0.30" I.D. CHARCOAL TOROID

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0.5" O.D. 0.10" high. 0.30" I.D. Charcoal.

Average Customer Review:

(8 Reviews)

Customer Comments

Average Customer Review:

(8 Reviews)

james beauchamp from Oklahoma

What's the cutoff f?

Using these as possible Broadcast Band Filters. What's the maximum frequency these can be used for low power apps? Not much tech data because I don't know the specific mix.

A customer from www.innovatia.com

TOR-23 Measured Parameters

The TOR-23 is a soft ferrite toroid with a measured permeance (per-turn^2 inductance) of 850 nH. (For N turns, the inductance is N*N*0.85 uH.) It saturates slowly, with a noticeable upward curvature in the current versus time at around a field-referred current (that is, current as seen by the magnetic field, in ampere*turns) of about 2.5 A*turns, though it should be useable as a power device up to about 7.5 A*turns.

Ferrites have higher permeance but saturate at a lower field-referred current (N*I) than powdered-iron cores, which are usually preferred for components with a large constant (dc) current and small ripple (ac) current. Ferrites have much lower high-frequency power dissipation but saturate at only about 20 % the magnetic field density value of powdered-iron cores. These parts are better used as transformers or coupled inductors in flyback converters or Cuk-based converters.

A customer from Santa Ana, Calif.

Useful for a "Joule Thief"?

I'd like to buy some for use in the "Joule Thief" circuit, which is a blocking oscillator with the LED across the emitter and collector of the transistor. I was thinking that one could stack two of these for more core area. I just didn't want to buy something and find that they're not useful. The toroids I've been using are from RFI suppression sleeves used on mouse cables. They work great but are quite a bit larger. I also use 190uH inductors that are the size of a short 1W resistor. And I've also bought some 100uH inductors from Mouser, so I think this toroid should have about 100uH with maybe ten turns of 24ga., but it's not critical

A customer from California

I seem to be in disagreement

Ooops, I seem to be in some disagreement with other posters. I don't have much experience analyzing inductors so you might take their analysis over mine. (I built a boost LED driver with my core but 30 turns doesn't seem to be enough inductance to drive - I need 100 uh or so and seem to have only 25.)

A customer from California

Seems to be powerdered iron, Mu about 50?

30 turns on this gave me about 25 uH, I think. That works out to a Mu of about 50. That would be an iron not ferrite core? 13mm OD, 8mm ID, 6mm thick.

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