Re: Regulator - 12vdc to 5vdc for Raspberry Pi
|
Hi David, About 30min before I read Kevin's text, I purchased two "Car Powered Technologies" units for $13. See pic. The other ads clearly showed just the letters CPT on the label. Unfortunately, I didn't make the connection it was the same outfit. So hopefully they're not potted, and I'll crack one open and see if there's a way to stick a heatsink on the chip. I'll keep you posted. I likewise will use it on a Pi3 with Hamvoip Allstar. Presently using the wart that came with the Pi, but want all my repeater power except fan to be 13.8vdc. Frank N6CES
On Mon, Jan 4, 2021, 6:30 PM David McGough < kb4fxc@...> wrote:
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
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
> > <>
> >
> >
> >
> >
>
>
>
>
>
>
|
