Today's Message Index:
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1. 09:05 AM - Re: Cheap bench supply? (Robert L. Nuckolls, III)
2. 10:43 AM - Re: Cheap bench supply? (user9253)
3. 11:52 AM - Re: Re: Cheap bench supply? (Robert L. Nuckolls, III)
4. 11:58 AM - Re: Re: Cheap bench supply? (Robert L. Nuckolls, III)
5. 01:22 PM - star washers (Ken Ryan)
6. 02:34 PM - Re: Re: Cheap bench supply? (Lyn Robertson)
7. 10:11 PM - Re: star washers (ashleysc@broadstripe.net)
Message 1
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| Subject: | Re: Cheap bench supply? |
At 12:12 AM 12/11/2018, you wrote:
>For those of us who do not care about limiting the current, is there
>a cheaper way of getting 20A between 5 and 30V?
That's going to be a 600W supply . . . pretty rare
in the constellation of off-shore offerings to hobbyists.
Fixed voltage supplies in that power class are readily
available, here's one example
https://tinyurl.com/y6tw6k6o
Adjustable supplies with that capability
are more likely to be found as used,
lab grade power supplies like this
excellent buy
https://tinyurl.com/ybgkh4ov
. . . but trust me, supplies in this
power class are capable of much smoke.
You will come to LOVE that current
limiting feature.
Bob . . .
Message 2
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| Subject: | Re: Cheap bench supply? |
That excellent buy costs $92 to ship. It must be big and heavy.
--------
Joe Gores
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=486278#486278
Message 3
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| Subject: | Re: Cheap bench supply? |
At 12:42 PM 12/13/2018, you wrote:
>
>That excellent buy costs $92 to ship. It must be big and heavy.
Yup . . . probably 40 pounds. They're rack mounted
supplies about 9 inches high. I have one on my
bench. Had it about 15 years and it was
10-15 years old when I got it. It's HP . . . built
to last. Probably cost about $3000 new.
Bob . . .
Message 4
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| Subject: | Re: Cheap bench supply? |
At 12:42 PM 12/13/2018, you wrote:
>
>That excellent buy costs $92 to ship. It must be big and heavy.
Yup . . . probably 40 pounds. They're rack mounted
supplies about 9 inches high. I have one on my
bench. Had it about 15 years and it was
10-15 years old when I got it. It's HP . . . built
to last. Probably cost about $3000 new.
CORRECTION. Closer to 40 years old when I
got it and they're 93 pounds.
Bob . . .
Message 5
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Bob,
In the recent weeks/months I "think" I saw what appear to me to be
contradicting posts regarding the use of star washers.
In one discussion I thought you said that star washers are never used in
the current path on any certified airplanes. I think the reason was that
they prevent the gas tight seal that will inhibit corrosion.
Then, in a second discussion about bus bar construction using brass bars, I
thought you said to be sure to use a star washer under each terminal.
Could you clear up my confusions as to your approach to using star washers
in an aircraft electrical system?
Thanks,
Ken
Message 6
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| Subject: | Re: Cheap bench supply? |
The HP stands for =9Cheavy product=9D. ;-)
On Thu, Dec 13, 2018 at 12:03 Robert L. Nuckolls, III <
nuckolls.bob@aeroelectric.com> wrote:
> At 12:42 PM 12/13/2018, you wrote:
>
>
> That excellent buy costs $92 to ship. It must be big and heavy.
>
>
> Yup . . . probably 40 pounds. They're rack mounted
> supplies about 9 inches high. I have one on my
> bench. Had it about 15 years and it was
> 10-15 years old when I got it. It's HP . . . built
> to last. Probably cost about $3000 new.
>
> CORRECTION. Closer to 40 years old when I
> got it and they're 93 pounds.
>
>
> Bob . . .
>
Message 7
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| Subject: | Re: star washers |
Hi Ken;
I think star washers would make good electrical contact, but I don't like them
against aluminum, as they can initiate cracks.
Cheers! Stu.
----- Original Message -----
From: "Ken Ryan" <keninalaska@gmail.com>
Sent: Thursday, December 13, 2018 1:21:13 PM
Subject: AeroElectric-List: star washers
Bob,
In the recent weeks/months I "think" I saw what appear to me to be contradicting
posts regarding the use of star washers.
In one discussion I thought you said that star washers are never used in the current
path on any certified airplanes. I think the reason was that they prevent
the gas tight seal that will inhibit corrosion.
Then, in a second discussion about bus bar construction using brass bars, I thought
you said to be sure to use a star washer under each terminal.
Could you clear up my confusions as to your approach to using star washers in an
aircraft electrical system?
Thanks,
Ken
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