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MOT series

DerStrom8

Super Moderator
Most Helpful Member
#2
No, that is not correct. And to be honest, if you have to ask then you should not be doing this. MOTs are EXTREMELY dangerous. You won't get a second chance. You hook up something wrong and you'll die instantly without knowing anything happened.
 

unclejed613

Well-Known Member
#3
with the amount of current available from a MOT you're playing russian roulette, especially if you aren't sure what you are doing. DerStrom is right, you won't know what hit you. do not continue your project without expert help. (in person, not over the internet)
 
Thread starter #4
How am i playing russian roulette with a 5 foot chicken stick with 2 mot's im planning to submerge in mineral oil? Wearing rubber gloves and insolation shoes, i appreciate your concerns but i'm always verry carefull when handeling hazardous voltages.
I would get "expert help" but since i have no idea who id need to ask the internet is my best shot.
 

DerStrom8

Super Moderator
Most Helpful Member
#6
agreed but im not in close proximity when its running

I dont see how hooking up mots incorrectly will do anything else but trip the breaker or burn the transformer.
My point is it's critical to be over-cautious when playing with high voltage and high current devices. For example if something is connected incorrectly, you could go to plug in the MOT and have high voltage jump to the mains cable you're holding in your hand. It's not likely, but anything's possible. You can't rule anything out.

Anyway, I was at work earlier and was distracted, and misread your schematic. Yes, it will work the way you drew it. Don't forget to ballast your MOTs though. As I am sure you are aware, they are not inherently current-limited.
 
Thread starter #7
My point is it's critical to be over-cautious when playing with high voltage and high current devices. For example if something is connected incorrectly, you could go to plug in the MOT and have high voltage jump to the mains cable you're holding in your hand. It's not likely, but anything's possible. You can't rule anything out.

Anyway, I was at work earlier and was distracted, and misread your schematic. Yes, it will work the way you drew it. Don't forget to ballast your MOTs though. As I am sure you are aware, they are not inherently current-limited.
I have this transformer from an old stereo, do you think this would work as a ballast or should i just use another mot as ballast?
 

DerStrom8

Super Moderator
Most Helpful Member
#8
I have this transformer from an old stereo, do you think this would work as a ballast or should i just use another mot as ballast?
Personally I would use another MOT. They're rated for higher power than most of the types of transformers you'd find in old stereos. I usually put a third MOT with the primary in series with the HOT wire on the mains cord, and short the secondary coil. This serves as a pretty decent ballast.
 

unclejed613

Well-Known Member
#9
i'm always verry carefull when handeling hazardous voltages.
sorry, i'd rather you be alive to be upset at me, than not alive. we do get a good amount of posts here that sound like "i'm a total noob and want to build an X-ray machine as my first project" (or even worse, it's already built and they want to know how to tell whether it's working or not).

you didn't mention if the transformers are identical or not (same make/model/part number). to get the voltages to add, you might want to check the phasing of the secondaries. some secondaries are grounded internally in the transformer, so your ground point for that particular transformer can't be changed. if the secondaries are internally grounded, and grounded at the same end, you might need to wire the two primaries out of phase, rather than in phase.
 
Thread starter #10
sorry, i'd rather you be alive to be upset at me, than not alive. we do get a good amount of posts here that sound like "i'm a total noob and want to build an X-ray machine as my first project" (or even worse, it's already built and they want to know how to tell whether it's working or not).
I'm not planning on building an xray since i don't want to die from berylliosis and/or cancer.

Also although being a big step up from zvs flyback drivers i'm not a complete noob regarding high voltages

i also work with mains voltage on a day to day basis and i have only gotten zapped like once(wasen't even my fault)
52170461_1915838015192260_4153889491616006144_n.jpg 51387318_400530774085074_6639413853522231296_n.jpg
The current mots i have are different models( although similar ) but ill be looking into finding a 3d thats the same as one of the previouse models and use the other one as ballast.

(also i'm not upset, very gratefull for a comunity who cares about my wellbeing)
 

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