| 1. | They are gradually replacing iron cored transformers in neon signs.
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| 2. | This resonant current directly drives a switching transistor through a ring core transformer.
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| 3. | During the 1950s he invented the insulating-core transformer, producing high-voltage direct current.
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| 4. | Tight coupling is when the coupling coefficient is around 1 as with conventional iron-core transformers.
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| 5. | It has a circular cross-section due to a poloidal graphite limiter and an iron core transformer.
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| 6. | Ferrite-core transformers are widely used in ( intermediate frequency ) ( IF ) stages in superheterodyne radio receivers.
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| 7. | In the closed-core transformer the iron core is a closed ring around which the two coils are wound.
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| 8. | This Joule heating reduces efficiency of iron-core transformers and electric motors and other devices that use changing magnetic fields.
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| 9. | The 3-core transformers are oil-cooled, to which the control unit with its 28 running steps is connected.
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| 10. | Early superheterodyne receivers used IFs as low as 20 kHz, often based on the self-resonance of iron-cored transformers.
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