I'm still working on my NESp (albeit very slowly), and recently wired it so my battery and power supply can be connected at the same time. When they are both connected, I get a hum through the audio channel.
If it matters, the battery is a NI-MH
Any Ideas why it does this or how one might fix it?
Battery Hum
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- The Earl of Sandwich
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- CronoTriggerfan
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- The Earl of Sandwich
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across the input. like:
try something like 100uF - 1000uF electrolytic or 10uF - 100uF tantalum to start. careful, they are direction-sensitive (backwards = explosion)
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|+ |-
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|-|(-| <- thats a capacitor
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v v
(to system)
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- The Earl of Sandwich
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hm well im not 100% sure that that is your problem.
still, 10uf electrolytic (as it probably is) might be a bit low to take care of the kind if ripple you might be dealing with.
keep the 10uf one there, and try to find a 100+uf one to put in parallel with it. reason is that the ESR on big caps might be a bit high to handle higher frequencies, but the capacitance of small caps might be too low to smooth it out. so you kinda get both working together.
sorry if i explaned that bad, i dont have a very firm grasp on the knowledge myself. someone like codeman could probably clear it up a bit.
still, 10uf electrolytic (as it probably is) might be a bit low to take care of the kind if ripple you might be dealing with.
keep the 10uf one there, and try to find a 100+uf one to put in parallel with it. reason is that the ESR on big caps might be a bit high to handle higher frequencies, but the capacitance of small caps might be too low to smooth it out. so you kinda get both working together.
sorry if i explaned that bad, i dont have a very firm grasp on the knowledge myself. someone like codeman could probably clear it up a bit.
"Linux is only free if your time is worthless"