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
---In Amateur-repairs@yahoogroups.com, <amateur-repairs@yahoogroups.com> wrote:
Hi Todd
One problem that's common to both the TO-220 parts and the potentiometers is that they're all RFE -- "removed from equipment" and as such don't have perfectly straight, clean leads. If that were the case, at least on the TO-220s, I could simply use a ZIF socket and move the connections when I wore out a set of 3 holes.
Similarly, I could wear out a plug-in breadboard, 3 holes at a time. If you've ever had a worn-out plug-in board, you know what a nightmare this becomes. I know how to fix them, but having learned how to fix them I prefer to build dead-bug style or make a PCB for my prototypes.
For this application, sockets really won't work because none of the leads are factory-new. Instead, I'm looking for a clamp-style technology because it'll be much more tolerant of messed-up leads. I'll probably have to get out the epoxy and little bits from the junk box and invent a clamp fixture.
I was kind of hoping to find somebody who'd done large-volume incoming test on components, and pick their brain a little, and maybe suggest a commercial fixture that'd save me several hours of inventing.
Incidentally, saving a few hours in NOT having to-re-invent a fixture, nor repair it every few dozen devices, will be a godsend for me. I'm not kidding about how many of these things I have.
Maybe I'll test the electronics I build with a socket, using the stick of 48 new LM7808s I have. Then I'll let everybody know how well that worked and how long it lasted...
73
Jim N6OTQ
One problem that's common to both the TO-220 parts and the potentiometers is that they're all RFE -- "removed from equipment" and as such don't have perfectly straight, clean leads. If that were the case, at least on the TO-220s, I could simply use a ZIF socket and move the connections when I wore out a set of 3 holes.
Similarly, I could wear out a plug-in breadboard, 3 holes at a time. If you've ever had a worn-out plug-in board, you know what a nightmare this becomes. I know how to fix them, but having learned how to fix them I prefer to build dead-bug style or make a PCB for my prototypes.
For this application, sockets really won't work because none of the leads are factory-new. Instead, I'm looking for a clamp-style technology because it'll be much more tolerant of messed-up leads. I'll probably have to get out the epoxy and little bits from the junk box and invent a clamp fixture.
I was kind of hoping to find somebody who'd done large-volume incoming test on components, and pick their brain a little, and maybe suggest a commercial fixture that'd save me several hours of inventing.
Incidentally, saving a few hours in NOT having to-re-invent a fixture, nor repair it every few dozen devices, will be a godsend for me. I'm not kidding about how many of these things I have.
Maybe I'll test the electronics I build with a socket, using the stick of 48 new LM7808s I have. Then I'll let everybody know how well that worked and how long it lasted...
73
Jim N6OTQ
On Wednesday, October 30, 2013 1:14 PM, Todd F. Carney / K7TFC <k7tfc@...> wrote:
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)------------------------------------------------------------------------------------
__._,_.___
| Reply via web post | Reply to sender | Reply to group | Start a New Topic | Messages in this topic (10) |
TO UNSUBSCRIBE: login to groups.yahoo.com, select group amateur-repairs, click on "leave group" on right side of screen and follow instructions. PLEASE do not send UNSUBSCRIBE messages to the list.
.
__,_._,___
No comments:
Post a Comment