Electronics > Projects, Designs, and Technical Stuff

Adapter Box for (all) your Lab needs

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dangrie:

--- Quote from: t1d on November 10, 2018, 08:21:13 pm ---
--- Quote from: dangrie on November 10, 2018, 03:34:27 pm ---I don't quite understand what you mean by multi-connection type? Do you mean 2 Banaplugs in 1 Case with the standard spacing?

--- End quote ---
Look at the third/down picture of the "Multi-Connection Banana Socket," in my prior post. Look at the one with the nut raised. You will see that you can insert a wire, into the hole in the post, and tighten the nut, to secure the wire. With the grommet-style Banana Connector that you have specified, you do not have that additional option. Does that make sense?

If you make space for the multi-type, the grommet type will be accommodated, too, and the user can choose whichever they like.

--- End quote ---

Thanks. I will make sure to leave enough space so one can fit whichever socket they prefer :)
Do you have a link or Part# for the posts you used? they look awesome.


--- Quote from: t1d on November 10, 2018, 08:48:59 pm ---For either style, you presently have...
+  +
-    -

This orientation would give more options...
+  -
-   +

--- End quote ---

Thats a good point, going to update the board right now. Having more options is kind of the whole reason for the box.


--- Quote from: gdewitte on November 10, 2018, 03:38:44 pm ---I recently built something similar (and also based on the Monsieur Adaptateur that I had purchased a few years ago and found very handy). I ditched the BNC figuring I could always use one of those BNC-to-banana plug adapters if needed, and added an Anderson Powerpole panel mount.

--- End quote ---
Great, do you have som pictures? Do you know of any PCB-mount poles? However, I think I'm too limited in space with the form factor I'm targeting.


--- Quote from: Conrad Hoffman on November 10, 2018, 09:29:15 pm ---It needs a couple male banana plugs sticking out the side so you can plug it into meters and such. You can also cheat and put an SO-239 female UHF connector on it, with a female banana jack 3/4" away. That gives you the 239 plus the ability to accept 3/4" dual banana plugs using the center of the 239.

--- End quote ---
I thought about that but ditched the idea since this would mean I would always have sticking out poles connected to potentially high voltage and always risking shorting them. So I decided to just plug in a banana-cable to connect to meters and power supplies.


--- Quote from: Gixy on November 11, 2018, 07:50:45 am ---I have Something very similar. As I use it mainly for power supply connections, I have no BNC plug but USB female socket instead, and a LED to indicate power on.

--- End quote ---
USB may be a good option, I will check if I can fit it nicely. BNC is kind of important for me, since I have lots of BNC cables with different ends I can use for probing and now also powering, etc.

I also thought about the LED. How do you drive it with the varying input voltages? I thought about using an LM234 as a constant current source over a wide voltage range (certainly the 2-30V I use 99% of the time). It would also be protected up to 20V of reverse voltage which would help keep the circuit simple.

t1d:

--- Quote from: dangrie on November 11, 2018, 01:52:54 pm ---Do you have a link or Part# for the posts you used? they look awesome.
--- End quote ---
This is what I bought. They were the cheapest, at the time. But, I see some cheaper, today. So, shop around.

Also, there are a lot of different styles, of this same thing. I think I started with a search for "Speaker Banana Jacks." Adding "Speaker" seems to narrow the search, better.

https://www.ebay.com/itm/Banana-Plug-Terminal-Connector-Amplifier-Jack-Audio-Speaker-Adapter-Dual-Cable/282398851657?ssPageName=STRK%3AMEBIDX%3AIT&_trksid=p2057872.m2749.l2649

gdewitte:
Here are two pictures of my home-built version: one 3/4 view showing the Powerpole panel mount end and the other 3/4 view showing the 5.5mm DC jack panel mount end. The box is a Hammond 1591 I had originally purchased for another project. I replaced its top cover with a piece of PC project board (ground plane on one side and solder pads on the other; I cut a length-wise break in the ground plane with my Dremel to make positive and negative sides). The Powerpoles use Anderson Autogrips from Hardened Power Systems (https://www.portableuniversalpower.com/our-products/anderson-autogrips/) for the panel mount.

t1d:

--- Quote from: gdewitte on November 11, 2018, 05:41:17 pm ---I cut a length-wise break in the ground plane with my Dremel to make positive and negative sides).
--- End quote ---
Really nice job!

I take it that you just cut through the copper and not completely through the board. I think the line down the middle, that I am seeing, was made with a marker, as opposed to it being a cut's shadow... Correct?

gdewitte:
Correct: only milled through the copper on the ground plane side; the line on the pad side was for reference.

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