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The BMW Range
3 Series
E46
[DIY] Amplifier IC upgrade
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<blockquote data-quote="tropos_net" data-source="post: 514602" data-attributes="member: 2595"><p>the pin#9 shown is the head unit pinout. do not confuse this pin for the Vcc pin of the chip. whatever appears on that pin #9 does not go directly to the Vcc leg of the chip. that means between the pin #9 on the head unit and the chip amp, there is a DC to DC convertor. if this convertor is not beefed up, it will not pump current per design.</p><p> </p><p>section 2.1 of the spec sheet, the chip needs to operate between 18V to 28V on Vccc with 50V peak voltage. how are you going to do that from an average 12V car battery supply? ....ans: DC to DC convertor</p></blockquote><p></p>
[QUOTE="tropos_net, post: 514602, member: 2595"] the pin#9 shown is the head unit pinout. do not confuse this pin for the Vcc pin of the chip. whatever appears on that pin #9 does not go directly to the Vcc leg of the chip. that means between the pin #9 on the head unit and the chip amp, there is a DC to DC convertor. if this convertor is not beefed up, it will not pump current per design. section 2.1 of the spec sheet, the chip needs to operate between 18V to 28V on Vccc with 50V peak voltage. how are you going to do that from an average 12V car battery supply? ....ans: DC to DC convertor [/QUOTE]
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[DIY] Amplifier IC upgrade
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