Instructables

Super Simple ignition coil drivers

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
 
 
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Can I use an IGBT instead of the 2n3055 transisitor. and will it improve the performance. also will the hv kickback kill it
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.
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)