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Originally Posted by bloodhound31
Well, I am certainly going to be more careful about who I listen to now.
I went out and bought a 13.8V, 23Amp power supply from Dick Smith that was supposed to meet the requirements.
My fans and peltiers draw a combined 19.1 amps. I was told by many that these devices will only draw as much as they need from such a supply.
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Yes, this is exactly right. Look at the specs of the peltiers - 6A *each* plus a bit for the fans.
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Upon hooking it up however, the power wire to the scope got warm, then hot and within seconds was a smoking ruin. All the wires inside the scope were warm too, totally defeating the purpose of cooling the thing down.
Conversley, what seems to be a grossly underpowered second hand old computer power supply with a 8 Amp flow, (see previous pictures with blue spec. label) works fine. And it cost me nothing.
I now have a brand new Laboratory grade power supply that appears to be of no value to me.
We live and learn huh? Who would have thought?
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Barry, I'd read the results of this test slightly differently...
From what you describe here, the big power supply did its job wonderfully and was able to supply the required 19A or so, and it was the thin wires that connected other parts together that let you down.
The 8A computer power supply is probably not able to supply the required current and so the wires aren't getting hot enough. But the downside of that is that the cooling is probably running at about 30% of its capacity.
The best solution may be to re-wire with heavier wiring and then try the big power supply again.
cheers, Bird