Electronics > Projects, Designs, and Technical Stuff

Breadboard Test Leads

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Pitron:
A couple of months ago, designed some custom test leads for a solderless breadboard. They are 4mm Banana plug to male Dupont 2.45mm test leads. They are perfect for connecting a multi-meter or power supply to a solderless breadboard.

I am having the test leads custom manufactured and I’m reselling them on my project’s website.

I would like some feedback on this idea before I invest too much money into it. Thanks

Project Website: https://www.pitronllc.com

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Update:

 I decided to turn Rev2 Banana Breadboard Test Leads into an Opensource Project.

This project is licensed under Attribution-ShareAlike 4.0 International (CC BY-SA 4.0). https://creativecommons.org/licenses/by-sa/4.0/

Once the design is complete, I will register this project with Open-Source Hardware Association. https://www.oshwa.org/

Also, I plan to upload the final design files to GitHub. https://github.com/PitronLLC/Pitron_Banana_Breadboard_Test_Leads

Ian.M:
Your design puts a lot of leverage on the duPont pin, which if its the crimp type isn't particularly robust, and on the breadboard contacts, which is why I and many others who have made something similar prefer to use much thinner and more flexible wire.   Personally I use 3" extension adapter cables that fit over my ordinary DMM probe tips with duPont pins on the other end.  If anyone is looking to DIY themselves, the female Molex 5 1/4" drive power contacts fit nicely over most meter probe tips.  Discard the shell and use heatshrink to insulate.

Pitron:
Hi Ian.M, thank you for your reply.

The heads of the test leads are made of steel needles specially used for injection molding. They are more robust than the regular DuPont pins. DuPont pins are 0.65mm in diameter, the test leads are approximately 0.8mm. They fit perfectly in a breadboard and I haven’t had any issues with them bending. 

I agree that I should use a thinner wire.

I am planning on designing a second revision of the breadboard test leads. On the new design, I’m going to use a smaller wire gauge (20 or 22 AWG). I’m considering changing the wire material from PVC to silicon. Since silicon is more flexible and easier to work with.

Also, do you think $17.98 is a reasonable price for a set of test leads?

Thanks again for your feedback.

tggzzz:

--- Quote from: Pitron on June 29, 2022, 01:33:28 am ---Also, do you think $17.98 is a reasonable price for a set of test leads?

--- End quote ---

I have no comment on the general design, since I loathe solderless breadboards.

However, there is a general point about pricing: what's the cost of achieving similar objectives by other means?

In this case my first port of call would be a standard (i.e. cheap, multisourced, and maybe already available) lead with a banana plug on one end and a small croc clip on the other. I'd attach the croc clip to an offcut of wire or component lead.

Ian.M:
For price comparison, see what Walmart can do for your price-point:
https://www.walmart.com/ip/Meterk-Multimeter-Test-Leads-Kit-21PCS-Digital-Electrical-Probes-Set-Alligator-Clips-Mini-Grabber-SMD-IC-Hook-Electronic-Lead-Kits/784565904

If your customers are price-sensitive you've already lost.  :(

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