just a current, which
> left me wondering at what voltage. Although Will Cooke's response seems to be
> that the voltage doesn't matter, so at 240VAC it would be 600W. Can that be
> right?
?
-Original Message-
From: cctalk On Behalf Of Mike Katz via cctalk
Sent: Wednesday, December 8, 2021 5:58 PM
To: General Discussion: On-Topic and Off-Topic Posts ;
wrco...@wrcooke.net
Subject: Re: PDP-11/70 Boards
More accurately up to it's rated wattage "Power = Voltage * Current&
> -Original Message-
> From: cctalk On Behalf Of Mike Katz via
> cctalk
> Sent: 08 December 2021 22:58
> To: General Discussion: On-Topic and Off-Topic Posts
> ; wrco...@wrcooke.net
> Subject: Re: PDP-11/70 Boards
>
> More accurately up to it's rated wa
l Discussion: On-Topic and Off-Topic Posts ;
> wrco...@wrcooke.net
> Subject: Re: PDP-11/70 Boards
>
> More accurately up to it's rated wattage "Power = Voltage * Current"
> after all.
>
> If you have a 100W max variac you can draw 20A @ 5V (approx) but only 1A
Off-Topic Posts ;
wrco...@wrcooke.net
Subject: Re: PDP-11/70 Boards
More accurately up to it's rated wattage "Power = Voltage * Current"
after all.
If you have a 100W max variac you can draw 20A @ 5V (approx) but only 1A at
100V.
On 12/8/2021 4:44 PM, Mike Katz via cctalk
More accurately up to it's rated wattage "Power = Voltage * Current"
after all.
If you have a 100W max variac you can draw 20A @ 5V (approx) but only 1A
at 100V.
On 12/8/2021 4:44 PM, Mike Katz via cctalk wrote:
"As a general rule, a variable transformer (Variac) can provide full
rated curre
"As a general rule, a variable transformer (Variac) can provide full
rated current at any output voltage. So a 2.5A unit can provide 2.5 A at
1V, 10V, 120V, etc. With a 20V output, that is 50 VA (Watts, sort of)."
Up to the current rating of the variac. When you draw more current than
the tra
> On 12/08/2021 3:58 PM Rob Jarratt via cctalk wrote:
> So, to supply the bricks on the bench, would a variac rated at 2.5A be OK? I
> am not sure I know how much current the bricks will draw at 20VAC, and at
> what voltage the 2.5A rating is given. Otherwise, would this do the trick?
> htt
> > -Original Message-
> > From: cctalk On Behalf Of Jay Jaeger
> > via cctalk
> > Sent: 05 December 2021 14:51
> > To: cctalk@classiccmp.org
> > Subject: Re: PDP-11/70 Boards
> >
> > On 12/5/2021 3:37 AM, Rob Jarratt via cctalk wrote
> On Dec 5, 2021, at 1:37 AM, Rob Jarratt wrote:
> I don't see the Kunkin unit for sale except for a couple of items on ebay
> from China. I am really reluctant to buy anything at all from China. I
> couldn't find a manufacturer site for them, and I was wondering if there are
> alternatives s
> On 12/5/2021 3:37 AM, Rob Jarratt via cctalk wrote:
> Thanks for the tips. The transformer that drives the bricks is a real beast.
> Did you find an alternative more convenient way to power them on the bench?
No, I just used the big transformer, since I needed to bench and disassemble
the H74
> -Original Message-
> From: cctalk On Behalf Of Jay Jaeger via
> cctalk
> Sent: 05 December 2021 14:51
> To: cctalk@classiccmp.org
> Subject: Re: PDP-11/70 Boards
>
> On 12/5/2021 3:37 AM, Rob Jarratt via cctalk wrote:
>
> > Thanks for the tips. The t
On 12/5/2021 3:37 AM, Rob Jarratt via cctalk wrote:
Thanks for the tips. The transformer that drives the bricks is a real beast.
Did you find an alternative more convenient way to power them on the bench?
From the schematics, some of them seem to want 20-30 VAC (some, like at
least one of t
On 12/4/2021 5:57 PM, Rob Jarratt wrote:
What kind of load tester are you looking to buy? I have an 11/45 which I need
to test the power supplies on too.
Oh just one off of amazon, I expect. One could either get a nice one in
a cabinet at all for around $280 - $350, depending upon capac
k.co.uk/product/rigol-dl3021-programmable-dc-electronic-load/
Thanks
Rob
> -Original Message-
> From: cctalk On Behalf Of Fritz Mueller via
> cctalk
> Sent: 05 December 2021 01:03
> To: General Discussion: On-Topic and Off-Topic Posts
>
> Subject: Re: PDP-11/70 Boards
On 12/4/21 7:02 PM, Fritz Mueller via cctalk wrote:
On Dec 4, 2021, at 3:57 PM, Rob Jarratt via cctalk
wrote:
What kind of load tester are you looking to buy? I have an 11/45 which I need
to test the power supplies on too.
My experience with an 11/45 (serial # 343) was that the
regulators
> On Dec 4, 2021, at 3:57 PM, Rob Jarratt via cctalk
> wrote:
> What kind of load tester are you looking to buy? I have an 11/45 which I need
> to test the power supplies on too.
I picked up a Kunkin KP184 this last year, and it does nicely for testing those
brick regulators and the power c
> -Original Message-
> From: cctalk On Behalf Of Jay Jaeger via
> cctalk
> Sent: 04 December 2021 23:21
> To: cctalk@classiccmp.org
> Subject: Re: PDP-11/70 Boards
>
> On 12/1/2021 11:55 AM, Noel Chiappa via cctalk wrote:
> > > From the blog of
On 12/1/2021 11:55 AM, Noel Chiappa via cctalk wrote:
> From the blog of someone who got a KB11-A working
It's Fritz Mueller's blog; at about the top of this page:
https://fritzm.github.io/category/pdp-116.html
he's just turned the machine on for the first time, and you can
follow as h
> From: Guy Sotomayor
> I don't unfortunately have any light masks
Dave Bridgham and I were manoeuvreing to be able to produce clones of the one
you loaned me (he has access to a computer-controlled milling machine at his
maker-space or whatever the name is for them now, and we bought a g
> From the blog of someone who got a KB11-A working
It's Fritz Mueller's blog; at about the top of this page:
https://fritzm.github.io/category/pdp-116.html
he's just turned the machine on for the first time, and you can
follow as he chases, finds and fixes CPU problems. The KB11-C/D
of th
On Tuesday, November 30, 2021, 04:24:37 PM EST, Jay Jaeger via cctalk
wrote: >
>
>Did you use that directly with ExpressPCB and order from ExpressPCB or
>did you convert to more standard gerbers?
I have a gerber archive for the km11x.pcb file. If anyone can host it where it
might be more
On 11/30/2021 4:42 PM, Fritz Mueller via cctalk wrote:
I built mine from a layout on Tom Uban’s site:
http://www.ubanproductions.com/museum.html
Did you use that directly with ExpressPCB and order from ExpressPCB or did you
convert to more standard gerbers?
I just went with ExpressPCB for mini
On 11/30/2021 6:31 PM, Paul Koning wrote:
On Nov 30, 2021, at 7:17 PM, Jay Jaeger via cctalk
wrote:
...
The issue is (I think) that the ExpressPCB software can only be used to create
files to order boards from them - or can it now export ordinary gerbers?
(Otherwise, to go with another f
> On Nov 30, 2021, at 7:17 PM, Jay Jaeger via cctalk
> wrote:
> The issue is (I think) that the ExpressPCB software can only be used to
> create files to order boards from them
> On Nov 30, 2021, at 4:31 PM, Paul Koning via cctalk
> wrote:
> You're right, they say so in the FAQ. And it is
> On Nov 30, 2021, at 7:17 PM, Jay Jaeger via cctalk
> wrote:
>
> ...
> The issue is (I think) that the ExpressPCB software can only be used to
> create files to order boards from them - or can it now export ordinary
> gerbers? (Otherwise, to go with another fab. I presumably would re-ente
On 11/30/2021 3:52 PM, Henk Gooijen via cctalk wrote:
Van: Fritz Mueller via cctalk<mailto:cctalk@classiccmp.org>
Verzonden: dinsdag 30 november 2021 22:43
Aan: General Discussion: On-Topic and Off-Topic
Posts<mailto:cctalk@classiccmp.org>
Onderwerp: Re: PDP-11/70 Boards
I built
Van: Henk Gooijen via cctalk<mailto:cctalk@classiccmp.org>
Verzonden: dinsdag 30 november 2021 22:52
Aan: General Discussion: On-Topic and Off-Topic
Posts<mailto:cctalk@classiccmp.org>
Onderwerp: RE: PDP-11/70 Boards
Van: Fritz Mueller via cctalk<mailto:cctalk@classiccmp.org>
Van: Fritz Mueller via cctalk<mailto:cctalk@classiccmp.org>
Verzonden: dinsdag 30 november 2021 22:43
Aan: General Discussion: On-Topic and Off-Topic
Posts<mailto:cctalk@classiccmp.org>
Onderwerp: Re: PDP-11/70 Boards
> I built mine from a layout on Tom Uban’
> I built mine from a layout on Tom Uban’s site:
> http://www.ubanproductions.com/museum.html
> Did you use that directly with ExpressPCB and order from ExpressPCB or did
> you convert to more standard gerbers?
I just went with ExpressPCB for minimal hassle, but you could probably get it
ch
On 11/30/2021 2:04 PM, Fritz Mueller via cctalk wrote:
On 11/30/21 10:06 AM, Noel Chiappa via cctalk wrote:
From the blog of someone who got a KB11-A working, you'll really need KM11
cards...
On Nov 30, 2021, at 10:59 AM, Guy Sotomayor via cctalk
wrote:
I do still have KM11 boards and some
> On 11/30/21 10:06 AM, Noel Chiappa via cctalk wrote:
> From the blog of someone who got a KB11-A working, you'll really need KM11
> cards...
> On Nov 30, 2021, at 10:59 AM, Guy Sotomayor via cctalk
> wrote:
> I do still have KM11 boards and some overlays (I'd have to check to see if I
> have
On 11/30/21 10:06 AM, Noel Chiappa via cctalk wrote:
From the blog of someone who got a KB11-A working, you'll really need KM11
cards; dunno if Guy Steele still has those clones he was selling.
I think you meant me. Guy Steele is from Common LISP fame. ;-)
I do still have KM11 boards and
Very helpful! Thank you
On Tue, Nov 30, 2021, 19:06 Noel Chiappa wrote:
> > From: Ed Cross
>
> > I'm currently restoring a PDP-11/70 system and need the following
> > boards to complete the CPU: FP11-C
>
> From your mention of the FP11-C, I gather your -11/70 has a KB11-C (later)
> C
> From: Ed Cross
> I'm currently restoring a PDP-11/70 system and need the following
> boards to complete the CPU: FP11-C
>From your mention of the FP11-C, I gather your -11/70 has a KB11-C (later)
CPU, not the KB11-B CPU of the earlier PDP-11/70's (prior to 1976 - the
difference betw
> On Nov 29, 2021, at 4:12 PM, Josh Dersch via cctalk
> wrote:
>
> On Mon, Nov 29, 2021 at 1:06 PM Ethan Dicks via cctalk <
> cctalk@classiccmp.org> wrote:
>
>> On Mon, Nov 29, 2021 at 3:19 PM Henk Gooijen via cctalk
>> wrote:
>>> I think the FP11 boards are not essential for the 11/70
>>>
On Mon, Nov 29, 2021 at 1:06 PM Ethan Dicks via cctalk <
cctalk@classiccmp.org> wrote:
> On Mon, Nov 29, 2021 at 3:19 PM Henk Gooijen via cctalk
> wrote:
> > I think the FP11 boards are not essential for the 11/70
> > They only add hardware FP support.
>
> Not essential for many uses, but I'm pre
On Mon, Nov 29, 2021 at 3:19 PM Henk Gooijen via cctalk
wrote:
> I think the FP11 boards are not essential for the 11/70
> They only add hardware FP support.
Not essential for many uses, but I'm pretty sure UNIX is unhappy
without them. If you are going to run RSTS/E or RT-11, should be just
fin
Van: Jay Jaeger via cctalk<mailto:cctalk@classiccmp.org>
Verzonden: maandag 29 november 2021 21:05
Aan: cctalk@classiccmp.org<mailto:cctalk@classiccmp.org>
Onderwerp: Re: PDP-11/70 Boards
On 11/29/2021 7:32 AM, Ed C. via cctalk wrote:
> Dear list, I'm currently restoring a
On 11/29/2021 7:32 AM, Ed C. via cctalk wrote:
Dear list, I'm currently restoring a PDP-11/70 system and need the
following boards to complete the CPU:
FP11-C slots:
M8127
M8128
M8129
Cache slots:
M8142
M8143
M8144
M8145
Any help finding these is appreciated. Thanks.
So, it turns out that I
On 11/29/2021 7:32 AM, Ed C. via cctalk wrote:
Dear list, I'm currently restoring a PDP-11/70 system and need the
following boards to complete the CPU:
FP11-C slots:
M8127
M8128
M8129
Cache slots:
M8142
M8143
M8144
M8145
Any help finding these is appreciated. Thanks.
I presume you'd also ne
On 11/29/2021 7:32 AM, Ed C. via cctalk wrote:
Dear list, I'm currently restoring a PDP-11/70 system and need the
following boards to complete the CPU:
FP11-C slots:
M8127
M8128
M8129
Cache slots:
M8142
M8143
M8144
M8145
Any help finding these is appreciated. Thanks.
I have M8127, M8128, M8
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