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.
PS305 on Amazon: http://amzn.to/2CcmKUF
PS305H (4-digit display): http://amzn.to/2H9pgyK
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TRANSCRIPT:
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Pevono PS305 DC power supply is it
worth it
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let’s find out greetings programs Atari
here you there and this is a Pavano PS
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305 DC bench power supply now the folks
over Pavano they asked me would I be
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willing to do a review of their product
so they sent me one of these is a
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demonstration unit that they sent me so
you know so far out of the box it looks
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pretty decent a pretty decent build
quality it’s got these nice 7-segment
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display on the front and of course
they’re either LED lit so it’s got a
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nice look to it got your your voltage
and current adjustment to your course
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and it looks fine on this side and then
we’ve got your positive negative and a
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chassis crowd so let’s take her apart
and then let’s do it as a bench test and
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let’s see what we get so first things
first you have our ceremonial unboxing
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here the first thing we see is a pair of
leads here the banana clips and
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alligator clips we’ve got our our core
instruction manual but who’s really
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gonna read that and then of course the
main event here is my main unit packed
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very nicely and some styrene
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it’s best ik
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right there okay so we have our unit
here we have they’re nice and sturdy
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aluminum construction just go ahead and
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so start here back we’ve got our power
supply input and it is fused there is a
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fuse inside there a nice little switch
between 110 220 uses this
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internationally big beefy fan here on
the back our heatsink you know come in
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from the power supply back here now the
first thing I notice is that these these
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terminals are not insulated that to me
poses a problem just a safety issue I
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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
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a hard switch directly over here to the
toggle switch on the front again not not
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insulated you can see how closely
together those those two toggles comes
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just any little bit of horse on there
that later on there and those two are
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going to bridge and we’re gonna have
four well I think what I’m going to do
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is put a little heat shrink on there and
just insulate these a little bit better
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and maybe I’ll do that in a future video
anyway so we’re coming back here here is
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the AC side verbal rectified beeping
capacitors up here too
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I’m all set transistors trigger on these
nice big heat sinks here so good
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looks like we have good heat dissipation
we got it’s actually a very clean board
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very nice it doesn’t look like it’s just
slapped – put together here we have the
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flat board you can see there we’ve got
our the driver for our LED displays a
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couple of pop trimmers for the accuracy
there on the display let’s see there’s
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our terminals there some good that
everything looks pretty good there it
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looks like this is some sort of noise
reduction got a couple of noise
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filtering capacitors here looks like
there’s actually a couple of spots for a
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couple more passengers but we’ll see
we’ll see what the noise is on these and
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maybe we’ll maybe we’ll play with that
another day having a look at the back of
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the board here and you can see where
this is the AC section and of course the
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rest of the DC section personally I
would like to see a little better
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separation here that’s I mean there’s a
good bit of you know there’s a good you
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know almost a fingers worth of
separation between the AC and DC sides
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but me just being the perfectionist I am
I would rather see some physical
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separation maybe a cut out just just to
give you a nice air gap little bit more
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safety over there separation there but
but this is not bad this is actually
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rather rather good build quality I’m
highly impressed with the quality of
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this build and so so far so good
looks like we’re gonna have a pretty
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decent little product here now she looks
pretty good on the inside
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couple of little things here and there
not anything that’s a deal-breaker and
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nothing I can’t fix myself which I’ll
probably do another video so go ahead
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and hit the subscribe button so you’ll
be notified when that comes out so now I
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guess what we really need to do is test
her
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against the specifications but I don’t
really have a proper bench testing setup
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right here but I do know a guy so we’re
gonna pack this stuff up we’re gonna run
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down the street and we’re gonna give her
a proper rundown
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okay so I’m here with our clients 23b
hackerspace here in Fullerton California
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I asked him if I could use the the
workbench here to to do a little more
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accurate measurements of this thing
little literal bench test if you will so
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Arclight show me what you got here yeah
so this is our double Yi electronics
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bench here we have a bench top DMM here
that goes to four digits it’s called the
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math tech 80 40 we have a rival ds-11 Oh
200 megahertz scope will give you sample
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should be pretty adequate for testing
you know power supplies things like that
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and of course we have absolutely an we
have already standard tests so we’re
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gonna measure some current we want to
see what kind of rip will get me any of
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that stuff voltage accuracy no problem
fantastic all right let’s get down to
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business
let’s do it the frequency to which you
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are to the present time is the one on
which you will normally receive civil
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defense information in the event of an
actual emergency okay so our Clyde has
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very graciously allowed me to use the
electronic shop here at 23 beta to check
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this thing out on the oscilloscope so
let’s hook it up and then and find out
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what’s going on here we’re going to look
up our leads here course light black and
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red
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okay we got our scope all set up and
we’ve got the power supply here it’s
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it’s pretty sad already to do 12 volts
so let’s see what it’s got see here a
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bit of a ripple going on with the
switching power supply a little bit of
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noise on the line there okay so now
let’s try this under load I’ve got it
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hooked up with a 10 watt 10 watt
resistor here 24 ohm let’s see see what
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we do with the 12 volts here we’re
running about 12 volts a half an amp
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here and it’s still got quite a bit of
noise in there even under load one other
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thing we really need to look at is the
voltage spike when it comes on it seems
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to be kind of seems to be a bit of a
spike when you turn it first on and that
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can be a problem with sensitive
electronics things like that so let’s
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take a look here and and see if there’s
any bad spike when it happens okay there
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we’ve got a nice little spike 20 volt
spike right there or it love this back
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off so this could be a problem if you
have sensitive electronics or anything
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like that so just something to be wary
of so don’t have your load connected
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before you turn it on turn it on and
then connect your load well here at the
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shop I might as well check the accuracy
with a much more accurate multimeter
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than what I’ve got at home this is a
mass Tek ms 84 T true RMS multimeter
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so it’s accurate to like 4 decimal
places something like that so we’re
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gonna check it out with this and so
let’s just go ahead and turn her on back
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down to stick it down to start it out
about 12 volts okay so we got 12 volts
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there and we’ll just check
voltage here still quite 0 and 0.0 0.0 4
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9 so fairly accurate – terribly bad ok
let’s take her up to the top end here
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toast about 24 volts that’s fairly
common 24 volts a 4.04 volts excellent
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so still fairly accurate here take her
all the way up to the top to the tippy
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tippy top fans kicking in a little bit
31.9 volts on the screen there 3196 so
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even still accurate up at the top
extreme now let’s take her down to the
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you’re gonna have the low end
let’s do about 3.3 volts actually let’s
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get 5 volts and make sure our five bolts
good working on electronics I’m usually
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working with 5 and 3.3 volt
you know logic and so forth so five zero
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two nine five zero three right there on
a 5.0 display let’s take it down to
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three point three three point three
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one three one seven on the RMS and then
she’s taking it all the way down to zero
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because the cool thing about this is
that actually does it will read zero or
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three and rolling down yeah it’s it’s
right at you know right around zero so a
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little linear is this there we go yeah
so we’re right down at zero now so
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fairly accurate across the entire
spectrum which is something you
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generally don’t see out of these cheapo
Chinese power supplies now I got my ten
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watt resistor here let’s let’s put her
under load and let’s see how accurate we
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are when we’re under load okay so now
we’re set up so that we can check the
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amperage accuracy so I got the whole
thing we got it running out of red and
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into a 10 watt resistor over here into
the multimeter and then back out and
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back into a negative side so that’s
let’s just take a look here we’ll start
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running it up over voltage a little bit
okay so let’s go to 3.3 volts 3.3 volts
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and showing one point four amps right
here and one point three point one three
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nine there okay I’ll take it up to five
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point two 1.20 eighths is still really
super close
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fans kicking in take it up to 12 volts
12 volts showing point five one here
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0.49 seven here we’ll check the accuracy
which I can make sure that’s within spec
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I want to do the math in my head and
let’s just take her right on up
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24 volts 1 amp 0.99 for amps so all in
all through the whole range it looks
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fairly accurate look pretty darn
accurate here so I’m gonna say that’s
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the wind there so all in all not a bad
little product especially for the price
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point I’ll stick a link down and
doobly-doo so you can check it out on
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Amazon yourself but I definitely would
recommend this for like hobbyist or
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guys like me just home gamers just you
know playing around with some
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electronics if you need just a good
decent DC power supply bench power
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supply just to mess around with you
don’t need anything with too terribly
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much precision this is definitely this
is definitely made for for people like
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me so if this review helps you out give
us a thumbs up don’t forget to hit the
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subscribe button more stuff like this
coming definitely gonna play around on
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the interior we’re gonna work with this
thing a little bit and and we might
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actually have a we might actually have a
new series coming up with with arc
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lighting the guys over at 23 B so stay
tuned for that if you enjoy hacking and
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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
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having a good time so don’t forget to
hit the subscribe button
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my name is Atari I will see you guys
next time and until then Tallyho y’all
