---------------------------------------------------------- AeroElectric-List Digest Archive --- Total Messages Posted Wed 11/14/18: 12 ---------------------------------------------------------- Today's Message Index: ---------------------- 1. 12:12 AM - For Sale [10 Pieces] Apple iPhone XR New 128GB $3,990CAD (eaartphrni) 2. 01:01 AM - Re: Cheap bench supply? (John Tipton) 3. 06:17 AM - Re: Cheap bench supply? (Ernest Christley) 4. 07:03 AM - Re: Cheap bench supply? (Charlie England) 5. 07:57 AM - Re: Cheap bench supply? (Sebastien) 6. 10:05 AM - Re: Cheap bench supply? (Charlie England) 7. 10:07 AM - Re: Cheap bench supply? (Ernest Christley) 8. 10:12 AM - Re: Cheap bench supply? (MMiller) 9. 10:58 AM - Re: Re: Cheap bench supply? (Charlie England) 10. 02:00 PM - Re: Re: Cheap bench supply? (jim) 11. 02:48 PM - Re: Cheap bench supply? (Alec Myers) 12. 06:58 PM - Re: Re: Cheap bench supply? (Robert L. Nuckolls, III) ________________________________ Message 1 _____________________________________ Time: 12:12:32 AM PST US Subject: AeroElectric-List: For Sale [10 Pieces] Apple iPhone XR New 128GB $3,990CAD From: "eaartphrni" Available to buy on our website www . esellibuy.com Read this topic online here: http://forums.matronics.com/viewtopic.php?p=484999#484999 ________________________________ Message 2 _____________________________________ Time: 01:01:11 AM PST US From: John Tipton Subject: Re: AeroElectric-List: Cheap bench supply? What=99s wrong with a =98cb=99 type radio power supply, 13 .8 volts, 3-5 amps, why do you need something giving variable volts/amps, ar e you really going to test your expensive electronics by playing around with varying these outputs =94- John Sent from my iPad ----x--O--x---- > On 14 Nov 2018, at 3:11 am, Charlie England wrote: > > Thanks, to Richard, Earnest and Bob. Looks like I need to go ahead & pull t he trigger. I'll report when it comes in. > > Charlie > >> On 11/13/2018 7:47 PM, Richard Girard wrote: >> Charlie, this is the one I bought on Amazon. . >> >> https://www.amazon.com/Dr-meter-Single-Output-Switchable-Alligator-includ ed/dp/B07D4FQ4CP/ref=sr_1_17?ie=UTF8&qid=1542159852&sr=8-17&keywords =bench+power+supply >> >> Rick Girard >> >>> On Tue, Nov 13, 2018 at 6:29 PM Brian Lester wr ote: >>> A bit more expensive but I got this from amazon. DC Power Supply Variabl e,0-30 V / 0-10 A Eventek KPS3010D Adjustable Switching Regulated Power Supp ly Digital >>> https://www.amazon.com/dp/B073TW8H2S/ref=cm_sw_r_cp_api_qY16BbT9P9Y2P >>> >>> But honestly the stuff on eBay looks about the same at a better price. >>> -Brian >>>> On Tue, Nov 13, 2018 at 6:44 PM Charlie England w rote: >>>> Thanks, Ernest. Anyone else? >>>> >>>>> On Tue, Nov 13, 2018 at 5:18 PM Ernest Christley w rote: >>>>> Looks very much like the onei bought from mpja.com. mine works perfect ly. >>>>> >>>>> Sent from Yahoo Mail on Android >>>>> >>>>> On Tue, Nov 13, 2018 at 5:56 PM, Charlie England >>>>> wrote: >>>>> Anyone have experience with the recent ebay offerings for cheap lab su pplies? Example below. I tried searching my old AEC emails, but the most rec ent reference I found was for a much more expensive model. It'll get minimal use; just final checkout of my project's wiring and then rare uses after th at, so don't want to spend $hundreds. >>>>> 0-30v/0-10a bench supply >>>>> >>>>> Thanks, >>>>> >>>>> Charlie >> >> >> -- >> =9CBlessed are the cracked, for they shall let in the light.=9D Groucho Marx >> >> > > > Virus-free. www.avast.com ________________________________ Message 3 _____________________________________ Time: 06:17:03 AM PST US From: Ernest Christley Subject: Re: AeroElectric-List: Cheap bench supply? Several reasons, John. 1) Powering avionics will not be the only reason I ever need a power supply .=C2- I've used the one I bought for several other electronics projects t hat required different voltages. 2) You can ramp down the voltage to see where a particular instrument stops working.=C2- Useful for planning alternator out situations. 3) The ability to limit current allows you to safely test "experimental" el ectronics.=C2- Apply voltage at 1/2 an amp will let you test a circuit th at may have=C2- a short. On Wednesday, November 14, 2018, 4:03:06 AM EST, John Tipton wrote: What=99s wrong with a =98cb=99 type radio power supply, 13.8 volts, 3-5 amps, why do you need something giving variable volts/amps, are you really going to test your expensive electronics by playing around with varying these outputs =94- John Sent from my iPad =C2- =C2- =C2-----x--O--x---- On 14 Nov 2018, at 3:11 am, Charlie England wrote: Thanks, to Richard, Earnest and Bob. Looks like I need to go ahead & pull t he trigger. I'll report when it comes in. Charlie On 11/13/2018 7:47 PM, Richard Girard wrote: Charlie, this is the one I bought on Amazon. .=C2- https://www.amazon.com/Dr-meter-Single-Output-Switchable-Alligator-includ ed/dp/B07D4FQ4CP/ref=sr_1_17?ie=UTF8&qid=1542159852&sr=8-17&keyword s=bench+power+supply Rick Girard On Tue, Nov 13, 2018 at 6:29 PM Brian Lester wro te: A bit more expensive but I got this from amazon. DC Power Supply Variable,0 -30 V / 0-10 A Eventek KPS3010D Adjustable Switching Regulated Power Supply Digital https://www.amazon.com/dp/B073TW8H2S/ref=cm_sw_r_cp_api_qY16BbT9P9Y2P But honestly the stuff on eBay looks about the same at a better price. -Brian On Tue, Nov 13, 2018 at 6:44 PM Charlie England wr ote: Thanks, Ernest. Anyone else? On Tue, Nov 13, 2018 at 5:18 PM Ernest Christley wro te: Looks very much like the onei bought from mpja.com. mine works perfectly. Sent from Yahoo Mail on Android On Tue, Nov 13, 2018 at 5:56 PM, Charlie England w rote: Anyone have experience with the recent ebay offerings for cheap l ab supplies? Example below. I tried searching my old AEC emails, but the mo st recent reference I found was for a much more expensive model. It'll get minimal use; just final checkout of my project's wiring and then rare uses after that, so don't want to spend $hundreds.=C2- 0-30v/0-10a bench supp ly Thanks, Charlie -- =9CBlessed are the cracked, for they shall let in the light.=9D =C2-=C2-Groucho Marx | | Virus-free. www.avast.com | ________________________________ Message 4 _____________________________________ Time: 07:03:22 AM PST US Subject: Re: AeroElectric-List: Cheap bench supply? From: Charlie England Bingo=2E Ability to adjust voltage and limit current can minimize damage if somethings not right=2E Biggest exception is 'switcher' power supplies; th ey are trickier to test that way=2E =81=A3Charlie=8B On Nov 14, 2018, 8:24 AM, at 8:24 AM, Ernest Christley wrote: > Several reasons, John=2E >1) Powering avionics will not be the only reason I ever need a power >supply=2E=C2- I've used the one I bought for severa l other electronics >projects that required different voltages=2E >2) You c an ramp down the voltage to see where a particular instrument >stops workin g=2E=C2- Useful for planning alternator out situations=2E >3) The ability to limit current allows you to safely test >"experimental" electronics=2E =C2- Apply voltage at 1/2 an amp will let you >test a circuit that may ha ve=C2- a short=2E > >On Wednesday, November 14, 2018, 4:03:06 AM EST, Joh n Tipton > wrote: > >What=99s wrong with a =98cb=99 type radio power supply, 13=2E8 volts, 3-5 amps, >why do you need something giving variable volts/amps, are you really >going to tes t your expensive electronics by playing around with varying >these outputs =94- >John > >Sent from my iPad >=C2- =C2- =C2-----x--O--x---- >On 14 Nov 2018, at 3:11 am, Charlie England >wrot e: > > > >Thanks, to Richard, Earnest and Bob=2E Looks like I need to go a head & >pull the trigger=2E I'll report when it comes in=2E > > Charlie > > On 11/13/2018 7:47 PM, Richard Girard wrote: > > > Charlie, this is t he one I bought on Amazon=2E =2E=C2- >https://www=2Eamazon=2Ecom/Dr-mete r-Single-Output-Switchable-Alligator-included/dp/B07D4FQ4CP/ref=sr_1_17?i e=UTF8&qid=1542159852&sr=8-17&keywords=bench+power+supply > > Ri ck Girard >On Tue, Nov 13, 2018 at 6:29 PM Brian Lester >wrote: > >A bit more expensive but I got this from amazon =2E DC Power Supply >Variable,0-30 V / 0-10 A Eventek KPS3010D Adjustable S witching >Regulated Power Supply Digital > https://www=2Eamazon=2Ecom/dp/B0 73TW8H2S/ref=cm_sw_r_cp_api_qY16BbT9P9Y2P > >But honestly the stuff on e Bay looks about the same at a better price=2E > -Brian >On Tue, Nov 13, 2 018 at 6:44 PM Charlie England >wrote: > > Than ks, Ernest=2E Anyone else? >On Tue, Nov 13, 2018 at 5:18 PM Ernest Christ ley >wrote: > >Looks very much like the onei bough t from mpja=2Ecom=2E mine works >perfectly=2E > > Sent from Yahoo Mail on Android > >On Tue, Nov 13, 2018 at 5:56 PM, Charlie England >wrote: Anyone have experience with the recent ebay offerin gs for >cheap lab supplies? Example below=2E I tried searching my old AEC e mails, >but the most recent reference I found was for a much more expensive >model=2E It'll get minimal use; just final checkout of my project's >wir ing and then rare uses after that, so don't want to spend >$hundreds=2E=C2 - 0-30v/0-10a bench supply > > Thanks, > Charlie > > > > > > -- > >=9CBlessed are the cracked, for they shall let in the light=2E=9D =C2-=C2-Groucho >Marx > > > > >| | Vir us-free=2E www=2Eavast=2Ecom | > > ________________________________ Message 5 _____________________________________ Time: 07:57:21 AM PST US From: Sebastien Subject: Re: AeroElectric-List: Cheap bench supply? I have been thinking of getting one of these as well but a 30V 20A model. I have used one before but I'm not entirely sure how they work. What is the function on the amperage dial? In what situation would you set it lower than the maximum output of the power supply? On Wed, Nov 14, 2018, 04:06 John Tipton What=99s wrong with a =98cb=99 type radio power supply, 13.8 volts, 3-5 amps, > why do you need something giving variable volts/amps, are you really goin g > to test your expensive electronics by playing around with varying these > outputs =94- > > John > > Sent from my iPad > > ----x--O--x---- > > On 14 Nov 2018, at 3:11 am, Charlie England wrote: > > Thanks, to Richard, Earnest and Bob. Looks like I need to go ahead & pull > the trigger. I'll report when it comes in. > > Charlie > > On 11/13/2018 7:47 PM, Richard Girard wrote: > > Charlie, this is the one I bought on Amazon. . > > > https://www.amazon.com/Dr-meter-Single-Output-Switchable-Alligator-includ ed/dp/B07D4FQ4CP/ref=sr_1_17?ie=UTF8&qid=1542159852&sr=8-17&keyword s=bench+power+supply > > Rick Girard > > On Tue, Nov 13, 2018 at 6:29 PM Brian Lester > wrote: > >> A bit more expensive but I got this from amazon. DC Power Supply >> Variable,0-30 V / 0-10 A Eventek KPS3010D Adjustable Switching Regulated >> Power Supply Digital >> https://www.amazon.com/dp/B073TW8H2S/ref=cm_sw_r_cp_api_qY16BbT9P9Y2P >> >> But honestly the stuff on eBay looks about the same at a better price. >> -Brian >> On Tue, Nov 13, 2018 at 6:44 PM Charlie England >> wrote: >> >>> Thanks, Ernest. Anyone else? >>> >>> On Tue, Nov 13, 2018 at 5:18 PM Ernest Christley >>> wrote: >>> >>>> Looks very much like the onei bought from mpja.com. mine works >>>> perfectly. >>>> >>>> Sent from Yahoo Mail on Android >>>> >>>> >>>> On Tue, Nov 13, 2018 at 5:56 PM, Charlie England >>>> wrote: >>>> Anyone have experience with the recent ebay offerings for cheap lab >>>> supplies? Example below. I tried searching my old AEC emails, but the most >>>> recent reference I found was for a much more expensive model. It'll ge t >>>> minimal use; just final checkout of my project's wiring and then rare uses >>>> after that, so don't want to spend $hundreds. >>>> 0-30v/0-10a bench supply >>>> >>>> >>>> Thanks, >>>> >>>> Charlie >>>> >>>> > > -- > =9CBlessed are the cracked, for they shall let in the light. =9D Groucho Marx > > > > Virus-free .. > www.avast.com > > <#m_-7689733828043912502_DAB4FAD8-2DD7-40BB-A1B8-4E2AA1F9FDF2> > > ________________________________ Message 6 _____________________________________ Time: 10:05:32 AM PST US Subject: Re: AeroElectric-List: Cheap bench supply? From: Charlie England For my purposes at the moment, the current setting would be used to minimize risk of catastrophic failure in a device that's polarity sensitive, such as electronics, or possibly external stuff around a DC motor that might get hooked up backward. The way I'd use it is to set voltage to zero, and current to some relatively low percentage of a given device's max current draw. Apply power to the device, and slowly increase voltage while monitoring current and the device 'waking up'. The current limiter may well reduce the voltage below set point, to control current, if there's an 'issue'. If everything's nominal at normal 12-14V, then current limit can be raised to the device's normal operating current to check operation. I've used simple variable voltage supplies for decades when troubleshooting or checking devices (mostly audio gear), but without the current limiter, the operator (me) becomes the detector/limiter, and may not be perceptive or quick-reacting enough to avoid damage. I'm getting lazy in my slower response time old age. :-) If you decide to roll your own LED landing lights, for example, a variable voltage/current supply could conceivably be used to experiment with various high power LEDs before buying a dedicated LED driver board. As I mentioned earlier, the only thing I can think of that would be tougher to test this way would be electronics with 'switcher' power supplies. The switcher will try to draw as much current as it needs, to make full output, and may tend to be either full off (inadequate supply current) or full on, so the current/voltage monitoring technique may prove meaningless with some of those devices. Even with those devices, we can at least check that we have polarity correct and on the correct pin(s). Charlie On 11/14/2018 9:55 AM, Sebastien wrote: > I have been thinking of getting one of these as well but a 30V 20A > model. I have used one before but I'm not entirely sure how they work. > What is the function on the amperage dial? In what situation would you > set it lower than the maximum output of the power supply? > > On Wed, Nov 14, 2018, 04:06 John Tipton wrote: > > Whats wrong with a cb type radio power supply, 13.8 volts, 3-5 > amps, why do you need something giving variable volts/amps, are > you really going to test your expensive electronics by playing > around with varying these outputs - > > John > > Sent from my iPad > > ----x--O--x---- > > On 14 Nov 2018, at 3:11 am, Charlie England > wrote: > >> Thanks, to Richard, Earnest and Bob. Looks like I need to go >> ahead & pull the trigger. I'll report when it comes in. >> >> Charlie >> >> On 11/13/2018 7:47 PM, Richard Girard wrote: >>> Charlie, this is the one I bought on Amazon. . >>> >>> https://www.amazon.com/Dr-meter-Single-Output-Switchable-Alligator-included/dp/B07D4FQ4CP/ref=sr_1_17?ie=UTF8&qid=1542159852&sr=8-17&keywords=bench+power+supply >>> >>> Rick Girard >>> >>> On Tue, Nov 13, 2018 at 6:29 PM Brian Lester >>> > wrote: >>> >>> A bit more expensive but I got this from amazon. DC Power >>> Supply Variable,0-30 V / 0-10 A Eventek KPS3010D Adjustable >>> Switching Regulated Power Supply Digital >>> https://www.amazon.com/dp/B073TW8H2S/ref=cm_sw_r_cp_api_qY16BbT9P9Y2P >>> >>> But honestly the stuff on eBay looks about the same at a >>> better price. >>> -Brian >>> On Tue, Nov 13, 2018 at 6:44 PM Charlie England >>> > wrote: >>> >>> Thanks, Ernest. Anyone else? >>> >>> On Tue, Nov 13, 2018 at 5:18 PM Ernest Christley >>> > wrote: >>> >>> Looks very much like the onei bought from mpja.com >>> . mine works perfectly. >>> >>> Sent from Yahoo Mail on Android >>> >>> >>> On Tue, Nov 13, 2018 at 5:56 PM, Charlie England >>> >> > wrote: >>> Anyone have experience with the recent ebay >>> offerings for cheap lab supplies? Example below. >>> I tried searching my old AEC emails, but the >>> most recent reference I found was for a much >>> more expensive model. It'll get minimal use; >>> just final checkout of my project's wiring and >>> then rare uses after that, so don't want to >>> spend $hundreds. >>> 0-30v/0-10a bench supply >>> >>> >>> Thanks, >>> >>> Charlie >>> >>> >>> >>> -- >>> >>> >>> Blessed are the cracked, for they shall let in the light. >>> Groucho Marx >>> >>> >>> >> >> >> >> Virus-free. www.avast.com >> >> >> >> <#m_-7689733828043912502_DAB4FAD8-2DD7-40BB-A1B8-4E2AA1F9FDF2> > --- This email has been checked for viruses by Avast antivirus software. https://www.avast.com/antivirus ________________________________ Message 7 _____________________________________ Time: 10:07:57 AM PST US From: Ernest Christley Subject: Re: AeroElectric-List: Cheap bench supply? Yes. You can turn the current down so that no matter the voltage, you only get a set amount of current. Sent from Yahoo Mail on Android On Wed, Nov 14, 2018 at 10:58 AM, Sebastien wrote: I have been thinking of getting one of these as well but a 30V 20A model. I h ave used one before but I'm not entirely sure how they work. What is the fu nction on the amperage dial? In what situation would you set it lower than the maximum output of the power supply? On Wed, Nov 14, 2018, 04:06 John Tipton wrote: Thanks, to Richard, Earnest and Bob. Looks like I need to go ahead & pull the trigger. I'll report when it comes in. Charlie On 11/13/2018 7:47 PM, Richard Girard wrote: Charlie, this is the one I bought on Amazon. .=C2- https://www.amazon.com/Dr-meter-Single-Output-Switchable-Alligator-includ ed/dp/B07D4FQ4CP/ref=sr_1_17?ie=UTF8&qid=1542159852&sr=8-17&keyword s=bench+power+supply Rick Girard On Tue, Nov 13, 2018 at 6:29 PM Brian Lester wro te: A bit more expensive but I got this from amazon. DC Power Supply Variable,0 -30 V / 0-10 A Eventek KPS3010D Adjustable Switching Regulated Power Supply Digital https://www.amazon.com/dp/B073TW8H2S/ref=cm_sw_r_cp_api_qY16BbT9P9Y2P But honestly the stuff on eBay looks about the same at a better price. -Brian On Tue, Nov 13, 2018 at 6:44 PM Charlie England wr ote: Thanks, Ernest. Anyone else? On Tue, Nov 13, 2018 at 5:18 PM Ernest Christley wro te: Looks very much like the onei bought from mpja.com. mine works perfectly. Sent from Yahoo Mail on Android On Tue, Nov 13, 2018 at 5:56 PM, Charlie England w rote: Anyone have experience with the recent ebay offerings for cheap l ab supplies? Example below. I tried searching my old AEC emails, but the mo st recent reference I found was for a much more expensive model. It'll get minimal use; just final checkout of my project's wiring and then rare uses after that, so don't want to spend $hundreds.=C2- 0-30v/0-10a bench supp ly Thanks, Charlie -- =9CBlessed are the cracked, for they shall let in the light.=9D =C2-=C2-Groucho Marx | | Virus-free. www.avast.com | ________________________________ Message 8 _____________________________________ Time: 10:12:19 AM PST US Subject: AeroElectric-List: Re: Cheap bench supply? From: "MMiller" Charlie, I bought two of these units back in June from a different Ebay vendor. The only issue I had was an intermittent connection in the line cord at P/S end of one unit. It uses a standard computer line cord, so I just replaced it with one I had laying around. It works as advertised and its a good value. Read this topic online here: http://forums.matronics.com/viewtopic.php?p=485014#485014 ________________________________ Message 9 _____________________________________ Time: 10:58:58 AM PST US Subject: Re: AeroElectric-List: Re: Cheap bench supply? From: Charlie England On 11/14/2018 12:11 PM, MMiller wrote: > > Charlie, I bought two of these units back in June from a different Ebay vendor. The only issue I had was an intermittent connection in the line cord at P/S end of one unit. It uses a standard computer line cord, so I just replaced it with one I had laying around. It works as advertised and its a good value. > Sounds good. Thanks for the 'PIREP'; I've got one on the way. Charlie --- This email has been checked for viruses by Avast antivirus software. https://www.avast.com/antivirus ________________________________ Message 10 ____________________________________ Time: 02:00:55 PM PST US From: "jim" Subject: RE: AeroElectric-List: Re: Cheap bench supply? I am careful about buying electronic equipment like battery chargers and power supplies. The very inexpensive stuff Is built from inexpensive parts which may fail fairly quickly. It this kind of equipment fails in the max voltage mode, it can FRY some very expensive equipment being powered or tested in short order. A battery charger that fails in an over voltage mode can COOK a very expensive battery quickly. I have wondered the streets of some of the third world countries and seen some of the "SURPLUS" electronic parts that often go into cheap test equipment. This was a real eye opener experience. -----Original Message----- From: owner-aeroelectric-list-server@matronics.com On Behalf Of MMiller Sent: Wednesday, November 14, 2018 12:12 PM Subject: AeroElectric-List: Re: Cheap bench supply? Charlie, I bought two of these units back in June from a different Ebay vendor. The only issue I had was an intermittent connection in the line cord at P/S end of one unit. It uses a standard computer line cord, so I just replaced it with one I had laying around. It works as advertised and its a good value. Read this topic online here: http://forums.matronics.com/viewtopic.php?p=485014#485014 ________________________________ Message 11 ____________________________________ Time: 02:48:38 PM PST US From: Alec Myers Subject: Re: AeroElectric-List: Cheap bench supply? The current adjustment sets an upper bound on the current the unit will supply. If you try to draw more current than that, the output voltage falls far enough that the current stays at the limit you set. You can use PSUs with a current limiting facility in either of two modes. Either constant voltage, which is what is normally used, or constant current mode. There are not many circuits that need a constant current drive, but I used to use one for charging NiCd batteries (in the olden days) where the current would be set at (say) 5x the one hour cell capacity and I could charge four or more cells in series. The terminal voltage would start low, and automatically rise as the cells charged. >>In what situation would you set it lower than the maximum output of the power supply? When you have a circuit that needs a constant current supply, or, as someone suggested, when you have a circuit which, should a fault develop, you want to limit the maximum power your supply can generate. On Nov 14, 2018, at 10:55 AM, Sebastien wrote: I have been thinking of getting one of these as well but a 30V 20A model. I have used one before but I'm not entirely sure how they work. What is the function on the amperage dial? In what situation would you set it lower than the maximum output of the power supply? On Wed, Nov 14, 2018, 04:06 John Tipton wrote: > Thanks, to Richard, Earnest and Bob. Looks like I need to go ahead & pull the trigger. I'll report when it comes in. > > Charlie > > On 11/13/2018 7:47 PM, Richard Girard wrote: >> Charlie, this is the one I bought on Amazon. . >> >> https://www.amazon.com/Dr-meter-Single-Output-Switchable-Alligator-included/dp/B07D4FQ4CP/ref=sr_1_17?ie=UTF8&qid=1542159852&sr=8-17&keywords=bench+power+supply >> >> Rick Girard >> >> On Tue, Nov 13, 2018 at 6:29 PM Brian Lester wrote: >> A bit more expensive but I got this from amazon. DC Power Supply Variable,0-30 V / 0-10 A Eventek KPS3010D Adjustable Switching Regulated Power Supply Digital >> https://www.amazon.com/dp/B073TW8H2S/ref=cm_sw_r_cp_api_qY16BbT9P9Y2P >> >> But honestly the stuff on eBay looks about the same at a better price. >> -Brian >> On Tue, Nov 13, 2018 at 6:44 PM Charlie England wrote: >> Thanks, Ernest. Anyone else? >> >> On Tue, Nov 13, 2018 at 5:18 PM Ernest Christley wrote: >> Looks very much like the onei bought from mpja.com. mine works perfectly. >> >> Sent from Yahoo Mail on Android >> >> On Tue, Nov 13, 2018 at 5:56 PM, Charlie England >> wrote: >> Anyone have experience with the recent ebay offerings for cheap lab supplies? Example below. I tried searching my old AEC emails, but the most recent reference I found was for a much more expensive model. It'll get minimal use; just final checkout of my project's wiring and then rare uses after that, so don't want to spend $hundreds. >> 0-30v/0-10a bench supply >> >> Thanks, >> >> Charlie >> >> >> -- >> Blessed are the cracked, for they shall let in the light. Groucho Marx >> >> > > > Virus-free. www.avast.com ________________________________ Message 12 ____________________________________ Time: 06:58:29 PM PST US From: "Robert L. Nuckolls, III" Subject: RE: AeroElectric-List: Re: Cheap bench supply? At 04:00 PM 11/14/2018, you wrote: > >I am careful about buying electronic equipment like battery chargers >and power supplies. > >The very inexpensive stuff Is built from inexpensive parts which may >fail fairly quickly. > >It this kind of equipment fails in the max voltage mode, it can FRY >some very expensive equipment being powered or tested in short >order. A battery charger that fails in an over voltage mode can >COOK a very expensive battery quickly. > >I have wondered the streets of some of the third world countries and >seen some of the "SURPLUS" electronic parts that often go into cheap >test equipment. This was a real eye opener experience. I can't speak from any documentable source but I believe your concerns are becoming less significant if not non-existant. The ability of industries to fabricate and utilize perfectly acceptable parts has been falling exponentially for some time. The handling $COST$ of processing sub-standard parts into products can easily exceed the cost of 'good' parts. Ergo, for the vast majority of examples on the market, I've found that the offerings are of good value. Out here in the hinterlands of western Kansas, my FIRST choice for on-line shopping is eBay, not necessarily because it has proven to be 'better' than any other source . . . only adequate to my needs. Vendors with high percentages of satisfactory customers over hundreds if not thousands of transactions have proven to be very low if not zero risk. 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