Resistor Tester Stand

by Elproducts Jul 15, 2016
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I like this Thing, but the picture shows the terminal holes low and the file has them high to the top of the cutout on the inside. There is no room for a nut and terminal post on the inside.? Any options for an AA or AAA battery tester.?

Watch the video. I didn't use a nut. They fit tight in the hole and are soldered.

No plans for a battery tester at this time.

Thanks Chuck for a great little tool.Only just starting to learn electronics and the eyes arent real good at this middle age(lol) so this makes it so much quicker to sort through those pesky Resistors.
I had to modify your design a little bit just to take the Banana sockets I had,couldnt get the nuts on with your cutouts and no heavy copper wire so I used 3mm brass rod instead.
Works a treat

I love this design and plan on making a couple for my school's Digital Logic course! Has anyone tested the connectors that are linked in the Thing Details (http://amzn.to/29Snfci) and if so did they work? If not what modifications did you make to design to allow them to fit?

I look forward to printing this soon!

First, I really like this idea. Only problem is I probably couldn't find it on my bench when I really need it.

I first started in electronics more than half a century ago, so, as the insurance commercial on TV says, "I know a thing or two since I've seen a thing or two". (I've also worked in electronics factories, both as a tech and an engineer.)

(I'm going to mention this so folks are aware of the issue...) To get an accurate measurement for resistances below about 10 ohms, you need to use a 4-wire set up rather than a 2-wire set up, though this usually requires a much more expensive meter. Your "gadget" could likely be modified to 4-wire, but the need is rare for most people.

In my experience, for resistors greater than a few tens of ohms, even the cheapest of digital meters (e.g., one you get "free with any purchase and a coupon" from Harbor Freight) is plenty accurate for identifying resistors.

Old resistors (e.g., >20 years) can sometimes "shift value" with age, so checking them with a meter is a good idea, even if your eyes are young enough to read the color code reliably.

Also, if you could get "raw, unsorted" resistors off the production line, and plotted the actual values, you'd get a bell curve centered around the "nominal" value. However, most manufacturers sort BEFORE marking. They'll take out the ones that are +/- 1% (usually, they'll use some "guard band", so they will actually take something like +/- 0.9%) and mark them as 1%, then take ones remaining that are +/- 2%, and mark them as "2%", then out of the remaining ones they'll take the 5%, and so on. The exception is if they happen to have orders for lots more, say, 5%, they may take the "2%" and mark them as 5%. (Today, many resistors are laser trimmed to the value. They can set the trimmer to "aim" for a specific tolerance, and the tighter that tolerance, the slower the trimming. I worked on such a machine back in the mid-70s, and we had one part that needed 0.025%, and it took about 20 seconds per resistor, while a 5% would take about 0.1 seconds IIRC.)

One last thought: using a non-conductive object to hold down the resistor while measuring it, can improve accuracy a bit. Skin is somewhat conductive. A good solution, IMHO, would be to print non-conductive tweezers to hold the resistor while measuring it.

Thanks. I'm aware of most of that but this was just a fun project to help sort resistors and help an old set of eyes. It worked great. I don't expect anybody to take it that serious. It's a hobbyist tool. Besides, after 40+ years of electronics experience myself, I've rarely used resistors below 10 ohms so this is designed for the larger sizes. I've got multiple meters so this one will stay connected to one of them. Touching it with a finger will barely affect most values but I touched the plastic casing not the leads. I'm sure others will come up with pivoting weights to make it human error free. Thanks for the feedback.

I was wondering if resistors simply lying on top is enough of a positive electrical contact. Maybe for large values of R, for sure, but proof would be in the pudding. Some kind of "pinching" action might help, but the whole point of your thing is to swap resistors in and out quickly. I'll give it a go. Great idea, my eyes are no good for colour codes anymore, if they ever were (I'm also colour blind).

Hi Chuck, video is set to private.

I guess you will publish it later today

It was suppose to go public at 9am EST but it didn't. Its now public.

What an excellent idea! Nice job!