I salvaged couple of CRT TVs and took out the flyback transformers out in hopes to create an AC to AC dropdown transformer or a electro magnet.

I have been trying to find good tutorials on the two above and it looks like most folks are only interested in creating arc with the flyback.

If you can share some good links to projects with a flyback I would appreciate that.

Thank you,

-B

 

A flyback transformer is a step-up transformer and given the very large turns ratio it would not provide any useful voltages if used as a step down transformer. So don't bother wasting time that way. IF you are able to recover the wire, much of it is good for other transformers but not high powered ones.

 

A flyback transformer is a step-up transformer and given the very large turns ratio it would not provide any useful voltages if used as a step down transformer. So don't bother wasting time that way. IF you are able to recover the wire, much of it is good for other transformers but not high powered ones.

What about an electormagnet ?

 

What about an electormagnet ?

You do know that they are wound on a ferrite core don't you? Ferrite's don't don't work well as electromagnets. where is also the very small gauge of wire in them.

 

You do know that they are wound on a ferrite core don't you? Ferrite's don't don't work well as electromagnets. where is also the very small gauge of wire in them.

No i did not, this is my first time getting my hands on one. So i was looking at ways to use it besides just making arcs.

 

In the latter decades before the CRT was rendered virtually obsolete, the flyback transformers for them became largely useless for anything other than generating a high voltage using them as-made. The windings are usually encapsulated ("potted") to keep out dirt and moisture and getting the core out without breaking it is often impossible.

 

You can get a microwave oven at dump and recover the transformer there,
Then cut out the secondary winding (which is real HV) and rewind with lower
turns to get a lower V. Lot of folks making welders out of them. Lots of YouTube
videos on this. Note do not mess around with the magnetron unless you use a
mask. Folks recovering magnets but there is a beryllium oxide seal that is like
deadly. Make your will out prior to the attempt.

Regards, Dana.

 

To do anything with the transformer from a microwave oven you will also need to remove the magnetic shunt pieces, or the resulting transformer will be disappointing. And most of the transformers have the laminations welded, making then very difficult to rewind.
I have removed the magnets a few times with no bad results. The secret is to not break or smash any parts of the tube.

 

MOT Shunts -

https://4hv.org/e107_plugins/forum/forum_viewtopic.php?142201

https://forum.allaboutcircuits.com/threads/remove-shunts-in-microwave-oven-transformer.145473/


Regards, Dana.

 

The second link leads to my previous comments about rewinding microwave oven transformers, and they are certainly just as valid for this discussion. Rewinding a transformer without being able to remove the laminations would certainly get tedious quite rapidly, at least I think that it would. And don't forget about covering the sharp edges to protect the insulation. That is very important.

 

Rewinding a transformer without being able to remove the laminations would certainly get tedious quite rapidly, .

This is one reason I always prefer Toroidal for this.
One of my first EI many decades ago was where I removed all lamination's in order to wire the secondary bobbin for all the different switch-selectable valve heater filaments!
Definitely Toroidal's make it much easier to add overwind or reduce a secondary.
Max.

 

MOT Shunts -

https://4hv.org/e107_plugins/forum/forum_viewtopic.php?142201

https://forum.allaboutcircuits.com/threads/remove-shunts-in-microwave-oven-transformer.145473/


Regards, Dana.

Nice links, thank you

 

In the latter decades before the CRT was rendered virtually obsolete, the flyback transformers for them became largely useless for anything other than generating a high voltage using them as-made. The windings are usually encapsulated ("potted") to keep out dirt and moisture and getting the core out without breaking it is often impossible.

I gave it a try and you are right, can't really do anything with them.

 

Litz wire from both flyback transformers and also some video monitor deflection yokes is still great for RF coils because it has lower loses. It is a bit tedious to recover but quite useful for those coils. Also, nost switching mode power supplies need at least one inductor, and almost EVERY switching power supply needs an incoming line filter, which would include a higher current capability bi-filar wound choke, easily made from a flyback core.