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Electronic circuit : Simple but reliable car battery tester

Electronic circuit : Synchronized multi-spark module (SMSM) for Electronic Ignition Devices (EID)

Multi-spark ignition is very useful especially in the case of startings at low temperature and at low rpm range.

Electronic circuit : Automotive 12V to +-20V converter (for audio amplifier)

The limitation of car supply voltage (12V) forces to convert the voltages to higher in order to power audio amplifiers.
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