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Published byJennifer Schwartz Modified over 2 years ago

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Bifilar Wound Toroids Session 2 –Ferrite Transformers for Matching Amplifiers –Ferrite Cores for Transmission Lines/Baluns, EMI –Powdered Iron High Q inductors: Increased Inductance FT :1 Transformer Ferrite

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I [Amps] B [tesla] L1 [H] Reversing Current Direction Reverses the Flux Operating Principles Right Hand Rule For a Solenoid I [Amps] B

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Operating Principles Right Hand Rule For a Solenoid A simple Experiment with a compass Demonstrated in Lab

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Ideal Transformers N1=N2 Identical Windings Lenz and Faraday 1 mA B2 B1 B1+B2 =0 Lossless

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Series Connection of Inductors Bifilar Winding: Additive L1=L2 Leq= L1+L2+2M Leq = 4L1 if M = L1 Wind one Inductor: 10 Turns Bifilar Lead Length = 1.5 inches Dont solder windings yet Measure Single Turn Inductor LC mtr Solder Connections Measure Bifilar Inductor LC mtr Measure input impedance with AIM Compare Single turn and Bifilar Inductance Lbifilar #26 Gauge Yellow Core a b

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Winding Bifilar Inductors Additive a b b a a a b b Layout wires per top left drawing. Check continuity Connect per top right: Solder a dot to b

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Series Connection of Inductors Bifilar Winding: Subtractive L1=L2 Leq= L1+L2 - 2M Leq = 0 if M = L1 b a

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Make one transformer: 10 Turns FT50-43 material Use #26 Gauge wire and supplied BNC connector Measure input impedance with AIM Impedance meter 2 mA 1 mA Subtractive Currents No flux in Toroid 4:1 Ferrite Transformer Bifilar Wound Zin = 50 Ohms Zload = 200 Ohms 1mA b a b a

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4:1 Ferrite Transformer Bifilar Wound Zin = 50 Ohms Zload = 200 Ohms b a b a b is ground.. Bend end up to label a dot is connected to 200 Ohm resistor Connect b dot to a : insert into center pin of connector

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