Hi Frank,
I've found that the "CPT" power supplies are not all created equal. It
would seem the manufacturers figure since it's hidden in potted epoxy, no
one can see what was actually used!!!
Early "CPT" power supplies that I purchased worked GREAT! And, I
recommended them for HamVoIP RPi2/3 users (this pre-dated the RPi4). Then,
I got some more batches of these supplies that they were junk--they ALL
failed, in time. Grrrr.
I dug one of these older "CPT" units open one afternoon, and found this
exact board hidden inside:
Here is the converter chip datasheet:
Anyhow, my reasoning for avoiding the "CPT" modules is that you can't tell
what you're actually getting, which is disappointing, because the potted
converter modules have a very nice form factor.
73, David KB4FXC
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On Mon, 4 Jan 2021, Frank Perkins wrote:
Hi Kevin,
On the one David suggested (board only), one of the views describes a
heatsink should be installed on the chip (see pic) if the intended load
would exceed 2.5 amps.
Since all the info dynamics of these rascals are the same, I'll bet they
incorporate that same board, but the "failing" units didn't have the
heatsink.
Just a thought.
Frank N6CES
On Mon, Jan 4, 2021, 5:13 PM Kevin Custer <kuggie@...> wrote:
I've had LOTS of failures with these "CPT" units. They are packaged very
nicely, but we've seen lots of issues / failures.
The ones David mentioned are way better IMHO:
Kevin W3KKC
On 1/4/2021 5:06 PM, dshack@... wrote:
DC-DC 12V to 5V Mini/Micro/A type Single USB Converter Step Down Power
Module | eBay
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