> From: Ian Finder
> so just on the safe side we'll cover some Engineering for Poets (or
> Programmers)
ROFL!
Noel
> My favorite low tech dummy load is the one my father came up with: a couple
> of
> resistors (carbon composite is best, carbon film or metal film will do), 1-2
> watt size,
> in a jar filled with water. Works just fine for 100 watts or so, and is
> useable not just
> for power supplies bu
On 2015-10-26 2:32 PM, Ian Finder wrote:
Not sure how much of a noob you are, although you repeatedly claim to be
one so just on the safe side we'll cover some Engineering for Poets (or
Programmers) to reassure you ;) --
V = I * R
Power (watts) = I * V
You know the voltage of the monitor. You k
Hi Toby,
I'll try to post some photos in a week or 2. Rob has asked me to make some
internal load boards for him so I can show more details while I'm at it.
The bulb is the best option in my opinion and seems to work just fine
without additional cooling in the cube.
--
Brian
On Mon, Oct 26, 201
> On Oct 26, 2015, at 2:49 PM, Chuck Guzis wrote:
>
> On 10/26/2015 10:52 AM, Toby Thain wrote:
>
>
>> Damn, I already ordered a pile of HVAC gear.
>>
>> j/k - yeah that was what I was basically planning, Ian ... just as a
>> noob, I'm not totally confident with what a single air cooled part
ff-Topic
Posts"
Cc:
Sent: Monday, October 26, 2015 2:32 PM
Subject: Re: Model 152 PSU dummy loads - Re: NeXT
Cube - powers on briefly then off again
Not sure how much of a noob you are, although
you repeatedly claim to be
one so just on the safe side we'll cover some
Engineering f
On Mon, 26 Oct 2015, Chuck Guzis wrote:
The talk about dummy loads brought back a memory of the Heath Cantenna--an RF
dummy load consisting of a Globar (noninductive) resistor in a gallon paint
can filled with mineral oil with an attachment to a SO-239 "UHF" connector on
top. IIRC, it was lit
On 10/26/2015 10:52 AM, Toby Thain wrote:
Damn, I already ordered a pile of HVAC gear.
j/k - yeah that was what I was basically planning, Ian ... just as a
noob, I'm not totally confident with what a single air cooled part
can dissipate.
The talk about dummy loads brought back a memory of
Not sure how much of a noob you are, although you repeatedly claim to be
one so just on the safe side we'll cover some Engineering for Poets (or
Programmers) to reassure you ;) --
V = I * R
Power (watts) = I * V
You know the voltage of the monitor. You know the resistance of your
resistor. So, yo
On 2015-10-26 1:23 PM, Ian Finder wrote:
This thread took a turn for the absurd. Oil? Water? What a practical
bunch of people. /s
They make resistors with adequate cooling... Almost as if they're
rated for a certain number of watts of dissipation and you can buy
them based on that. They are resi
This thread took a turn for the absurd. Oil? Water? What a practical bunch of
people. /s
They make resistors with adequate cooling... Almost as if they're rated for a
certain number of watts of dissipation and you can buy them based on that. They
are resistors after all.
And if they overheat-
please skip this ridicule and grab yourself a couple of headlights from
a car.
On 26-10-15 17:16, Dale H. Cook wrote:
My recommendation of oil is based upon my decades of experience with broadband
dummy loads from 60 watts to 2.5 kilowatts. The dummy loads that I have worked
with for medium
At 11:09 AM 10/26/2015, Paul Koning wrote:
>... but tap water even in NYC?
New York City tap water is of higher quality than the tap water available in
many US cities.
Dale H. Cook, Roanoke/Lynchburg, VA
Osborne 1 / Kaypro 4-84 / Kaypro 1 / Amstrad PPC-640
http://plymouthcolony.net/starcity/rad
My recommendation of oil is based upon my decades of experience with broadband
dummy loads from 60 watts to 2.5 kilowatts. The dummy loads that I have worked
with for medium wave and below and from 5 kilowatts down have all been
convection air cooled. Broadband dummy loads that I have used for h
>
> OK, so a couple years back, I wanted to have some chemistry fun with the kids.
> So, I got out the jump cables, clamped them onto some aluminum foil, stuffed
> the foil into test tubes, filled the tubes with water, inverted both of them
> in the same basin and sprinkled in a little salt, cranke
On 2015-10-26 16:09, Paul Koning wrote:
On Oct 26, 2015, at 11:02 AM, Dale H. Cook wrote:
At 10:45 AM 10/26/2015, Jerry Weiss wrote:
Water in the dummy load? Water cooled - sure. Water immersed? Even
though I see it posted on the web, i have may doubts it would be a stable
method.
> On Oct 26, 2015, at 11:21 AM, Tapley, Mark wrote:
>
> On Oct 26, 2015, at 10:09 AM, Paul Koning wrote:
>
>>> I concur. Tap water may have contaminants (such as chlorine) that will
>>> cause electrical leakage.
>>
>> Sure, but so what? A dummy load is supposed to have electrical leakage.
On Oct 26, 2015, at 10:09 AM, Paul Koning wrote:
>> I concur. Tap water may have contaminants (such as chlorine) that will cause
>> electrical leakage.
>
> Sure, but so what? A dummy load is supposed to have electrical leakage. All
> that water contamination would do is reduce the effective
> On Oct 26, 2015, at 11:02 AM, Dale H. Cook wrote:
>
> At 10:45 AM 10/26/2015, Jerry Weiss wrote:
>
>> Water in the dummy load? Water cooled - sure. Water immersed? Even
>> though I see it posted on the web, i have may doubts it would be a stable
>> method.
>
> I concur. Tap water ma
> On Oct 26, 2015, at 10:56 AM, Paul Koning wrote:
>
>
>> On Oct 26, 2015, at 10:45 AM, Jerry Weiss wrote:
>>
>> Water in the dummy load? Water cooled - sure. Water immersed? ...
> ...
> But for low voltage dummy loads, or for medium power ham transmitters, the
> voltages involved are
Distilled water will not conduct. Its a perfect insulator. It will work
fine.
On 10/26/2015 7:45 AM, Jerry Weiss wrote:
> Water in the dummy load? Water cooled - sure. Water immersed? Even
> though I see it posted on the web, i have may doubts it would be a stable
> method.
>
> Oil is t
At 10:45 AM 10/26/2015, Jerry Weiss wrote:
>Water in the dummy load? Water cooled - sure. Water immersed? Even
>though I see it posted on the web, i have may doubts it would be a stable
>method.
I concur. Tap water may have contaminants (such as chlorine) that will cause
electrical leak
> On Oct 26, 2015, at 10:45 AM, Jerry Weiss wrote:
>
> Water in the dummy load? Water cooled - sure. Water immersed? Even
> though I see it posted on the web, i have may doubts it would be a stable
> method.
How stable do you need?
>
> Oil is the usual medium here.
Transformer oil
Water in the dummy load? Water cooled - sure. Water immersed? Even
though I see it posted on the web, i have may doubts it would be a stable
method.
Oil is the usual medium here. Excluding of course the pre-1980 transformer
oils that were notorious for having contaminated PCB’s with
> On Oct 26, 2015, at 9:43 AM, Toby Thain wrote:
>
> On 2015-10-26 1:02 AM, Brian Archer wrote:
>> Even a 10W resistor will get really hot. I embed two 5W resistors into a
>> pentium class CPU cooler for a good compromise on space/thermal concerns.
My favorite low tech dummy load is the one my
On 2015-10-26 1:02 AM, Brian Archer wrote:
Even a 10W resistor will get really hot. I embed two 5W resistors into a
pentium class CPU cooler for a good compromise on space/thermal concerns.
You can see a pic on my site here:
http://asterontech.com/Asterontech/next_adb_conversion.html
Hi Brian
Even a 10W resistor will get really hot. I embed two 5W resistors into a
pentium class CPU cooler for a good compromise on space/thermal concerns.
You can see a pic on my site here:
http://asterontech.com/Asterontech/next_adb_conversion.html
Internal to the cube, I've found using a 5W appliance bu
On 2015-10-25 8:56 PM, Toby Thain wrote:
On 2015-10-25 8:42 PM, Ian Finder wrote:
No- if it works with the standard display, the supply is fine.
Now that that's clear, I recall some cube supplies would do this
without a load for a display- I used to test them by triggering the
power-on pin, and
On 2015-10-25 8:42 PM, Ian Finder wrote:
No- if it works with the standard display, the supply is fine.
Now that that's clear, I recall some cube supplies would do this without a load
for a display- I used to test them by triggering the power-on pin, and seem to
remember this behavior occurrin
I should make clear that for what I'm saying below, I was NOT testing supplies
on their own, but was indeed testing a complete cube with the logic and hard
drives hooked up- just with no MegaPixel display attached.
And the point stands- Without a reasonable dummy load for the display itself,
so
No- if it works with the standard display, the supply is fine.
Now that that's clear, I recall some cube supplies would do this without a load
for a display- I used to test them by triggering the power-on pin, and seem to
remember this behavior occurring if I didn't have a big-ass resistor attac
On 2015-10-25 7:21 PM, Ian Finder wrote:
I would replace the electrolytic capacitors in the power supply before going
further.
Well, the problem disappears with the standard setup. You still think
caps could be at issue with the splitter setup? What's your detailed
thinking?
--Toby
Sent
I would replace the electrolytic capacitors in the power supply before going
further.
Sent from my iPhone
> On Oct 25, 2015, at 15:38, Toby Thain wrote:
>
>> On 2015-10-25 5:28 PM, Toby Thain wrote:
>> Hi,
>>
>> After a few years I wanted to try my Cube with the soundbox/VGA splitter
>> confi
On 2015-10-25 5:28 PM, Toby Thain wrote:
Hi,
After a few years I wanted to try my Cube with the soundbox/VGA splitter
configuration for the first time. (I have the fading phosphor N4000A so
have been keen to have an alternate video solution.)
However, all is not well. Using the keyboard power b
Hi,
After a few years I wanted to try my Cube with the soundbox/VGA splitter
configuration for the first time. (I have the fading phosphor N4000A so
have been keen to have an alternate video solution.)
However, all is not well. Using the keyboard power button, the machine
powers on for a cou
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