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Components and Circuits For discussions about component types, alternatives and availability, circuit configurations and modifications etc. Discussions here should be of a general nature and not about specific sets.

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Old 18th Jul 2017, 8:57 am   #1
jonnybear
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Default Use of a toroidal 10.6ohm 1870mH

I have just uncovered a couple of 10.6 ohm 1870mH toroidal chokes, inductors?, must have had them for years, do not know where they came from or what they were intended for. any help would be appreciated.
John
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Old 18th Jul 2017, 9:22 am   #2
Radio Wrangler
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Default Re: Use of a toroidal 10.6ohm 1870mH

Chokes normally need an air gap to control the amount of inductance and to get the saturation current up to a useful value. That isn't so easy in a toroid, so often the toroids are dust cores. GEC ( SEI, Heywood Lancs) and Arnold Engineering (US) made ranges of toroids with different metal powders to give somewhat higher Al values than ferrites. Some were made of powdered mumetal. The spaces between the particles act as a distributed air gap.

The common telephone line loading coils were 18mH so at 1.8H, yours aren't those.

David
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Old 18th Jul 2017, 9:59 am   #3
Craig Sawyers
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Default Re: Use of a toroidal 10.6ohm 1870mH

I've seen very similar looking inductors in old mil spec electronics units, I think used in filters, so operating at low ac currents. Hence no need for an air gap.

Just as a for instance, if it was part of a synchro filter operating at 400Hz, the coil Q would be >400 (wL/R) so a very good LC filter could be configured with those coils.

Assuming that the core is lossless of course. A few experiments with a capacitor or two to resonate in the 100Hz to 1kHz region, and a signal generator would be a good starting point to work out what you have.
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