12V DC voltage stabilizer

I'm looking for a circuit diagram for 12V DC voltage stabilizer for my car.

I found that every time when I start my car, the starter motor will draw so
much current that cause the voltage over the ignition coil to drop
tremendously.

Most circuits I found need higher input voltage to produce a lower stable
voltage, but the only voltage source in a car is from the battery. So it's a
12V-12V DC voltage stabilizer that I'm looking for. Any recommendation?

Thanks,
Newbie


.

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