When you say 'blow' are you saying it short circuits internally or open
circuits internally due to the event ?
Adrian Fewster
On 20/4/20 8:07 am, Christopher Hoover wrote:
You might want to replace the bridge rectifier in that new 35A power supply.
Yep, right out of the box.
At some point, Astron started shipping RS-35A's with a 25A bridge
rectifier. They paralleled two out of four of the 25A diodes twice over
to make, supposedly, a pair of 50A diodes for center-tapped full-wave
rectification. That's not good engineering practice as the diodes in each
pair will not share current equally because of differences in Vf and
tempco. Once one blow, the other will blow shortly after.
After I fixed my own RS-35A with this problem, I've helped several other
hams fix this same problem in theirs. Not a random sample, as this is just
folks on my local machine and in local clubs.
You can get a 50A bridge in the same package for under $3.
Perhaps Astron has fixed the problem since ....
73 de AI6KG -ch
On Thu, Apr 16, 2020 at 10:28 AM Ray Albers <rayalb...@gmail.com> wrote:
Many to all who posted/responded to my recent post about an electrolytic
capacitor failure in my power supply. Lots of very interesting reading
about peoples' industry experiences - thank you!
Several have pointed out that using a 20A supply with my K3/100 is pushing
close to (or over!) the limit. Even though I am measuring just 16A at the
power level I'm running (and not running anything but the K3 on this
supply) I agree that I'm skirting the edges. So even though I've been
getting away with it for a long time, this morning I ordered a 35A supply.
I'll probably sleep better.
73
Ray K2HYD
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