mar.vel.ous Posted March 24, 2019 Share Posted March 24, 2019 Hi guys, What is the benefit of an ATX PSU over those regular min dong switching PSU’s. From what I’ve gathered a PC PSU is better? Sent from my iPhone using Aussie Arcade Link to comment Share on other sites More sharing options...
Frank_fjs Posted March 24, 2019 Share Posted March 24, 2019 PC ATX generally have better build quality and safety features, but do not allow for adjustment of the +5V rail. Also, only older ones pre 2003 have -5V. I've been using Mean Well power supplies, available from Mouser at good prices. RT-125A is a good triple output supply with plenty of amps. RT-85A is the same but smaller with fewer amps. RT-65A is tiny but once again, less amps. Link to comment Share on other sites More sharing options...
Tangles Posted March 24, 2019 Share Posted March 24, 2019 I agree with @Frank_fjs. I will pay the money for a Meanwell supply if it’s a machine I care about. Buying from a reputable source is important as there are a lot of fakes. Link to comment Share on other sites More sharing options...
Nimmers Posted March 25, 2019 Share Posted March 25, 2019 +1 for the Meanwell power supplies. They are great, get them from somewhere like Mouser because there are counterfeit ones out there Link to comment Share on other sites More sharing options...
Womble Posted March 25, 2019 Share Posted March 25, 2019 +1 for Meanwell. The main benefit of an ATX PSU is that the 5V output is regulated so your 5V will stay at 5V for whatever board you connect, whereas an arcade PSU will need adjustment as you change PCBs to ensure the 5V is correct. That plus they are easy to find. But - ATX PSUs have a range of voltage outputs that are not used in arcade land, and it's a bad idea to run a switch-mode PSU with no load on it's outputs. Modern PCs put a lot of load on the 12V rail, and on most arcade boards the only thing using the 12v rail is the tiny amplifier IC This is pretty close to "no load" from the ATX psu's perspective, when compared to what it was designed for. Basically the older ATX models, or the even older AT PSUs, would be a better choice if they weren't now very old and horribly unreliable. In theory ATX PSUs are of a higher quality, but there are a lot of crappy PSUs around with more money spent on bling and marketing than on the actual component or design. Any cab I restore gets a dedicated Meanwell PSU, they cost about as much as a Yum Cha Ming Dong, or a Peter Chou clone PSU of unknown origin. I might use an ATX PSU for a test bench supergun but I wouldn't fit one in a cab long term. Link to comment Share on other sites More sharing options...
Frank_fjs Posted March 25, 2019 Share Posted March 25, 2019 If it helps, Altronics stock the Mean-well RD-65A, as seen in the background of above picture. Quite a compact and decent quality dual output PSU, with 6A on +5V and 3A on +12V. Negative 5V isn't needed on a majority of boards and 6A is adequate for most single layer boards. CPS2 draws around 3.5A for reference. Handy tip if you want to pick up something quickly and locally. RT-125A is the larger power supply in the foreground, for size reference. Link to comment Share on other sites More sharing options...
Beavisbeaver Posted March 30, 2019 Share Posted March 30, 2019 I run Meanwell in all my cabs. Link to comment Share on other sites More sharing options...
cps2luva Posted March 30, 2019 Share Posted March 30, 2019 +1 for Meanwell, ran a hei-ma arcade psu which was okay for about 10 months use off and on until I heard a gunshot in the other room... which turned out to be a a cap exploding lol invest in quality :D Link to comment Share on other sites More sharing options...
waali Posted March 30, 2019 Share Posted March 30, 2019 Meanwell here Link to comment Share on other sites More sharing options...
MarkOZLAD Posted April 6, 2019 Share Posted April 6, 2019 I run ATX PSU in my new cab. A 550W who knows the brand. I really like it, I run my Wonderboy board or switch to the RaspberryJAMMA. I run LEDs on my buttons and a strip of LEDs in the marquee box, both are off the 12V line. The 5V line seems to sit on about 4.85V which I’m told is fine. The 12V line I haven’t tested in a while and I’m not sure exactly what it sits on. No -5V bit I don’t need it. As others have stated, there is no adjustment available, though I’ve not needed it. FYI I have an RGB Modded CRT TV in my cab, I have a powerboard in the cab to plug in both the ATX PSU and TV. No isolation transformer. This is obviously quite a different setup from a genuine arcade cabinet. Sent from my iPhone using Aussie Arcade Link to comment Share on other sites More sharing options...
mar.vel.ous Posted April 7, 2019 Author Share Posted April 7, 2019 (edited) Power Supply No point in making a new thread I just need to ask. What is the approximate depth of an 18” crt monitor. Total depth from the middle most outer point of the curved tube to the neck board or whatever sticks out the furthest. Also, the length from behind the wooden frame you need to mount it on (length of what sticks out from the back) I need to know to see if one would fit into my cabinet Sent from my iPhone using Aussie Arcade Edited April 8, 2019 by mar.vel.ous Link to comment Share on other sites More sharing options...
djcalle Posted September 8, 2019 Share Posted September 8, 2019 Sorry to revive the thread but thought it was relevant. I'm looking to buy one of the MeanWell PSUs. Have found this webiste and wondering if it is a trusted source or better go with Mouser? https://www.power-supplies-australia.com.au/MEAN-WELL-RT-85A Also, Altronics doesn't have the RT-65A listed on their website. I have sent them an email to confirm. Link to comment Share on other sites More sharing options...
Frank_fjs Posted September 8, 2019 Share Posted September 8, 2019 Altronics and Jaycar stock and sell the RD-65A. This is the dual output version, +5V and +12V. They don't have the RT (triple output) series. I prefer Mouser / Digikey as they're cheaper. Link to comment Share on other sites More sharing options...
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