Hi, Zerosvarka,
I have to agree with Acetronics, an automotive coil uses about 6 - 7 amps RMS, so in reality it is using probably 6 times that in very short bursts, making everything Acetronics said make sense. Big also, what do you expect to keep cool with a little Chicken S_ _ T heatsink like that, maybe a 7805 regulator, but never your switching transistor. Really good connections will lose some voltage at those currents and the really bad connection associated with breadboards will cause heating and big time voltage loss. Cars require ROBUST parts, and then even then they fail. Good luck, and keep us posted, I would like to see the results when you have it working.
JS
If you do not believe in MAGIC, Consider how currency has value simply by printing it, and is then traded for real assets.
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Gold is the money of kings, silver is the money of gentlemen, barter is the money of peasants - but debt is the money of slaves
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There simply is no "Happy Spam" If you do it you will disappear from this forum.
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