---------------------------------------------------------- AeroElectric-List Digest Archive --- Total Messages Posted Thu 12/13/18: 7 ---------------------------------------------------------- Today's Message Index: ---------------------- 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 _____________________________________ Time: 09:05:31 AM PST US From: "Robert L. Nuckolls, III" Subject: Re: AeroElectric-List: 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 _____________________________________ Time: 10:43:24 AM PST US Subject: AeroElectric-List: Re: Cheap bench supply? From: "user9253" 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 _____________________________________ Time: 11:52:25 AM PST US From: "Robert L. Nuckolls, III" Subject: Re: AeroElectric-List: 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 _____________________________________ Time: 11:58:38 AM PST US From: "Robert L. Nuckolls, III" Subject: Re: AeroElectric-List: 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 _____________________________________ Time: 01:22:38 PM PST US From: Ken Ryan 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 ________________________________ Message 6 _____________________________________ Time: 02:34:00 PM PST US From: Lyn Robertson Subject: Re: AeroElectric-List: 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 _____________________________________ Time: 10:11:41 PM PST US From: ashleysc@broadstripe.net Subject: Re: AeroElectric-List: 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" 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? 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