Things to try..

Post by **exxos** » 27 Feb 2020 20:57

I can only currently think of one thing :lol:

In that if someone wants to try this, check the ripple on the power rails on most of the chips.. Then remove the three large SMT caps.. And check the ripple again...

I am really suspecting that those large caps are not needed... There are that many on the board already...I daresay half of them could probably be removed from future boards.

Post by **exxos** » 03 May 2020 13:32

I tried this out as I had to remove a cap anyway..

I chose a "long away gnd point" and with and without the big cap seem to make no odds. Overall just 20mV - 50mV P-P noise which is pretty awesome considering the power point is some inches away from the PSU.

Not checked the SMT cap under the PSU yet, but will do that next...

IMG_5126.JPG

IMG_5127.JPG

EDIT: Similar with that SMT cap under the PSU, makes no odds if its there or not. So those caps are total overkill and not needed it seems :)

stephen_usher · Post by **stephen_usher** » 03 May 2020 13:51

Well that's two fewer components to fit/go wrong! :-)

Post by **exxos** » 03 May 2020 14:20

stephen_usher wrote: 03 May 2020 13:51 Well that's two fewer components to fit/go wrong! :-)

3 ;)

Post by **PhilC** » 03 May 2020 14:50

And those caps aren't cheap either, nice one.

Post by **exxos** » 03 May 2020 15:34

PhilC wrote: 03 May 2020 14:50 And those caps aren't cheap either, nice one.

Yeah , about £1.50 each from mouser. Have seen them £3 and up though as well!

exxos's Atari, Amiga & retro forum

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