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Old 5th January 2007, 03:45 AM   #1
jesserparker is offline jesserparker  United States
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Default toroids

anybody know of a good source for toroids here in the us? i know parts express has avel-lindbergs, but that seems to be the only place i can find that sells them not in quantity.
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Old 5th January 2007, 04:04 AM   #2
bushroot is offline bushroot  United States
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Old 5th January 2007, 03:04 PM   #3
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Antech/Par-metal has a real good selection . Allied Electronics , newark and I believe mouser handle the Hammond toroidals and the Avel's at partsexpress
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Old 5th January 2007, 03:58 PM   #4
CBS240 is offline CBS240  United States
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Here you can also get prewound/insulated primaries and wind your own secondary(s) for a particular application
All the trouble I've ever been in started out as fun......
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Old 5th January 2007, 05:02 PM   #5
Chartal is offline Chartal  Canada
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Anyone try to wind there own toroid with Alpha-Core
They have core with pre-winding primary from 46VA (12$) to 2600VA (85$)
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Old 5th January 2007, 05:40 PM   #6
bikehorn is offline bikehorn  Canada
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alright, i'm interested in the DIY winding aspect...but i have to wonder, just how do i wind a secondary? do you just wrap the magnet wire around the core by hand? that seems a little tedious and sounds like it could compromise the end result.
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Old 5th January 2007, 06:48 PM   #7
taj is offline taj  Canada
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They stock 80 VCT toroidals intended for Leach Amp projects (120v Prim.), but offer anything else you need.

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Old 5th January 2007, 07:44 PM   #8
HipoFutura is offline HipoFutura  United States
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Bought mine directly from Avel: http://www.avellindberg.com/contact.htm

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Old 6th January 2007, 06:04 AM   #9
unclejed613 is offline unclejed613  United States
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actually, toroids are pretty forgiving for handwinding technique. the only place you run into trouble for sloppy windings is at higher frequencies, where you have to contend with inter-turn capacitances. you might want to dip your finished transformer in lacquer or rubber tool handle coating to reduce magnetically induced wire "buzz". all you really need to do for calculation is figure out the required turns ratio, and figure out your correct secondary wire size. you can use just about any type of wire you want for the secondary. i prefer teflon insulated when i can afford it, the insulation is thinner than PVC insulation, so you can get higher turn densities (not as high as enameled wire though), and will not cause shorted windings if A> run too hot, or B> the equipment takes a lightning hit (common here in Colorado).

i've hand wound many toroids for many different uses, and they are much easier to wind than EI core transformers (unless you have an EI core that comes apart so you can take the bobbin out). if somebody wants to build a toroid from scratch, i recommend using the toroid from a computer monitor or TV deflection yoke. they're not as compact as a commercial power toroid (they're kind of funnel shaped, instead of flat), but if you get an old dead TV or monitor, they're free...... and yes they CAN be used for 50/60hz, after all most TVs and computer monitors use 50 or 60hz vertical sweep. make sure to cover the core with some type of insulation, such as tape if you use varnished magnet wire. ferrite is a ceramic, and magnet wire enamel scrapes off easily. also isolate your primary and secondary with at least 2000V worth of insulation, if you use something like black tape, the package should tell you what the voltage rating of the tape is per layer (i don't recommend black tape because it dries out and gets brittle eventually, but i am using it as an example).
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