Making 5 Things from a Broken Hair Dryer

Making 5 Things from a Broken Hair Dryer
Hi today we want to get into the amazing
world of a hairdryer
and you can harvest a few components
from the hairdryer like the heating
element which is a bunch of resistive
wires
this one i’ve used before in my seat
warmer video also a bunch of switches a
dc motor a full bridge rectifier a power
cord a
fuse and a thermal breaker let’s heat it
up
oh it popped open
so it opens the circuit
when the
temperature rises above some threshold
it’s pretty much like a fixed thermostat
and we can do a world of projects with
these and learn which is
mostly for me to do and for you to only
watch
if you kids want to do educational
projects you can actually do then head
on to my sponsor kirikou they provide a
ton of different fun project crates in
steam for different age groups and using
my link kiwico.com electroboom you can
get 50 off your first month of any crate
but my projects are educational projects
done by a certified professional
failure-prone dumbass excuse for a human
being such as myself so let’s make
things you can unwind the heater element
and use it for multiple different
purposes first let’s make a foam cutter
out of it you cut like 20 centimeter of
wire and straighten it then you need one
of these plastic clamps you can find in
your dad’s toolbox for some reason these
have holes at the end of the handle you
pass the wire through it and twist it
then open the clamp a little bit pass
the wire through the hole and twist it
again
now
if you let go of the clamp
its spring will keep the wire stretched
now we can just tie the power cord
across the element and plug it in
it blew like a fuse
you can make a fuse out of these wires
okay let’s not lose focus first i’ll
make a foam cutter then i’ll make a fuse
this wire is around 250 milli ohms per
inch so over four inches and 120 volts
it would draw 120 amps i just need it to
be warm enough to cut a foam i just
connect it to a 10 volt supply and raise
the voltage if needed
i just connect this to a zero volt
supply and raise the voltage as needed
one volt
a bit sticky tools start to smoke
oh it is cutting
a little bit
more maybe
three volts
nice
so two double a batteries i just needed
two double a batteries just make sure
you use rechargeable batteries because
running three to four amps through them
will discharge them in more than half an
hour not too bad then you’ll need to
recharge them well i don’t have a proper
battery holder but i have some
neo-medium neodymium magnets
that can hold my batteries and wires
together
there
ready to go
will it cut
let me see if i can cut a duck out of it
my hands are too wobbly for a beautiful
artwork let’s retry
okay a little bit better
this cuts well and it’s safe too
something you can do at home
okay let’s make a fuse a fuse is
basically a piece of wire that gets hot
and melts open when too much current
runs through it let’s see at what
current it melts
five amps maybe
yeah no it glows a bit but no burn
seven amps perhaps
still no and i don’t think real fuses
glow like that how about 10 amps the cab
now
i guess it could be a 10 amp fuse
i keep engraving myself with hot wires
i guess we could make an engraver out of
it okay okay so we need to hold the wire
somehow with some
fire resistance material
a piece of stick maybe i tie some copper
wire to the end of this wire like this
tape it to the end of the stick
and we have our engraver now we just
connect it up and engrave
quick i need a piece of wood
oh
wood is not fire resistant i’m thinking
we could use
some terminal blocks to hold the wires
the good thing about terminal blocks is
that they have this big chunk of metal
in them so it acts like a big thermal
mass and it will get warmer much slower
than the wire itself we could take it
out of the plastic too if it melts later
hide the element and wires the terminal
block
now we can tape it to the stick because
the copper wires won’t get warm anymore
and now we have a safer engraver and now
we can engrave let’s start from six amps
[Music]
it engraves nicely what
maybe six amp is a little bit too much
how about five amps yeah five amp is
nice too but the tip of this thing is a
little bit too wide we should make it
sharper
there you go much sharper
turn it on
[Music]
beautiful in it
too much smoke though i know we can use
the fan we harvested from the hair dryer
to suck
remove the smoke
i just forgot to figure out how it was
connected before i cut everything off
there you go this guy has the schematic
so the 120 volt line goes through the
full bridge rectifier first before
feeding the motor because it’s a dc
motor fortunately for us the rectifier
is already connected to the motor we
just tied the power wires to it
and now it’s ready
my diodes
let me just directly connect it to my dc
power supply and check something
nine volts
and all it needs is like 15 volts
if you don’t know how something works
don’t put false information on the web
if i’m not wrong the dc motor was driven
through one of the heating elements so a
big portion of the voltage would drop
over the element and a small portion of
it was driving the motor
which makes me think we can make some
good power resistors from these
for now we just tape the fan into some
pipe that we can vent it out of
somewhere it doesn’t quite fit but
doesn’t matter see due to some fluid
dynamic effect the smoke isn’t just
sucked into the fan
it is also sucked from the sides of it
into the pipe
so now we can engrave in peace except
that we need two power supplies or a
single supply with two outputs the good
thing about having supplies is that you
can tune the airflow or the temperature
of the engraver
let’s make a resistor why should you pay
a ton of money to buy a power resistor
when you can run 5 amp through this wire
no problem you can cut a 1 ohm length of
it for 25 watts or 10 ohms for 250 watts
here’s a 10 ohm 250 watt resistor that
can take 5 amps like a champ see
well evidently there are two different
types of wires in this heating element
one is much thinner than the other one
and melts at much lower current
we could make two different fuses out of
them oh well i’m left with around 15
ohms of the thicker wire now i just need
something to wrap it around
not again
why don’t we just wrap it around its own
heat resistance core
here you go an almost 15 ohms 300 watts
resistor let’s connect it in series with
another hair dryer don’t try this at
home here you go let’s switch it on
oh
it’s heating up already i guess i can
cool it down with
the hair dryer
how much current is it drawing
oh
stop it see if i connect a line directly
to the hair dryer
it runs fast but through the resistor
it runs much slower because the resistor
limits the current and i bet if i
connect it halfway
it runs faster too
which brings us back to our
potentiometer or variable resistor i’m
going to use my trusty spoon as the
potentiometer slider and tune the speed
of my hair dryer
how much current is it drying the whole
thing is
fused
it must be over 10 amps
i bet if we blew air over our resistor
to cool it down we could even run it at
higher currents
i guess we already have our high power
resistor with the fan set up here let’s
check its resistance
what
two mega ohms
well it’s on but on the lowest setting
it must be going through the elements
that goes through the diode and motor
and doesn’t show right next setting
20 ohms
next one 10 ohms on 120 volts is like
1440 watts that’s a ton man just use a
hair dryer as your power resistor it has
multiple resistor settings a cooling fan
and all the safety features already set
up while you can use it to dry your hair
if there was any or instead if you want
to learn by making projects then go to
my sponsor kirikou great project
assortment with nine different lines
covering all ages for kids from zero to
100 years old these are hands-on steam
projects designed by experts and tested
by kids who can enjoy building them with
the great instructions provided and the
additional knowledge and science behind
it this looks a bit too technical you
think you can make it
of course i can build anything
that’s my daughter
visit kiwico.com electroboom to get your
first crate any crate at 50 percent off
my daughter has been building a few
crates now and not only she gets
hands-on building experience and learns
a ton but also the end products have
been quite fun and useful too
does it work it works like a charm let
me give you a stronger light
look at it it’s a light seeking turtle
it’s a moth turtle
high five
so do your kids a favor sign up using my
link and fill up their summer with
awesome kiwi co-projects they can learn
a ton from while having fun gaining the
creative confidence they need
and thank you for watching

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