Audio Transformers

Audio Transformers are transformers designed to be used in the amplifiers and high-frequency audio and voice circuits, for coupling ad impendence matching applications. The transformers allow an AC input signal to produce a related AC output signal without the input and the output being physically connected together. This is accomplished by having two or more coils of insulated wire wound around a magnetic metal core. When the AC signal passes through the input winding, a related AC signal appears on the output winding via the inductive coupling.
Audio Transformers perform several functions:
• They can step up (increase) or step down (decrease) a signal voltage
• They can increase or decrease the impedance of circuit
• Convert the circuit from unbalanced to balanced and from balanced to unbalanced
• Block DC current in a circuit while allowing the AC current flow
• They electrically isolate one audio device from another

There are two main types of transformers:
• Step-up / Step-down transformers – The primary and the secondary coils have a different number of windings, that means they have different impedances. Different impedances cause the signal level changed as it goes through the transformer.
• 1:1 transformers – Each coil has exactly the same number of windings which makes the impedance identical. This transformer doesn’t change the signal level but guarantees the physical electrical insulation between coils. These transformers are usually called Isolation Transformers.

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Description Price Primary Impedance Secondary Impedance Primary DC Resistance Power Rating Current Rating Secondary DC Resistance Dimensions Mounting Type Termination Type Weight Depth Diameter Length Width
RS stock no. 106-8577
Mfr. Part No.DA103C
R 22.646
Each (In a Tube of 50)
units
- - - - - - 9 x 6.35 x 10.16mm Through Hole - - 10.16mm - 9mm 6.35mm
RS stock no. 715-6911
Mfr. Part No.DA103C
R 35.05
Each
units
- - - - - - 9 x 6.35 x 10.16mm Through Hole - - 10.16mm - 9mm 6.35mm
RS stock no. 210-6374
Mfr. Part No.E187B
BrandOEP
R 112.87
Each
units
3kΩ 250 Ω, 500 Ω 80Ω 5mW - 46Ω 27 x 20 x 21mm PCB Mount - - 21mm - 27mm 20mm
RS stock no. 123-7198
Mfr. Part No.A187A10C
BrandOEP
R 420.32
Each
units
140kΩ 1 + 1kΩ 3.2kΩ - - 314Ω 29.4 x 25 x 24.2mm Through Hole PC Pin 56g 24.2mm - 29.4mm 25mm
RS stock no. 174-0620
Mfr. Part No.LM-NP-1001-B1L
BrandBourns
R 34.26
Each
units
- - - - - - - - - - - - - -
RS stock no. 123-7237
Mfr. Part No.V78A01F
BrandOEP
R 1,167.84
Each
units
5.6kΩ 4 Ω, 8 Ω, 16 Ω 100Ω 25W - 432Ω 100 x 84 x 68.6mm Panel Mount Solder 2kg 68.6mm - 100mm 84mm
RS stock no. 172-8110
Mfr. Part No.LM-NP-1001-B1L
BrandBourns
R 26.306
Each (In a Bag of 28)
units
- - - - - - 17.7 x 17.7 x 12.6mm Chassis Mount - - 12.6mm - 17.7mm 17.7mm
RS stock no. 123-7203
Mfr. Part No.A187A15C
BrandOEP
R 627.92
Each
units
110Ω 11kΩ 20.2Ω - - 1.59kΩ 29.4 x 25 x 24.2mm Through Hole PC Pin 56g 24.2mm - 29.4mm 25mm
RS stock no. 210-6425
Mfr. Part No.A262A3E
BrandOEP
R 239.40
Each
units
150Ω 600Ω 20.6Ω 1mW Hz @ 30, 100mW Hz @ 300 - 1143Ω 28 x 22 x 23.2mm Through Hole Pin - 23.2mm - 28mm 22mm
RS stock no. 210-6532
Mfr. Part No.D29A100
BrandOEP
R 454.75
Each
units
- 4 → 16Ω 191.5Ω 1 W, 2 W, 5 W, 15 W, 30 W - 0.2Ω 105.5 x 65.5 x 58mm Chassis Mount - 1kg 58mm - 105.5mm 65.5mm
RS stock no. 210-6352
Mfr. Part No.X187B
BrandOEP
R 770.62
Each
units
600Ω 50kΩ 30.9Ω - - 1520Ω 34 (Dia.) x 31mm Chassis Mount Termination Wire 100g 31mm 34mm - -
RS stock no. 172-8670
Mfr. Part No.SM-LP-5001E
BrandBourns
R 20.743
Each (On a Reel of 400)
units
- - - - - - 12.8 x 7.5 x 9mm Surface Mount Solder - 9mm - 12.8mm 7.5mm
RS stock no. 210-6469
Mfr. Part No.A262CAN
BrandOEP
R 110.50
Each
units
- - - - - - 29 x 24 x 23mm - - 16g 23mm - 29mm 24mm
RS stock no. 122-9165
Mfr. Part No.SM-LP-5001E
BrandBourns
R 31.565
Each (In a Pack of 2)
units
600Ω - 115Ω - - 115Ω 12.8 x 7.5 x 9mm Surface Mount Solder - 9mm - 12.8mm 7.5mm
RS stock no. 667-5962
Mfr. Part No.CN006
BrandOEP
R 215.34
Each
units
- - - - - - 34.7 x 15.5 x 28.2mm - - - 28.2mm - 34.7mm 15.5mm
RS stock no. 106-8576
Mfr. Part No.DA101MC
R 22.636
Each (In a Tube of 50)
units
- - - - - - 9.52 x 9 x 6.35mm Surface Mount - 0.9g 6.35mm - 9.52mm 9mm
RS stock no. 800-4347
Mfr. Part No.DA101MC
R 24.81
Each
units
- - - - - - 9.52 x 9 x 6.35mm Surface Mount - 0.9g 6.35mm - 9.52mm 9mm
RS stock no. 123-7234
Mfr. Part No.Z30A18C
BrandOEP
R 506.27
Each
units
150 Ω, 600 Ω 150 Ω, 600 Ω 36.4Ω - - 44.4Ω 36 x 30 x 16mm Through Hole PC Pin 57g 16mm - 36mm 30mm
RS stock no. 123-7240
Mfr. Part No.D29A09F
BrandOEP
R 727.49
Each
units
6.6kΩ 3.75 Ω, 7.5 Ω, 15 Ω 294.7Ω 10W - 682mΩ 76.8 x 64 x 64mm Panel Mount Solder 860g 64mm - 76.8mm 64mm
RS stock no. 123-7200
Mfr. Part No.A187A12C
BrandOEP
R 519.29
Each
units
600Ω 600Ω 49.8Ω - - 48.5Ω 29.4 x 25 x 24.2mm Through Hole PC Pin 56g 24.2mm - 29.4mm 25mm