# High voltage ignition coil supply

In this Instructable I will teach you how to build a High voltage power supply using an Ignition Coil.This project uses a 555 timer based circuit.We use a 555 IC because an ignition coil needs a squire wave signal to power it. so basically the 555 timer is making pulsed DC electricity which powers the ignition coil.

## Step 1: Danger High Voltage!!!

This project shows how to make a High voltage power supply which produces about 30 or more MA, which is enough to Kill you! so Don't try this if you are not experienced with high voltage!
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pejipejman6 months ago

why dont you use a trap for the frequncy by measuring the frequncy ?
you can put it right behind the transistor and the negative line.it should isolate the negative line with the spark.
i draw it in the schematick below.

rdstarkrishna8 months ago

Thank You in advance , i built one circuit which provide frequency puls of 100-400hz but ignition coil is producing only 1.4kv maximum when i viewed through CRO please help me. WIth same pulse with EHT i am able to produce 10kv y in ignition coil its droping.

short stack10 months ago

is it possible for me to use a car battery and instead of the 1uf 12v cap using a 1uf 16v

8 months ago

there's nothing wrong with using a capacitor with a HIGHER voltage rating... However, using a lower rating can be tricky. In this case, I would say yes, 12v is fine. And the Instructable asks for a 12v, 6a power supply, so a car battery is more than enough. It will work fine.

codeym10 months ago

I made something similar, but I use 110 volts. I use a dimmer switch in series with a 175 volt 11 microfarad motor capacitor and connect that to an ignition coil. I get thick arcs about 4 inches long. It sounds like a taser on steroids.

MandeepC11 months ago

i required +/-15 v to drive IGBT. I have made one circuit in which i required +15 volt when input is high(+5v) and -15 volt when input is low(0). this input is not continuous it is only the pulse input.i have made circuit as per below, but it doesn't provide +/-15 volts. so help me

MandeepC11 months ago

i required +/-15 v to drive IGBT. I have made one circuit in which i required +15 volt when input is high(+5v) and -15 volt when input is low(0). this input is not continuous it is only the pulse input.i have made circuit as per below, but it doesn't provide +/-15 volts. so help me

MandeepC11 months ago

i required +/-15 v to drive IGBT. I have made one circuit in which i required +15 volt when input is high(+5v) and -15 volt when input is low(0). this input is not continuous it is only the pulse input.i have made circuit as per below, but it doesn't provide +/-15 volts. so help me

i've got plans to build one of these eventually. Glad to see you're getting good sparks from yours. The reason 555s are dying in the back EMF from the coil. When the transistor turns off there's a WHOMPING great spike shoved up the power rails. This takes out the 555. Put a power diode across the coil with the cathode (pointy end, with the band) to the 12V rail. Also a 1000 microfarad 25V or so capacitor across the rails would help smooth out the load on the power supply and could give you better sparks.
1 year ago

Is this what you mean about the diode? i keep smoking the timer. thanks!

ARJOON4 years ago
i used an irfp250 instead for the 2n3055. i got far much bigger spark and also when i used 32v of input to the mosfet the ignition coil was sparking to the concrete. the was super crazy. like a tesla coil. haahahahaha
1 year ago

When you used the irfp250 did you connect it the same has the 2n3055 like this? or did you change anything? thanks!

1 year ago
yes like this but substitute the 100R resistor to 150R else the gate will be too saturated
3 years ago
I agree on your choice for using IRFP250n as not only a mosfet has a better rise/fall time in other words is more capable for fast switching, but it also incorporates a flyback diode for protecting the drive transistor from back EMF blowing all the circuit to nothing. A steering diode at the supply input would also be a wise idea to protect the circuit and improve commutation.
4 years ago
can i use a IRF510 Transistor
3 years ago
it think it should work
4 years ago
becuase it basically is a mini low voltage tesla coil If you think about how it wroks they are both very similar.
josh13243 years ago
I noticed the coils negative terminal is connected to positive, and vice versa, is it supposed to be like this?
2 years ago
That portion is backwards, everything except the + and - on the Ignition coil is correct, just flip the two
techno guy3 years ago
This doesn't work, I already fried 3 555 timers because of how the negative is connected to the chip and the high voltage goes into the chip and fries it.
2 years ago
I have the same problem, can anyone reply to this post with a good answer because its either the 555 chip for me, or the power plug, both of which fry when I change the POTs
wolf9963 years ago
I've Been Super Shocked And I Was Like Pikachu For A Few Days I Touched My Friend In The Neck And Burt Him Thank You For Electifiying Me
3 years ago
were u be able do attacks like stainless steel tail or concentrated hit ??
2 years ago
Yes And People Kept Throwing Pokeballs At Me
Techno Dude3 years ago
Just yesterday I got an 2n3055 transistor but then also the ignition coil dint work can some one pleas help me?
3 years ago
try flipping the polarity on the auto coil (its wrong in the schematic)
Techno Dude3 years ago
I am trying ti build a tesla coil ,but today when I tried your driver circuit but instad of 2n3055 tranisistor i used an irfp250 transistor it dint work. what do u think I
have to do
safetec4 years ago
I have a question: Can the 2n3055 power transistor be replaced with any other transistor? and also can this circuit be run using for example a standard 9V battery to produce a little less current? Is there anyone out there that can perhaps propose a circuit using a cellphone charger's transformer to boost the V output?
4 years ago
The power transistor is probably there due to the inductive kick when the magnetic field in the ignition coil collapses. Or it could be the frequency it's switching. I've had problems with a 555 switching a camera flash transformer with a generic 2n2222 NPN signal transistor. The tiny little plastic case can't dissipate heat (well, not much anyway) and ended up melting on me.
takide4 years ago
do you know what the operating frequency of the ignition coil is?
highvoltageguy4 years ago
u get ignition coils the same way as i do i have two
ge6aaaa34 years ago
How can i make bigger spark?
hinmung4 years ago
can replace the car ignition coil with motorcycle ignition coil ??? and any bad things happen such as the 555 timer explosions.
4 years ago
a motorcycle needs roughly the same voltage too and no changing the coil is not going to blow the 555
mbainrot4 years ago
You do know that the image on step 1 is in breach of copyright?

http://www.powerlabs.org/highvoltage.htm is the owner of the image, you've just cropped it so the "(C) http://www.powerlabs.org"

Do you have permission to use that graphic?
ARJOON4 years ago
what can i do if i want 400v from it
4 years ago
you cant get 400v from it, its a high voltage transformer
gafar musa4 years ago
wow,this is interesting but am thinking of 1 how to measure d output, 2 how to use this circuit to power electronics or two or more bulbs. is d output voltage AC or DC?.
Any one with idea should help me send d contribusion to gaftech03@yahoo.com
carebare475 years ago
When I run this the transistor gets hot very quickly, and the spark generated is minuscule and only happens every second or so. Any ideas?
4 years ago
on car ignition coils there is always a special capacitor called a condenser and if u add this to ur circuit and put a heat sink on the transistor then you will have a good high voltage power supply
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