Main > Monitor/Video Forum
Arcade monitor isolation transformer.
lilshawn:
i'm just saying, the nature of the regulated supply means the millisecond you plug it directly to mains, it's fried.
if it ran (even if only for a few minutes) it's a switchmode style supply and an isolation transformer is not needed.
it's failure is unrelated to needing an isolation transformer or not.
behrmr:
You can just look at an arcade CRT monitor and tell if it needs an iso. If there's a larger transformer mounted to the chassis then it has it's own switching power supply and doesn't need an ISO. Also the ones that don't need an ISO very often have a 3 prong power connector, not two.
abispac:
--- Quote from: behrmr on March 21, 2020, 11:50:34 am ---You can just look at an arcade CRT monitor and tell if it needs an iso. If there's a larger transformer mounted to the chassis then it has it's own switching power supply and doesn't need an ISO. Also the ones that don't need an ISO very often have a 3 prong power connector, not two.
--- End quote ---
This is what i mean, if you look at this chinese chassis, they dont have a large transformer built in, neither they have 3 prong cord, and they always get connected to the wall without an iso, thats a popular thing to do. Now the monitor im trying to use, it lasted 3 minutes without the iso, so acording to lilshawn , i should be ok, once the chassis had been repaired, right?
behrmr:
--- Quote from: abispac on March 21, 2020, 08:09:36 pm ---
--- Quote from: behrmr on March 21, 2020, 11:50:34 am ---You can just look at an arcade CRT monitor and tell if it needs an iso. If there's a larger transformer mounted to the chassis then it has it's own switching power supply and doesn't need an ISO. Also the ones that don't need an ISO very often have a 3 prong power connector, not two.
--- End quote ---
This is what i mean, if you look at this chinese chassis, they dont have a large transformer built in, neither they have 3 prong cord, and they always get connected to the wall without an iso, thats a popular thing to do. Now the monitor im trying to use, it lasted 3 minutes without the iso, so acording to lilshawn , i should be ok, once the chassis had been repaired, right?
--- End quote ---
As long as you use an ISO you’ll be ok
lilshawn:
see that's the thing... that particular chassis there is one of those end of the run type of monitors i mentioned that are super cheaply made of whatever parts where available...as such, use a weird power supply system not quite regulated....not quite switchmode... and is a crapshoot if it needs isolation or not.
I would describe that one shown as... "make a bunch of DC voltage with a bridge rectifier and a big cap...then use resistors to knock that high voltage down to whatever smaller voltages you need." kind of a power supply. it's a really really dirty way of doing it...but i guess it mostly works. perhaps an UNregulated power supply is an accurate description.