Pevono PS305 Review, Teardown, and Bench Test

The Pevono PS305 review unit that I was shipped proves to be a well-built and affordable DC bench power supply. From its aluminum construction to its display accuracy, the Pevono PS305 is a great bargain lab power supply! In this video, we’ll teardown the Pevono PS305 power supply and see how it’s constructed as well as bench test it against is published specifications.

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PS305H (4-digit display):

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00:00:00,439 –> 00:00:05,490
Pevono PS305 DC power supply is it
worth it

00:00:05,490 –> 00:00:15,590
let’s find out greetings programs Atari
here you there and this is a Pavano PS

00:00:15,590 –> 00:00:21,720
305 DC bench power supply now the folks
over Pavano they asked me would I be

00:00:21,720 –> 00:00:25,109
willing to do a review of their product
so they sent me one of these is a

00:00:25,109 –> 00:00:30,269
demonstration unit that they sent me so
you know so far out of the box it looks

00:00:30,269 –> 00:00:35,309
pretty decent a pretty decent build
quality it’s got these nice 7-segment

00:00:35,309 –> 00:00:39,540
display on the front and of course
they’re either LED lit so it’s got a

00:00:39,540 –> 00:00:44,789
nice look to it got your your voltage
and current adjustment to your course

00:00:44,789 –> 00:00:50,489
and it looks fine on this side and then
we’ve got your positive negative and a

00:00:50,489 –> 00:00:55,140
chassis crowd so let’s take her apart
and then let’s do it as a bench test and

00:00:55,140 –> 00:00:59,699
let’s see what we get so first things
first you have our ceremonial unboxing

00:00:59,699 –> 00:01:04,260
here the first thing we see is a pair of
leads here the banana clips and

00:01:04,260 –> 00:01:11,490
alligator clips we’ve got our our core
instruction manual but who’s really

00:01:11,490 –> 00:01:17,369
gonna read that and then of course the
main event here is my main unit packed

00:01:17,369 –> 00:01:21,650
very nicely and some styrene

00:01:21,990 –> 00:01:25,590
it’s best ik

00:01:27,980 –> 00:01:34,110
right there okay so we have our unit
here we have they’re nice and sturdy

00:01:34,110 –> 00:01:39,080
aluminum construction just go ahead and

00:01:51,230 –> 00:01:59,220
so start here back we’ve got our power
supply input and it is fused there is a

00:01:59,220 –> 00:02:05,130
fuse inside there a nice little switch
between 110 220 uses this

00:02:05,130 –> 00:02:11,850
internationally big beefy fan here on
the back our heatsink you know come in

00:02:11,850 –> 00:02:18,360
from the power supply back here now the
first thing I notice is that these these

00:02:18,360 –> 00:02:25,680
terminals are not insulated that to me
poses a problem just a safety issue I

00:02:25,680 –> 00:02:30,780
mean they’re in there nicely but just
don’t like seeing one insulated

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terminals on AC input got that and then
there is our chassis ground lead this is

00:02:36,690 –> 00:02:45,690
a hard switch directly over here to the
toggle switch on the front again not not

00:02:45,690 –> 00:02:49,980
insulated you can see how closely
together those those two toggles comes

00:02:49,980 –> 00:02:55,470
just any little bit of horse on there
that later on there and those two are

00:02:55,470 –> 00:02:58,650
going to bridge and we’re gonna have
four well I think what I’m going to do

00:02:58,650 –> 00:03:03,000
is put a little heat shrink on there and
just insulate these a little bit better

00:03:03,000 –> 00:03:09,690
and maybe I’ll do that in a future video
anyway so we’re coming back here here is

00:03:09,690 –> 00:03:16,620
the AC side verbal rectified beeping
capacitors up here too

00:03:16,620 –> 00:03:25,980
I’m all set transistors trigger on these
nice big heat sinks here so good

00:03:25,980 –> 00:03:33,330
looks like we have good heat dissipation
we got it’s actually a very clean board

00:03:33,330 –> 00:03:40,739
very nice it doesn’t look like it’s just
slapped – put together here we have the

00:03:40,739 –> 00:03:47,600
flat board you can see there we’ve got
our the driver for our LED displays a

00:03:47,600 –> 00:03:56,250
couple of pop trimmers for the accuracy
there on the display let’s see there’s

00:03:56,250 –> 00:04:00,510
our terminals there some good that
everything looks pretty good there it

00:04:00,510 –> 00:04:05,910
looks like this is some sort of noise
reduction got a couple of noise

00:04:05,910 –> 00:04:10,799
filtering capacitors here looks like
there’s actually a couple of spots for a

00:04:10,799 –> 00:04:16,200
couple more passengers but we’ll see
we’ll see what the noise is on these and

00:04:16,200 –> 00:04:21,870
maybe we’ll maybe we’ll play with that
another day having a look at the back of

00:04:21,870 –> 00:04:28,229
the board here and you can see where
this is the AC section and of course the

00:04:28,229 –> 00:04:32,070
rest of the DC section personally I
would like to see a little better

00:04:32,070 –> 00:04:36,180
separation here that’s I mean there’s a
good bit of you know there’s a good you

00:04:36,180 –> 00:04:41,000
know almost a fingers worth of
separation between the AC and DC sides

00:04:41,000 –> 00:04:47,250
but me just being the perfectionist I am
I would rather see some physical

00:04:47,250 –> 00:04:52,590
separation maybe a cut out just just to
give you a nice air gap little bit more

00:04:52,590 –> 00:04:58,370
safety over there separation there but
but this is not bad this is actually

00:04:58,370 –> 00:05:03,960
rather rather good build quality I’m
highly impressed with the quality of

00:05:03,960 –> 00:05:09,720
this build and so so far so good
looks like we’re gonna have a pretty

00:05:09,720 –> 00:05:13,560
decent little product here now she looks
pretty good on the inside

00:05:13,560 –> 00:05:17,760
couple of little things here and there
not anything that’s a deal-breaker and

00:05:17,760 –> 00:05:22,080
nothing I can’t fix myself which I’ll
probably do another video so go ahead

00:05:22,080 –> 00:05:27,390
and hit the subscribe button so you’ll
be notified when that comes out so now I

00:05:27,390 –> 00:05:30,270
guess what we really need to do is test

00:05:30,270 –> 00:05:36,510
against the specifications but I don’t
really have a proper bench testing setup

00:05:36,510 –> 00:05:41,550
right here but I do know a guy so we’re
gonna pack this stuff up we’re gonna run

00:05:41,550 –> 00:05:48,810
down the street and we’re gonna give her
a proper rundown

00:05:51,430 –> 00:05:55,820
okay so I’m here with our clients 23b
hackerspace here in Fullerton California

00:05:55,820 –> 00:06:03,580
I asked him if I could use the the
workbench here to to do a little more

00:06:03,580 –> 00:06:09,620
accurate measurements of this thing
little literal bench test if you will so

00:06:09,620 –> 00:06:14,240
Arclight show me what you got here yeah
so this is our double Yi electronics

00:06:14,240 –> 00:06:18,440
bench here we have a bench top DMM here
that goes to four digits it’s called the

00:06:18,440 –> 00:06:26,630
math tech 80 40 we have a rival ds-11 Oh
200 megahertz scope will give you sample

00:06:26,630 –> 00:06:30,140
should be pretty adequate for testing
you know power supplies things like that

00:06:30,140 –> 00:06:35,690
and of course we have absolutely an we
have already standard tests so we’re

00:06:35,690 –> 00:06:41,570
gonna measure some current we want to
see what kind of rip will get me any of

00:06:41,570 –> 00:06:46,010
that stuff voltage accuracy no problem
fantastic all right let’s get down to

00:06:46,010 –> 00:06:48,290
let’s do it the frequency to which you

00:06:48,290 –> 00:06:51,170
are to the present time is the one on
which you will normally receive civil

00:06:51,170 –> 00:06:54,740
defense information in the event of an
actual emergency okay so our Clyde has

00:06:54,740 –> 00:06:59,120
very graciously allowed me to use the
electronic shop here at 23 beta to check

00:06:59,120 –> 00:07:02,960
this thing out on the oscilloscope so
let’s hook it up and then and find out

00:07:02,960 –> 00:07:13,840
what’s going on here we’re going to look
up our leads here course light black and

00:07:13,840 –> 00:07:21,120

00:07:23,189 –> 00:07:27,149
okay we got our scope all set up and
we’ve got the power supply here it’s

00:07:27,149 –> 00:07:34,860
it’s pretty sad already to do 12 volts
so let’s see what it’s got see here a

00:07:34,860 –> 00:07:39,419
bit of a ripple going on with the
switching power supply a little bit of

00:07:39,419 –> 00:07:43,139
noise on the line there okay so now
let’s try this under load I’ve got it

00:07:43,139 –> 00:07:50,339
hooked up with a 10 watt 10 watt
resistor here 24 ohm let’s see see what

00:07:50,339 –> 00:07:55,050
we do with the 12 volts here we’re
running about 12 volts a half an amp

00:07:55,050 –> 00:08:03,119
here and it’s still got quite a bit of
noise in there even under load one other

00:08:03,119 –> 00:08:08,189
thing we really need to look at is the
voltage spike when it comes on it seems

00:08:08,189 –> 00:08:13,889
to be kind of seems to be a bit of a
spike when you turn it first on and that

00:08:13,889 –> 00:08:17,369
can be a problem with sensitive
electronics things like that so let’s

00:08:17,369 –> 00:08:25,739
take a look here and and see if there’s
any bad spike when it happens okay there

00:08:25,739 –> 00:08:31,800
we’ve got a nice little spike 20 volt
spike right there or it love this back

00:08:31,800 –> 00:08:35,579
off so this could be a problem if you
have sensitive electronics or anything

00:08:35,579 –> 00:08:40,370
like that so just something to be wary
of so don’t have your load connected

00:08:40,370 –> 00:08:46,050
before you turn it on turn it on and
then connect your load well here at the

00:08:46,050 –> 00:08:53,699
shop I might as well check the accuracy
with a much more accurate multimeter

00:08:53,699 –> 00:08:59,939
than what I’ve got at home this is a
mass Tek ms 84 T true RMS multimeter

00:08:59,939 –> 00:09:05,939
so it’s accurate to like 4 decimal
places something like that so we’re

00:09:05,939 –> 00:09:13,439
gonna check it out with this and so
let’s just go ahead and turn her on back

00:09:13,439 –> 00:09:20,130
down to stick it down to start it out
about 12 volts okay so we got 12 volts

00:09:20,130 –> 00:09:39,540
there and we’ll just check
voltage here still quite 0 and 0.0 0.0 4

00:09:39,540 –> 00:09:50,750
9 so fairly accurate – terribly bad ok
let’s take her up to the top end here

00:09:50,750 –> 00:10:06,900
toast about 24 volts that’s fairly
common 24 volts a 4.04 volts excellent

00:10:06,900 –> 00:10:14,250
so still fairly accurate here take her
all the way up to the top to the tippy

00:10:14,250 –> 00:10:24,590
tippy top fans kicking in a little bit
31.9 volts on the screen there 3196 so

00:10:24,590 –> 00:10:30,410
even still accurate up at the top
extreme now let’s take her down to the

00:10:30,410 –> 00:10:36,870
you’re gonna have the low end
let’s do about 3.3 volts actually let’s

00:10:36,870 –> 00:10:42,540
get 5 volts and make sure our five bolts
good working on electronics I’m usually

00:10:42,540 –> 00:10:51,120
working with 5 and 3.3 volt
you know logic and so forth so five zero

00:10:51,120 –> 00:10:59,250
two nine five zero three right there on
a 5.0 display let’s take it down to

00:10:59,250 –> 00:11:04,040
three point three three point three

00:11:05,470 –> 00:11:14,060
one three one seven on the RMS and then
she’s taking it all the way down to zero

00:11:14,060 –> 00:11:19,009
because the cool thing about this is
that actually does it will read zero or

00:11:19,009 –> 00:11:35,480
three and rolling down yeah it’s it’s
right at you know right around zero so a

00:11:35,480 –> 00:11:41,949
little linear is this there we go yeah
so we’re right down at zero now so

00:11:41,949 –> 00:11:46,249
fairly accurate across the entire
spectrum which is something you

00:11:46,249 –> 00:11:58,009
generally don’t see out of these cheapo
Chinese power supplies now I got my ten

00:11:58,009 –> 00:12:04,399
watt resistor here let’s let’s put her
under load and let’s see how accurate we

00:12:04,399 –> 00:12:09,139
are when we’re under load okay so now
we’re set up so that we can check the

00:12:09,139 –> 00:12:13,579
amperage accuracy so I got the whole
thing we got it running out of red and

00:12:13,579 –> 00:12:19,279
into a 10 watt resistor over here into
the multimeter and then back out and

00:12:19,279 –> 00:12:25,850
back into a negative side so that’s
let’s just take a look here we’ll start

00:12:25,850 –> 00:12:32,480
running it up over voltage a little bit
okay so let’s go to 3.3 volts 3.3 volts

00:12:32,480 –> 00:12:38,540
and showing one point four amps right
here and one point three point one three

00:12:38,540 –> 00:12:43,779
nine there okay I’ll take it up to five

00:12:44,319 –> 00:12:52,269
point two 1.20 eighths is still really
super close

00:12:54,149 –> 00:13:05,689
fans kicking in take it up to 12 volts
12 volts showing point five one here

00:13:05,689 –> 00:13:11,790
0.49 seven here we’ll check the accuracy
which I can make sure that’s within spec

00:13:11,790 –> 00:13:21,290
I want to do the math in my head and
let’s just take her right on up

00:13:28,569 –> 00:13:35,360
24 volts 1 amp 0.99 for amps so all in
all through the whole range it looks

00:13:35,360 –> 00:13:41,569
fairly accurate look pretty darn
accurate here so I’m gonna say that’s

00:13:41,569 –> 00:13:53,959
the wind there so all in all not a bad
little product especially for the price

00:13:53,959 –> 00:13:57,649
point I’ll stick a link down and
doobly-doo so you can check it out on

00:13:57,649 –> 00:14:03,920
Amazon yourself but I definitely would
recommend this for like hobbyist or

00:14:03,920 –> 00:14:08,540
guys like me just home gamers just you
know playing around with some

00:14:08,540 –> 00:14:13,189
electronics if you need just a good
decent DC power supply bench power

00:14:13,189 –> 00:14:17,360
supply just to mess around with you
don’t need anything with too terribly

00:14:17,360 –> 00:14:22,129
much precision this is definitely this
is definitely made for for people like

00:14:22,129 –> 00:14:27,319
me so if this review helps you out give
us a thumbs up don’t forget to hit the

00:14:27,319 –> 00:14:32,449
subscribe button more stuff like this
coming definitely gonna play around on

00:14:32,449 –> 00:14:35,839
the interior we’re gonna work with this
thing a little bit and and we might

00:14:35,839 –> 00:14:39,439
actually have a we might actually have a
new series coming up with with arc

00:14:39,439 –> 00:14:44,749
lighting the guys over at 23 B so stay
tuned for that if you enjoy hacking and

00:14:44,749 –> 00:14:48,829
and mess around and play around in the
workshop we’re gonna be we’re gonna be

00:14:48,829 –> 00:14:51,230
having a good time so don’t forget to
hit the subscribe button

00:14:51,230 –> 00:14:58,660
my name is Atari I will see you guys
next time and until then Tallyho y’all

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