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Message: <blockquote data-quote="kenchoo" data-source="post: 1063859537" data-attributes="member: 127642">This is cool, but I am not an expert in Car ECU, but if you are you should notice not all cap in ecu are rate 63v; some are 35v, 20v and even 10v cap.But normally the cap were have 20% tolerance(mean 16.5v were tolerance up to 19.8v) and I use only 3 x 5.5v 1f low ESR supercap to reduce the cost, it's very expensive of these supercap. Properly I may add 1 or 2 supercap to make it 22v or 27.5v but i don't think it necessary. My VS work fine and I use diode to protect my device and LED to discharge it power when turn off.(Currently I use just normal diode but not TVS diode or avalanche diode )May be I were add on one Zener diode for better protection, after considered your advise. I have to ask my brother in law whether he stock TVS diode or not, he own an electronic component shop in Melaka. But his shop don't stock supercap I order online. But anyway thank for your suggestion.For those who use normal cap to DIY VSD can considered your advise since there is not much different in cost just connect the 4x16v cap in series to make it 64v. Or any 35v connect in series of 2 to make it 70v. Or if 63v cap also can but of course more expensive than the 16v and 35v. Higher voltage cap or low voltage cap don't affect the capacity of the capacitor;63v 10000uf have same capacity storage as 16v 10000uf. So by connect 4x16v 10000uf cap in series(to 64v then parallel with car 12v source), were be far more less cost then connect 4x63v 10000uf cap in parallel with car 12v source.</blockquote>

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