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1
**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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**Operating Principles Right Hand Rule**

For a Solenoid Reversing Current Direction Reverses the Flux B [tesla] B I [Amps] L1 [H] I [Amps]

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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**

B1 Lossless 1 mA B1+B2 =0 1 mA B2

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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 Don’t 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

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**Winding Bifilar Inductors Additive**

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**

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**4:1 Ferrite Transformer Bifilar Wound**

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

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**4:1 Ferrite Transformer Bifilar Wound**

Zin = 50 Ohms Zload = 200 Ohms a b 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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