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ramapcsx2 / gbs-control

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Replacing C23 C41 C42 C48 instead of stacking extra capacitors #277

Closed karas84 closed 2 years ago

karas84 commented 2 years ago

So I was wondering what capacitor should I use if I wanted to replace the stock C23 C41 C42 C48 instead of adding an extra one on top of them. I tried to search for schemathics but wasn't able to find any.

Also, reading the forums I found out that, since C41 can be difficult to operate with, it is possible to replace only C43. Is it correct? If yes, should I replace C43 with a bigger (double capacitance) capacitor or just one is fine?

GXTX commented 2 years ago

Mmm docs need updating, really no reason to be stacking caps. But this isn't really an in-development project in the current year.

karas84 commented 2 years ago

Are you sure? According to @ramapcsx2 (both in the readme and in the forums) stacking these caps makes a good difference in terms of image noise filtering.

GXTX commented 2 years ago

There's no reason to stack the caps instead of replacing them.

karas84 commented 2 years ago

So the new ones alone are enough. Ok, thanks.

ramapcsx2 commented 2 years ago

You can stack or replace. Stacking is preferred, since you combine the benefits of 2 capacitors that way.

GXTX commented 2 years ago

I don't see how stacking would be preferred. Replacing with a correctly sized cap is the correct thing to do. The question is /what/ is the correct rated cap.

ramapcsx2 commented 2 years ago

Well, the original caps are the correct size :)

The point of this modification is additional supply stabilization. It's to reduce noise that the original capacitors are insufficient to filter out. Basically this applied: https://www.youtube.com/watch?v=BcJ6UdDx1vg

GXTX commented 2 years ago

Then they are not correct for the mod, it seems pertinent to know what the extra capacitance comes out to and would be more correct to just replace instead of stack, it feels very dirty.

ramapcsx2 commented 2 years ago

I recommend watching the video. It's not at all about the capacitance.

karas84 commented 2 years ago

@ramapcsx2 Very interesting video, thanks. I think I now understand why stacking is better than simply replacing the caps.

ramapcsx2 commented 2 years ago

Appreciate that you watched it, this stuff is pretty tricky, right? :)

karas84 commented 2 years ago

Yeah, things get crazy reeeeeeally fast when moving from theory to real-life :D. Thanks to you for sharing it and for the effort you put into gbs-control!