English Amiga Board

Go Back   English Amiga Board > Support > support.Hardware

Thread Tools
Old 14 April 2020, 02:33   #21
Registered User

Join Date: Nov 2014
Location: NSW/Australia
Posts: 384
By which time you might as well have just bought a picopsu or clone: https://www.mini-box.com/picoPSU-160-XT

I wonder how much ripple actually affects an A500. Many people use meanwell and cisco replacements with no issues.

It wouldn't surprise me if Commodore just picked some ideal specs out of thin air to send to their PSU manufacturers or to just publish in their manuals.
dalek is offline  
Old 14 April 2020, 10:04   #22
Registerdeaded abUser

Join Date: Sep 2013
Location: Beyond the Wall
Age: 43
Posts: 94
Although ripple is a problem, I don't think it is a big deal with solid state power supplies. With switch mode supplies on the other hand this is a huge deal on sensetive equiptment. If this is the case with Amigas, I don't know and I don't really care because I don't suffer instability issues.

But to be fair with Jens it sounded that he was concerned with instabilities with future (and maybe present) accelerator boards and expansions. Might be a real case at specific frequencies on boards and their EMI (electromagnetic interference)?
theq is offline  
Old 15 April 2020, 01:27   #23
Registered User

Join Date: Nov 2016
Location: Black Forest / Germany
Posts: 10
I really liked his presentation. Finally we got some data instead of assumptions and hearsay.

Jens' biggest problem is hotplugging USB devices on the Rapidroad. Sudden changes in current consumption usually lead to PSUs compensating the associated voltage changes which might result in over- or undershoot.

But... to be honest, that has never been a problem in the past, even with a CDROM and a CD-Burner spinning up at the same time and a harddisk used as a buffer. No crashes, no hickups, and most importantly no components dying on the mainboard or on any connected expansion boards.

Compare that to the cheapest of the shittiest Chinese USB Controller PCI cards. You can plug und unplug stuff all day long and that thing just works. I personally doubt you can even measure the slightest voltage change on the card in the PCI slot next to it.

Still, hats off to Jens for the research and the presentation. IMHO it was the most useful talk from this year's Revision.

Last edited by LooZee; 15 April 2020 at 01:35.
LooZee is offline  
Old 15 April 2020, 19:39   #24
Registered User
Join Date: Sep 2006
Location: New Sandusky
Posts: 746
Originally Posted by Mathesar View Post
I think that the stories about bad electrolytics are often overrated. I still use them quite a lot in the circuits I design.
A lot depends on the manufacturer and how the caps are used in the circuit.
Stick with the likes of Rubycon, Panasonic, etc. Keep the ripple current low and keep them cool and they will work forever.
Yes and no. Good electrolytic caps from that era can last for decades when stored right and when not abused electrically. Sometimes though there's a microscopic flaw in the case that causes the electrolyte to leak slowly over years that simply couldn't have shown up in QA testing.

That said, caps seem to be a race to the bottom these days. I think the bad Chinese cap debacle of the 2000s set a new lower baseline for how bad a cap can be and as a result even quality brand caps aren't as good as they used to be.
AmigaHope is offline  

Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
Thread Tools

Similar Threads
Thread Thread Starter Forum Replies Last Post
Revision 2020 introvert edition stream party Shoonay Amiga scene 5 29 April 2020 11:35
Is my Amiga CD32 original PSU stable in 2020? leeuwtje support.Hardware 5 12 March 2020 04:16
Is Jens Schoenfeld (iComp) leaving the Amiga Scene? Overmann Amiga scene 233 20 February 2020 11:56
New Amiga motherboards from Jens mjnurney News 721 02 January 2018 14:12
revision demo party 2013 excellent !!! turrican3 Amiga scene 23 14 April 2013 20:11

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump

All times are GMT +2. The time now is 17:26.

Powered by vBulletin® Version 3.8.11
Copyright ©2000 - 2020, vBulletin Solutions Inc.
Page generated in 0.06125 seconds with 13 queries