Instructables
danger-high-voltage-safety-sign.jpg
ignition coil circuit.gif

 
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Step 2: How my schematic works.

this is how my schematic works.hers is a schematic that shows what the capacitor does. this the first schematic. it is a good driver for making big, hot sparks (NOT arks).

Step 3: My schematic (cheap and easy)

this is my schematic its easy, but it, with my power source, only makes about 20 KV (1 inch ark) at a low fixed freq. it's also noisy but still very cool. this makes VERY VERY small streamers due to its frequency. and makes cool plasma globes out of light bulbs.

                   simple____ || ________________hard

                    $0.01__ || ___________________$50+

harmless shock ___ || __________________electrocution
 

Step 4: A super simple driver

this ridiculously simple driver with no doubt simple,and exceptionally cheap and can easily produce 40KV! there are a few disadvantages with it, its mains powered, making it dangerous, and the frequency is not adjustable.

                   simple_ || ___________________hard

                    $0.01_______ || ______________$50+

harmless shock _________________ || ____electrocution




(due to my laziness and super slow Internet, instead of pictures, here's another instructable showing how to build it. it will have the pictures and schematic in it)

Step 5: 555 timer driver

Picture of 555 timer driver
another coil driver is the popular, 555 timer driver.

it oscillates a transistor that drives the coil. its a little more costly and complicated but its overall simple.

you can tune the output by the POTs. i haven't made the driver yet


                    simple____ || ________________hard

                    $0.01_____ || ________________$50+

harmless shock ____ || _________________electrocution
 

Step 6: Another 555 timer driver

another 555 timer driver. there are a few more components added and changed.
to me this is the most complicated circuitry i found.

                  simple_________________ | | ___hard

                    $0.01_____ || ________________$50+

harmless shock _______ || ______________electrocution
 
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Dillon123 10 months ago
relay circuit really works on msd blaster 2 coils
-max- (author)  Dillon123 10 months ago
Great! Add some images, I'd love to see 'em!
Dillon123  -max-3 months ago

here is my circuit

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deej3971 year ago
Hey what type of power would you use for your step 5 schematic? Right now I'm trying to use a 12v lantern battery I got from radio shack but its not working. Also I'm on a breadboard just for testing purposes. I thought this could be done with 9v batteries so you'd think a 12v lantern battery would work but I'm having no such luck. Thank you

it is a 6v lantern battery not a 12v

-max- (author)  deej3971 year ago
I used both a 12V drill battery, 18 volt drill battery, a 12V PSU,

I have never heard of a 12V lantern battery, they are 6V. does it have any juice left? I had success with as little as 9V if I remember. (not the 9V battery, but a power supply.)

does the relay do anything? if it is buzzing, then change out your capacitor for a different one. small ceramic ones will not work.
deej397 -max-1 year ago
Well I'm using the ignition system on Step 5, I got it to work with a 12vdc wall outlet, but now I think maybe one of the components is fried, because it suddenly stopped working. I'm wondering what that component could be? I'm using a small .1uf ceramic capacitor and the 2N3055 Power Transistor. I don't think my 555 chip's fried because I switched it out and the same problem occurred. I tested the project on a breadboard and it worked, but it stopped working on the breadboard. I knew the project worked before so I soldered it up thinking it could be the breadboard making the connections not work 100%. Still doesn't work. Thanks for your reply!
-max- (author)  deej3971 year ago
I bet it is your 2N3055 transistor. not only is it hard to find a good one nowadays, but they also tend to burn up with inductive loads. The back EMF spikes fry them easy. You need a transistor that can handle lots of EMF (at least 10 times the voltage of the power supply), and thermal runaway.
deej397 -max-1 year ago
Thanks again for your reply, i did more testing in class today and figured out both my wall transformer (just a regular 12vdc plug with a transformer box as a plug) is fried, also the 555 chip. So i replaced the chip and replaced the plug with a digital power supply. I figured out when I adjust the 10k POTs, sometimes the volds would spike from 12 to 21 or 18, and the average current was 3 or 4 but that would sometimes go to 0 ( that might be because of the 555 chip was fried) So now my major consern is what is the proper power supply that is not a battery and wont fry? And kinda on the cheap but not cheap quality. Thanks for your time!
-max- (author)  deej3971 year ago
the best power supply to use would be one of the big clunky power supply’s that inside have a giant transformer, 4 diodes, and giant electrolytic capacitors.
deej397 -max-1 year ago
Thanks again for your reply, i did more testing in class today and figured out both my wall transformer (just a regular 12vdc plug with a transformer box as a plug) is fried, also the 555 chip. So i replaced the chip and replaced the plug with a digital power supply. I figured out when I adjust the 10k POTs, sometimes the volds would spike from 12 to 21 or 18, and the average current was 3 or 4 but that would sometimes go to 0 ( that might be because of the 555 chip was fried) So now my major consern is what is the proper power supply that is not a battery and wont fry? And kinda on the cheap but not cheap quality. Thanks for your time!
Can I use an IGBT instead of the 2n3055 transisitor. and will it improve the performance. also will the hv kickback kill it
HeatUp1 year ago
can you help a little bit abou the pic you uploaded at Aug 26, 2010. 6:06 AM.is that thing going from positive and negative terminals form relay is mthat capicator?
-max- (author)  HeatUp1 year ago
I don’t understand what you mean. are you referring to the schematic picture?

from the battery, the power enters the relay coil. here, the relay coil, capacitor and the normally open pins are in parallel. after the coil is magnetic flux built up, the the armature will short out the capacitor and let power to the coil.

the current then creates a magnetic flux inside the coil, where the outputs collects that energy and gives an output. then all the current travels back to ground (other battery terminal, usually negative side, but the polarity of the battery does not matter)
TeslaBoy2 years ago
It works but not as well as the relay driver since resonance can't occur in the primary circuit with out blowing the transistor up. To get a good spark you need primary resonance. Just like a good Tesla coil.
-max- (author)  TeslaBoy2 years ago
i didn't know that.

clearly the transistor in this circuit needs a snubber on here, maybe a .5uf capacitor across the primary and a diode in between one leg of the ignition coil, and the collector (or drain) and another HV zener diodes in series, one to prevent backwards flow into the transistor, and let the current go to ground.
TeslaBoy -max-2 years ago
That would work but would eliminate the resonance. In these digital circuits you just can't have any voltage or resonance in the primary. But at least that would allow you to keep this running.
-max- (author)  TeslaBoy2 years ago
the resonance will occur with the capacitor/primary tank circuit, and all the diodes will tame the current if it gets out of hand.

that what i think,anyway.
R.A.T.M2 years ago
couldnt you use this for a fly back
-max- (author)  R.A.T.M2 years ago
which circuit, some of them (like a modified version of the 555 driver) would drive flybacks, but some (like the relay-based ones) wont drive a flyback. flybacks require much higher switching speeds.
R.A.T.M -max-2 years ago
okay thanks man
I can't quite tell which direction the power flows, and where the battery would connect.....
-max- (author)  freenergyfuture2 years ago
looking at this schematic i see the coil connected backwards...

answering your question (i hope i understand what you mean) power (electrons) go from the negitive to positive. when building the circuit, one way perseve this on a breadboard is to split the schematic into 3 parts;

the timer circuit (555, resistors, capacitors, etc it flips on and off a current going to the base of the transistor), so build this and test it with a speaker or oscilloscope. 

the amp (the transistor that picks up the small signals from the timer and out comes large signals to the coil, [flipping on and off the power to the coil many times a second])

the coil ( that turning that pulsed DC into a high voltage)

oh, and the ground (3 or 4 lines at the bottom edge) is the - side on a battery and the +12V 6A is the + side of a battery.

so when building, make the first part, then second, then third. as you make it have parts go to the plus side and ground, (minus side)
bswt3 years ago
relay did not last that long
-max- (author)  bswt3 years ago
if you can pop it open, sand the crap off the contacts, and test. if it still doesn't work, your coil burnt up and you need a higher power relay.
Did you actually test the shock I've shocked myself with HV a lot more than I should have but I would never do it intentionally? Camera flash systems really hurt as well as HV capacitor discharge. My worst with ignition coils was a direct strike from this ignition coil driver.
-max- (author)  The MadScientist3 years ago
it doesn't look like it would hurt nearly as much as this page... the circuitry looks similar to page 5... just with a voltage regulator and a high voltage muffler.
anyways, no. i never even built this circuit, though others that did say it really hurt. and examining the circuitry, i don't blame them. also, just look at the second picture, to me that is a death spark!
Actually, that is not a high voltage muffler so much as it is a gate drive shaping circuit. It limits the current between the 555 and mosfet during turn-on which momentarily takes it into it's linear region. Then, it gives it a hard, quick turnoff, but still protects the 555 from mosfet failure by current limiting.
That does look pretty high Amp the flash circuit hurts enough.
Kirbsome!4 years ago
I've been looking for something like this, can the first driver use a 9v battery?
-max- (author)  Kirbsome!3 years ago
i tryed with a more powerful 9V driver recently (wall-wart) and it work! but with less epic sparks :( i found the 24V works the best but the relay will need to be modified with a bigger spring in it so it doesn't lock up.
-max- (author)  Kirbsome!4 years ago
i don't know for sure. i tried with my model, and it produced tearable results (400 volts the first second or so, then died out. but again the battery was probably half dead.

also,the circuit actes like a VCO (voltage controlled oscillator) more voltage, lower freq.
Kirbsome! -max-4 years ago
So, I need low voltage high amps?
Gujkil3 years ago
what parts i need for the driver?
-max- (author)  Gujkil3 years ago
depends which circuit your talking about.
migsters3 years ago
Will a OMRON SPST 10 AMP Relay work? If so, how would i go about hooking it up?
-max- (author)  migsters3 years ago
Never heard of it. I'm predy sure any relay shoud work but I don't gurentee. As long as its capale of working on the power that comes out power-source. And has the same contacts as the schematics have.
one88773 years ago
how the diagram if I use a motorcycle coil
-max- (author)  one88773 years ago
the same diagram should work for any coil.
are you saying you can make an oscillater with a relay?
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