Shock Box

this is a little toy that delivers a mild shock at the touch of a button
if used as directed this project will give a non-lethal shock that's kind of fun

this project will never need to be plugged into mains voltage
i am never responsible for anything you do

i actually stumbled across this concept via painful accident
i applied power to a transformer then when i turned the power off it shocked me
i tried it ten more times and figured out what what was happening
power was being transformed and then stored in the inductance of the transformer then being released as a shock
(somebody correct me if i'm wrong or they find something smarter)
(knowledge is power)

Step 1: Matreials and Tools

-standard screwdriver
-wire cutters
-soldiering iron

-9V battery snap
-alligator clips
-ac/dc transformer
-clickey switch
-2ft light grade wire

the transformer needs to be at least 5V and 300ma. just nothing wimpy.
a 9V battery is preferred but you shouldn't use anything stronger or you could hurt yourself.
you can use the battery clip or the alligator clips, either is fine.

Step 2: Open the Transformer

i used a grinder to go around the edge of the the transformer
the grinder will shoot hot molten plastic at you so use safety glasses
you can use a screwdriver or a knife but it will take longer
try not to completely destroy the case or the insides
cut the transformer away from the circuits and try to keep the wires long

discard the circuitry or keep it but you wont need it for this project
keep the case to put the transformer back into
pull out the ac power prongs and save them for later use

Step 3: Cutting the Transformer

find the ground wires on the secondary coil and cut the rest off

if your transformer has three wires(most do) use the first and second wire but cut the third off
(the third and first are interchangeable but only use one of them not both)

be sure you're working on the secondary coil
cut off the primary coil wires because you don't need them

the secondary(output) coil has fewer wraps thicker wire
the primary(input) coil has more wraps of thinner wire

Step 4: Wiring

cut a the following lengths of wire
double strand:
-8 in
single strand:

strip all the wires 3/4 of an inch on all ends

connect all the wires according to the diagram
you can solder the connections but it's not necessary

Step 5: Conection

connect the two leftover wires to the transformer leads
apply electrical tape to all of the stripped ends
cut a hole in the case and slip the wires and the switch through the hole

i melted the switch to the case with my soldiering iron but you can attach it however you like

Step 6: Closing and Usage

melt the back of the case to the front piece with a soldiering iron
you could just wrap the entire thing in duct tape


connect the battery to the clips
it doesn't matter if its backwards because were working with non-polar electricity
i completely made that up but it doesn't matter +/-

take the shock terminals in your pointer middle and thumb fingers
but make sure they don't short out or you wont get any shock

press the switch for half a second and when you let go it will shock your fingers

the harder you squeeze your fingers the more shock you get
you can press the switch rapidly on and off to get a rapid and slightly painful shock

you can also try a trick with your friends
make a circle of friends as many as you can get
the first friend and the last in the circle each grab one shock terminal
and you click the button
all of your friends will scream and you'll just laugh at them

lol lol lol



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    70 Discussions


    7 years ago on Step 6

    It seems apparent that you don't respond to your comments or questions, but I will pose mine instead. Why do you use the transformer at all? what is its purpose in your design? you don't use its induciton ability due to the DC input and you disregaurd the primary inputs. it seems to me that you just use it as a capicitor of a sort.

    1 reply

    Reply 3 years ago

    He uses the transformer as a step up transformer to increase the voltage. A capacitor alone will not work since it doesn't change the voltage.

    Luigi Pizzolito

    5 years ago

    I just opened a AC/DC adapter but there's a this really small transformer with 6 pins 2 on one side and 4 on the other side, which ones should I cut?


    7 years ago on Step 6

    it works! Thanks, its realyusefull instructables


    7 years ago on Step 6

    how many volt transformer we need for this project

    Adam Manick

    8 years ago on Step 2

    Why did you take apart a nice variable transformer?


    10 years ago on Introduction

    That is a great instructable! I had built is shocker as soon after I read your instructable, and went outside and started shocking all of my friends and they all had scream after they got shocked by my shocker! Lol!! What a great toy! Thank you for that great instructable!

    4 replies

    Reply 10 years ago on Introduction

    i once used 3 9V batteries. holy something. i got this kids funny bone and his arm completely started spazing. this is not really recommended. and its not really recommended to use is at school. teachers are scared of lightening or anything that hurts


    Reply 10 years ago on Introduction

    I used a 9v battery on a alarm clock transformer, it did not hurt that much, but I tried using a bigger transformer, it hurts even more! (Ouch!!) So I think the size of the transformer does matter, the bigger the transformer you use, the more painful the shock will be... And also I NEVER used the shocker at the school because I think the shocker is considered as a weapon, (like a stun gun) so I don't take it to the school because I don't want to get in trouble.


    Reply 8 years ago on Introduction

    hey plamana, besides the ones you posted up, do you know any other ways to make a shocker? like... on a solderless breadboard? so its a little easier for people who cant really solder as good as you. people like me


    10 years ago on Introduction

    Power is also power, too, you know. use a car battery if you're suicidal... or murderous and make a tazer with the thing...

    2 replies

    Reply 9 years ago on Introduction

    i tried something about half the current of a car battery, And the coil overheated and shorted itself...


    Reply 9 years ago on Introduction

    at room temperature car batteries can put out nearly 1000Amps. half of that is 500ish. that should make your coil explode.

    try to keep the current under 500mA
    most AC adaptors only draw about 300 - 1000mA

    a shorted 9v will put out 1-3Amps