First Chip Amp

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rail

rail is a term used to indicate a power supply terminal. I've normally heard in in the use of +- split supplys. It refers to the +ve or -neg terminals. Think of the power supply as 2 series connected batteries. you have a + a - and a center terminal which is normally refered to as ground. so 9900uf per rail is 9900uf between the + and ground and another set between - and ground.
 
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