> 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
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