Just a test of settings – Thanks Gents – WØDR / Dave
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I would probably use 3 pogo pins spaced at .1 inch so they line up with the top of the leads where they exit the device. Then it don't matter of the leads are bent or have globs of solder. You can quickly lay the device on it's back and press the pogo pins done to test the device. Maybe hot glue the pogo pins next to each other or drill out a piece of wood to space the pins. It all depends on the type of pogo pins you get. They are available all over E-Bay and used in test jigs.
Joe Loucka AG4QC
On Wed, Oct 30, 2013 at 10:27 AM, Jim <n6otq@...> wrote:
Did I leave out the part where I said that I had dozens, perhaps hundreds, of these devices and I don't want to rebuild a test jig every time I want to use a device?
And did I also leave out the part where if I'm going to be testing dozens, perhaps hundreds, of these devices at a time, that I don't want to squeeze three separate alligator clips for every device, and replace the clips when they invariably go bad after a hundred squeezes?
Jim,No, you didn't leave those parts out, and neither did you omit "I'm willing to discuss and I welcome suggestions."Since the leads of TO-222 devices are spaced 0.10" apart, you can rely on a piece of an IC socket for your DUT receptacle. You could also use a small plug-in breadboard--just a few bucks--and set up your test circuit on that. All the sockets on those are spaced 0.10" as well. I have a few circuits I've "breadboarded" but then leave intact for later use.73,Todd------------------------------------------------------------------------------------K7TFC / Medford, Oregon, USA / CN82ni / UTC-7 (PDT)------------------------------------------------------------------------------------
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On Wed, Oct 30, 2013 at 10:27 AM, Jim <n6otq@yahoo.com> wrote:
Did I leave out the part where I said that I had dozens, perhaps hundreds, of these devices and I don't want to rebuild a test jig every time I want to use a device?
And did I also leave out the part where if I'm going to be testing dozens, perhaps hundreds, of these devices at a time, that I don't want to squeeze three separate alligator clips for every device, and replace the clips when they invariably go bad after a hundred squeezes?
Jim,No, you didn't leave those parts out, and neither did you omit "I'm willing to discuss and I welcome suggestions."Since the leads of TO-222 devices are spaced 0.10" apart, you can rely on a piece of an IC socket for your DUT receptacle. You could also use a small plug-in breadboard--just a few bucks--and set up your test circuit on that. All the sockets on those are spaced 0.10" as well. I have a few circuits I've "breadboarded" but then leave intact for later use.73,Todd------------------------------------------------------------------------------------K7TFC / Medford, Oregon, USA / CN82ni / UTC-7 (PDT)------------------------------------------------------------------------------------
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Did I leave out the part where I said that I had dozens, perhaps hundreds, of these devices and I don't want to rebuild a test jig every time I want to use a device?
And did I also leave out the part where if I'm going to be testing dozens, perhaps hundreds, of these devices at a time, that I don't want to squeeze three separate alligator clips for every device, and replace the clips when they invariably go bad after a hundred squeezes?
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Should be easy to make a test setup (it would take just a minute)
Dg9bfc
Sigi
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Should be easy to make a test setup (it would take just a minute)
Dg9bfc
Sigi
> -----Ursprüngliche Nachricht-----
> Von: Amateur-repairs@yahoogroups.com [mailto:Amateur-
> repairs@yahoogroups.com] Im Auftrag von Jim
> Gesendet: Dienstag, 29. Oktober 2013 23:06
> An: Amateur-repairs@yahoogroups.com
> Betreff: Re: [Amateur-repairs] Test jigs for potentiometers, TO-220
> devices?
>
>
>
> Hi Todd
>
> I don't need an automated tester for the voltage regulators. I can live
> with a toggle switch to change between fixed and variable regulators, and
> a pair of meters for volts and amps. And maybe a switchable load.
>
> More important is the mechanism to clamp onto the leads. A heatsink clamp
> isn't necessary, since I won't run these at full output to test, except
> maybe only for a second or two. And they're thermally compensated -- you
> have to really work at over-currenting these devices to fry them.
>
>
> 73
>
> Jim NOTQ
>
>
>
> On Tuesday, October 29, 2013 5:48 PM, Todd F. Carney / K7TFC
> <k7tfc@arrl.net> wrote:
>
>
>
> On Tue, Oct 29, 2013 at 11:49 AM, Jim <n6otq@yahoo.com> wrote:
>
> The idea here is to batch-test so that I don't have to get
out
> the clip leads and other pieces every time I want to use one of these
> parts from the junk box. After a few times of jury-rigging a test set,
> I'll have used up the time needed to build a jig.
>
>
> Jim,
>
> I see your point, of course. Since all my test equipment, leads,
> fixtures, etc., are always set up and ready to go, for me it's easier to
> test on the fly.
>
> I've been thinking about a tester for regulators all day, using an
> Arduino or other MCU of course. I might just mess with that idea tonight
> for a little change from a frustrating troubleshooting project.
>
> 73,
>
> Todd
>
>
>
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On Tue, Oct 29, 2013 at 11:49 AM, Jim <n6otq@yahoo.com> wrote:The idea here is to batch-test so that I don't have to get out the clip leads and other pieces every time I want to use one of these parts from the junk box. After a few times of jury-rigging a test set, I'll have used up the time needed to build a jig.Jim,I see your point, of course. Since all my test equipment, leads, fixtures, etc., are always set up and ready to go, for me it's easier to test on the fly.I've been thinking about a tester for regulators all day, using an Arduino or other MCU of course. I might just mess with that idea tonight for a little change from a frustrating troubleshooting project.73,Todd
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The idea here is to batch-test so that I don't have to get out the clip leads and other pieces every time I want to use one of these parts from the junk box. After a few times of jury-rigging a test set, I'll have used up the time needed to build a jig.
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Has anybody ever built test jigs for either potentiometers or TO-220 semiconductor devices?
I have a bunch of old pots that need testing, as well as dozens (maybe hundreds) of LM-317 and 780x style voltage regulators.
Jim,Here's just a thought . . . don't test them at all until/unless you go to use one.For myself, I've got so much surplus stuff, and so little time to devote to projects, that I can take a few minutes (or less) to test something before it goes into a project. When I do, I rely on a few of those Chinese test modules from eBay, or just a DVM. It might be worthwhile to spend a little time putting together a simple test board for the regulators. It might make a niffy little Arduino project you could pull out when you need it.73,
Todd------------------------------------------------------------------------------------K7TFC / Medford, Oregon, USA / CN82ni / UTC-7 (PDT)------------------------------------------------------------------------------------
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Has anybody ever built test jigs for either potentiometers or TO-220 semiconductor devices?
I have a bunch of old pots that need testing, as well as dozens (maybe hundreds) of LM-317 and 780x style voltage regulators.
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