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Topic: DIY circuit test points, what do people use? (Read 1 time) previous topic - next topic

travis_farmer

i was browsing around eBay, looking for ideas for test points for my logic analyzer and oscilloscope.

mainly, i was tired of clipping the J-grabber onto a DuPont hookup wire, and touching it to just the right spot, or clipping it to a jumper wire with the insulation stripped a bit. i just like to test my circuits at various points to make sure things are as expected, after soldering them up. i figured, once i start milling my PCBs, i won't have as many jumper wires to clip to.

predominantly, i found the test points that are just a loop of wire, with a glass or ceramic bead for an insulator/spacer. i found them to be cheap enough, but not with the color-coded selection i wanted. it occurred to me, i could probably use small glass art/jewelry beads with a small loop of wire. but i am not sure if the beads have a big enough hole (anybody use them for anything?).

thoughts? ideas?

~Travis
My GitHub: https://github.com/travisfarmer?tab=repositories
My website is where i organize my thoughts and ideas. feel free to visit it (http://tjfserver.ddns.net/).
Arduino Talk Radio: http://travisfarmer.caster.fm/ (if i am on-air)

larryd

I often use two connected pads, side by side, add and solder a loop of wire between the pads.
Or
Install a male header pin to a pad, use female header pins on the probes wires.

.
No technical PMs.
The last thing you did is where you should start looking.

travis_farmer

Hmm, simple but effective.

only reason i was thinking of the beads was for color coding, but i guess i can't imagine i would make a circuit big enough that i would have that many test points. perhaps i was overly complicating the issue (not that i ever do that :D )

Thanks for bringing my head back down to ground level ;)

~Travis
My GitHub: https://github.com/travisfarmer?tab=repositories
My website is where i organize my thoughts and ideas. feel free to visit it (http://tjfserver.ddns.net/).
Arduino Talk Radio: http://travisfarmer.caster.fm/ (if i am on-air)

TomGeorge

Hi,
If I realise that a test point is going to be at the end of a resistor, not SMD, I lift the resisitor slighly off the PCB before soldering so a probe hook can slip under the resistor lead.
Or make a 360deg loop in the resistor lead before soldering it in, if enough room.
Or mount the resistor vertical, so the test point is the upper U bent wire.

If I'm using strip or vero board then its easy to make a loop out of the board with a bit of component lead offcut.


Tom.... :)
Everything runs on smoke, let the smoke out, it stops running....

travis_farmer

Hi,
If I realise that a test point is going to be at the end of a resistor, not SMD, I lift the resisitor slighly off the PCB before soldering so a probe hook can slip under the resistor lead.
Or make a 360deg loop in the resistor lead before soldering it in, if enough room.
Or mount the resistor vertical, so the test point is the upper U bent wire.

If I'm using strip or vero board then its easy to make a loop out of the board with a bit of component lead offcut.

Tom.... :)
Hmm, good tip, using a resistor (if available where a point is needed).

having a logic analyzer now, will make it easier to debug, but will take some extra schematic and board planning to make sure i have something to grab onto.

I used to bloat an Arduino application with various debugging code, but now i can see exactly what the direct result is, thus negating the need for most of the extra lines of code. :D
I do kinda wish the test leads for it were longer (6" of wire). but i can probably just get some Dupont crimp pins (male and female) and make a few extensions.

~Travis
My GitHub: https://github.com/travisfarmer?tab=repositories
My website is where i organize my thoughts and ideas. feel free to visit it (http://tjfserver.ddns.net/).
Arduino Talk Radio: http://travisfarmer.caster.fm/ (if i am on-air)

RichardBronosky

I just solved this need! Check out https://forums.adafruit.com/viewtopic.php?f=8&t=133348&sid=06af3be4ee62d572e7e381720049f37c#p663460




TomGeorge

#7
Apr 07, 2018, 03:51 am Last Edit: Apr 07, 2018, 03:52 am by TomGeorge
Hi,
If you need to edit anything in your post, you can by looking at the bottom right hand side of your particular post and click on "Quick Edit More" , "Modify".

As you now have two posts, you can "Remove" the first one if you like.

Tom... :)
Everything runs on smoke, let the smoke out, it stops running....

travis_farmer

Quote
I just solved this need!
so, the subject line is regarding "DIY circuit test points", and the solution is to purchase pre-made ones?  :smiley-confuse:

just thought i would point out this bit of humor. ;)

~Travis
My GitHub: https://github.com/travisfarmer?tab=repositories
My website is where i organize my thoughts and ideas. feel free to visit it (http://tjfserver.ddns.net/).
Arduino Talk Radio: http://travisfarmer.caster.fm/ (if i am on-air)

Henry_Best

so, the subject line is regarding "DIY circuit test points", and the solution is to purchase pre-made ones?  :smiley-confuse:

just thought i would point out this bit of humor. ;)
The circuit is DIY, the test points aren't. 
Or do you make your own resistors, capacitors, transistors, etc., etc.

travis_farmer

perhaps i should have titled the subject "DIY test points for use in circuit".
regardless, back when i posted this thread, in July of last year, i got the answers i needed, so it must have been interpreted correctly then. ;)

~Travis
My GitHub: https://github.com/travisfarmer?tab=repositories
My website is where i organize my thoughts and ideas. feel free to visit it (http://tjfserver.ddns.net/).
Arduino Talk Radio: http://travisfarmer.caster.fm/ (if i am on-air)

Qdeathstar

i don't know, everyone wants to make things because they think it will be cheaper/better when actually, more often than not it's better and cheaper to buy something off the shelf.
A creaking creeping shadow
stiff against the freezing fog
glares at a tickless watch.

Time has failed him -- all things shall pass.

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