Things to try..

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exxos
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Things to try..

Post by exxos »

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.
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Re: Things to try..

Post by exxos »

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...


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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 :)
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viewtopic.php?f=17&t=1585 Have you done the Mandatory Fixes ?
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Re: Things to try..

Post by stephen_usher »

Well that's two fewer components to fit/go wrong! :-)
Intro retro computers since before they were retro...
ZX81->Spectrum->Memotech MTX->Sinclair QL->520STM->BBC Micro->TT030->PCs & Sun Workstations.
Added code to the MiNT kernel (still there the last time I checked) + put together MiNTOS.
Collection now with added Macs, Amigas, Suns and Acorns.
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Re: Things to try..

Post by exxos »

stephen_usher wrote: Sun May 03, 2020 1:51 pm Well that's two fewer components to fit/go wrong! :-)
3 ;)
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Re: Things to try..

Post by PhilC »

And those caps aren't cheap either, nice one.
If it ain't broke, test it to Destruction.
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Re: Things to try..

Post by exxos »

PhilC wrote: Sun May 03, 2020 2:50 pm 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!
https://www.exxosforum.co.uk/atari/ All my hardware guides - mods - games - STOS
https://www.exxosforum.co.uk/atari/store2/ - All my hardware mods for sale - Please help support by making a purchase.
viewtopic.php?f=17&t=1585 Have you done the Mandatory Fixes ?
Just because a lot of people agree on something, doesn't make it a fact. ~exxos ~
People should find solutions to problems, not find problems with solutions.
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