What cables are they?

Other Hardware General Electronics
1

Hello, I am looking for two cables. One is the power cable-adapter (the white plug with open ended black and red wires) shown in the photo. Another is some kind of extension cord for the T-connector with two thick gold plugs (I guess one end female to connect to the board and another end male to connect to the LIPO battery).

For these two cables, do I need to concern about the type/thickness of the wires? Could you please tell me the name for these two cables and good place to buy them? Thank you.

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2

OPs diagrams
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3

If you are looking for a place to buy them, why are you concerned about the wire size?

If you know the current carrying capacity for the wires, there are web sites that list the current carrying capacity of wire sizes.

Most likely you will never be able to find the exact cables you want because they were made by the same factory that made the boards. An important skill in life is being able to make your own cables.

Paul

4

Is there a name for the kind of white connector shown in the photo? I think the red one is called T connector.

5

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Is there a name for the kind of white connector shown in the photo? I think the red one is called T connector.

Name? Probably not. But somewhere there is a manufacturer and a part number. Is there something molded on the connector? On the board?

Paul

6

I recognize the red connector from my radio control hobby.
Deans connector is the name.

The white ones might be referred to as JST plugs.

7

The white one is a generic "JST" variant. The black one is a co-axial power plug likely 2.1x5.5mm.

8

I think JST is good. For 4.5A, should I go for AWG 14 or 15? When getting a new connector and make my own cable, what parameters do I have to be concerned with? Thanks

9

I think JST is good. For 4.5A, should I go for AWG 14 or 15? When getting a new connector and make my own cable, what parameters do I have to be concerned with?

I think 4.5 amps is kinda like a Max rated, you should apply some safety margin to that number.

  1. Make sure the mating contacts have the same plating as the one on your board. Gold with gold and tin with tin. Mixing them is not going to be reliable.

  2. Connectors rely on the wires to pull the heat away from the contact area. The larger the wire, the more heat can be conducted away and the more reliable the contacts will be. So even if your application does not require a heavy conductor, the connector will appreciate it.

Having said that, I would be surprised if you can get a contact for that connector (white JST) for a 14 AWG wire.

10

Thanks. For the "margin", do you mean rounding the 4.5A down, to say the 4A?

Which is the most reliable current to AWG table? I recall that two days ago, I encountered a table which corresponds to twenty-something AWG. Why there is such a big difference?

11

Here I have found a working tips which is use in system.

12

Sigh...

"Wire gauge current chart" on google brings me a full page of results, all of charts with exactly the information you are asking for..

That said, JST seems to spec 3A max for those connectors, assuming 20awg wire... https://www.jst-mfg.com/product/search_e.php?type=1&id=1&page=4

13

That white one looks like a JST XH connector, those are rated 3A, and can be used with wires up to 22 AWG (0.32 mm2).

22 AWG can comfortably handle about 6A - of course the length of the cable (and with it the losses) matter as well.