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Re: Soldering.

Postby wireman » Sun Jun 21, 2020 4:31 pm

I decided to build a DC load box to test a couple of power supplies.

I got a nice 190x110x60mm Aluminium box and a load of high-power resistors from ebay.

The resistors are riveted to the box and 6 4mm connectors provide combinations of resistors to give...

10Ω @ 500W
20Ω @ 100W

along with connections to a

100°C Thermostat

Of course in practice it is best to limit the main load to 200W for a short time.

At the last minute I changed from the 4mm connectors I had been using which I like but need a 12.2mm hole.

I chose these...

Image

Wired it all up, started testing and then my error dawned on me.
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Re: Soldering.

Postby MOF » Sun Jun 21, 2020 5:01 pm

I presume the error is that they will only work with a plastic (non-conducting) box.
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Re: Soldering.

Postby wireman » Sun Jun 21, 2020 5:07 pm

MOF wrote:I presume the error is that they will only work with a plastic (non-conducting) box.

That's right, unless you want an expensive way to get 0Ω

Had to unsolder, replace all the sockets, resolder.
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Re: Soldering.

Postby Folderol » Sun Jun 21, 2020 5:16 pm

Commiserations. However, I'd have been inclined to cut a piece of tuffnol as a panel, and mount them on that.
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Re: Soldering.

Postby blinddrew » Sun Jun 21, 2020 5:28 pm

Ah yes, made a similar error with a guitar pedal power supply once.
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