Ignition Coil

Yes, I just posted something on a flyback. I was interested in that, until I saw this. It got me interested in ignition coils, so I got one new from the autoparts store for $20 (USD). I looked on the site, for the schematic, and realized that I didn't know what the rectangle was. Is it a resistor? I'm new to electronics, what size resistor do I need (if it even is a resistor)?
What about the capacitor? I have a 100uf 200v electrolytic one, will that work?
Also, part of the core is not in the coil, it's square shaped, could I rig it to work like this flyback circuit?Or this one? (simple driver circuit)?

Sorry about the never ending beginner electronics questions, I just really don't have anyone else to ask.

Picture of Ignition Coil
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I think auto systems RING to reduce induced current an radiation currents

tesla coil9 years ago
Yes that rectangle shaped thing is a resistor and you will have to find the size that stops any residual charge from flowing out it is there to protect you so it is not exactly nessecary to have it in the circuit but just to be safe I would keep it in the circuit.
Goodhart10 years ago
Caution, ranges from 15000 to 20000 volts to 120000 volts or more can be gotten and the last thing you need to feel is the "hammer" of 120,000 volts entering your body at some point or another (if you have felt this already, you know what I mean by "the hammer").
It did occur to me that you really should have a good grounding(pun) in electronic basics before building HV circuits. I've had more than my fair share of being an external component in a circuit. Although electric shocks do aid concentration, I don't often recommend them for their therapeutic properties. Pat. Pending
> ... external component in a circuit ... aid concentration ... therapeutic properties ... . ROFLMAO! I _love_ the way you write!
I have become (all TOO often) the "most conductive route to ground" myself a number of times, with both DC and AC, but thankfully never "hand to hand" (through the heart) nor above the bare minimum of amperage. Ever grab a faulty coil wire while someone was cranking over the engine? THAT is where I got "hammered". About 5-6 poundings (sparks, shocks) from hand to elbow (resting on the frame) and you think someone actually broke your arm. Landing after being thrown backwards is no picnic either, but I don't remember that so well. BTW: anyone that is not careful with an automobile battery can get "burnt" (because of the amperage). A friend of mine was taking the positive terminal off the battery of his car, when the wrench slipped and he came down hard, gripping the wrench in his left hand, his wedding ring completed the short between wrench and negative terminal. He had never had occasion to remove his wedding ring THAT FAST before. It nearly melted through it and it got (a-hem) really hot.
Strangely I have found medicinist and octors to be liars, I took a hit of mains electricity across the arms, and yes for about half an hour my heart was pounding like a drum but I was fine, well apart from twitching a bit. i was changing an outside lightbulb and my brother turned the switch on, the bulb was broken so I had to touch contacts to get the bulb out, unfortunately I was wearing thick boots and holding the outer metal surround of the light housing (very good grounding point because it's stuck in the ground. I took one hit of coil across the my hand once, hammer is right but I just lost the ability to use my hand at all for a few days no flying away. What I fail to understand is how the coil manages to have a good bit of current despite high voltages or is it simply because it has been stored then fired.
What can occur is a momentary "short" amplifies current to the nth degree. Everything has it's conditions, and position is another factor. The reason I was "thrown" backwards? While the DC line made my hand grasp the coil wire tighter, the kneeling position I was in, created a tension point in my legs, and they involuntarily flexed (straightened) and that reaction catapulted me backwards.
Ah right I was leaning down with my back bent (I used to be a good bit shorter) needless to say I got out of there pretty sharpish... just not with flight...
Yeah, I became a human "jack-in-the-box" as it were. :-) One other time, when I leaned against a pair of 220 AC lines, I was thrown a bit, but the arm received the worst of the incident.
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