mountable power ports

Mar 26, 2025 Last reply: 1 year ago 24 Replies

Hi, my project box is a large tin cookie box. I need to bring in +15V,



-15V, and GND lines from my external bipolar power supply. (I was thinking I would have a separate bolt for the chassis ground, which would go off to a big ground bus bar near my workbench.) For the three lines from the power supply, I am wondering what would be the best (but economical) choice for a power connector to mount into the side of the project box. Something that sounded appealing was the spring speaker terminal clips I see on Amazon, but the downside there is they only come in pairs of two or four, rather than three, and they are color coded red/black which does not quite make sense here. I am inclined to leave the wires on the power supply itself bare on the end, rather than attaching some specialty connector to those.


there are million of different connectors, leaving the wires bare is just asking for getting the connections wrong ..

Stereo phone plugs and jacks are nice connectors.

What cookies did you use? I like the big Danish Butter Cookie cans, except that you have to empty them before you can put electronics inside.

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I second this.

Screw pillars with 4mm banana sockets in the centre. Available in a wide range of colours, rated to 500v and 10 amps. Easy to fit, easy to plug-up and easy to see what you are doing so you don't make silly (and expensive) mistakes.

Use matching colour-coded wires and plugs, so there is even less chance of a screw-up.

with the added "benefit" of shorting out when you plug or unplug ;)

Sure. A tiny little spark never hurt anybody.

I once wired a building for RS-232 ruins everywhere, to dumb terminals from a DEC timeshare computer. I used phone plugs and jacks. You can step on them without damage, and you can mate and unmate them in the dark, by feel.

USB should be so friendly. It ain't.

We are just talking about something simple like this, right?:

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They would be perfectly satisfactory if you were happy just using plugs. If you wanted the option of using bare wire ends, you could try:

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For a more up-market version, I have found these to be very reliable over decades of abuse:

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I like the shorties.

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They mount nicely on PC boards too.

If its rather low current, coaxial power plug and Jack, or even a 1/4" stereo Jack. I prefer the binding posts.

Cheers

It's one of the physical constants of this universe that banana jacks are always 0.75" apart.

They are not round, but Anderson Powerpole connectors can be very useful. The ground connector mates before the other ones and they can be built up into various multi-contact combinations.

The current rating may be overkill for many projects, but they are versatile and reliable.

John

...except in pre-war Netherlands, where they were 1-inch apart.

Surely you mean one meter.

But which war?

No; meters were very expensive in those days, most people didn't own one. :-)

1939 - 1945.

Snark.

Jeroen Belleman

Well, they are banana jacks, so they have to be usable by monkeys. (*)

Cheers

Phil Hobbs

(*) Ancient IBM joke: “Our machines are so easy to service that a monkey could do it!” “Is this a one, two, or three-banana job?”

(The “🍌🍌🍌job” became proverbial.)

Past my time, although my dad fought (or actually typed) in the Pacific in that war.

I was in the US navy for a week once, and was drafted for the Viet Nam war, but never actually served.

The sign around IBM was

THINK

or thwim

I think I'll thwim. I thruggle and emerthe.

Jeroen Belleman

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