resistor matrix for dummy load...

[John Larkin]

On Tue, 13 Jun 2023 05:09:22 GMT, Jan Panteltje <alien@comet.invalid>
wrote:

On a sunny day (Mon, 12 Jun 2023 12:24:10 -0700) it happened John Larkin
jlarkin@highlandSNIPMEtechnology.com> wrote in
4pre8ilnovvis410t9g535pvsmpvehq14s@4ax.com>:

The stand-up 5-watt square resistors are easy to insert and to
automated solder. The question is, how hot will the PCB get vs power
per resistor, at some given air flow?

https://www.digikey.com/en/products/detail/te-connectivity-passive-product/SQMW51R0J/2365645

I don\'t really mind the resistor surface getting very hot.

One worry would perhaps be these resistors un-soldering themselves, causing bad solder joint.
I have seen transformer pins unsoldering in TV sets.

And soldering-type temps will damage the board and other components.
The power resistor pads will have to be giant on layers 1 and 6, to
transfer heat into the copper planes on 2 and 5.

Personally I would move power resistors to a heat sink.
Have peeseebees become a religion?

Heat sinks are big and expensive, and I\'d have to mount my many
resistors to the heat sinks. That\'s messy and labor intensive.

Peeseebees are cheap and can be machine assembled in panels.