# Toroidal transformer vs induction coil (choke) confusion

#### MichaelaJoy

##### Active Member
I like dr peppers' idea of using a microwave oven transformer, although in either case you'll have to completely remove the windings and wind from scratch.

Take a look here.
https://www.ebay.com/itm/Power-Tran...064?_trksid=p2349526.m4383.l4275.c10#viTabs_0

The good thing about this toroid is if you need two of them, you can order them, as opposed to the Velodyne
core, which would be considerably more expensive to procure.

The I.D. is 38mm (About 1.5 inches)

andybb said:
If any of you guys need woodworking advice feel free to head over to our version of your site http://lumberjocks.com/
Thank you for you kind offer.

#### andybb

##### New Member
MichaelaJoy Isn't it always the case? Just took an old microwave to the dump that had been in the shed for a year.

The ebay listing is for a ferrite core. Isn't that what is under the windings in my Velodyne toroid? It's got an OD of 4.6" , is 2.6" tall and weighs 5.5lbs. If so, stripping it and wrapping it with as many wraps of 8AWG as I can seems like the easiest solution with the least amount of guesswork regardless of the inductance. No?

One guy said, "I wrapped 8 turns of # 4 wire through an old microwave xfmr that I cut the windings out of and it still works awesome."

I know you guys hate it when a hack like me tries to do stuff that really should be done "more correctly", like when a guy on a forum wants to brush on minwax when he should be HVLP spraying conversion varnish.

Last edited:

#### MichaelaJoy

##### Active Member
It should be close, yes. The idea is to provide you with a source so that you don't have to rip that toroid apart.
That's a job in itself

Besides... where would you get the second toroid from? He stacks two of them to get more inductance, which means a cleaner DC voltage.

As far as 'hacking' things goes, my only concern is that you do not get hurt. I'm sure that everyone else here feels the same way.

I can't stress it enough. You're dealing with dangerous voltages and currents. I don't weld, so I don't know the ins and outs of welding.

But I know enough to be careful.