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Chipamp IC amp kits & PC boards from ChipAmp

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Old 25th February 2018, 10:34 PM   #81
Hogwild is offline Hogwild  Canada
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Bill_P

Thanks. Actually this was one of the wrong boards for the amp I wanted to build. Same board, but resistors result in higher gain. For the boards that I already finished with the lower gain, I need to test those. That leads to my next question, which I'll post elsewhere.

BTW, I don't understand something-why is it that the connection I made on the POT got rid of the hum. I mean, I didn't actually connect anything to ground, did I?

Thanks
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Old 25th February 2018, 10:48 PM   #82
scottjoplin is offline scottjoplin  Wales
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Often hum is the result of a connection to earth/ground causing a loop with other wires/equipment also connected to ground. It isn't the ground itself that causes the hum, rather it is this loop that makes a very good aerial that picks up electromagnetic interference. This may help you understand and is very useful info for making your amplifier hum free. http://hifisonix.com/wordpress/wp-co...tober-2017.pdf
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