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. 667-6082
Mfr. Part No.Z218A7E
BrandOEP
TWD469.00
Each
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600Ω - 171Ω - - 234Ω 21.5 x 16.3 x 18mm Through Hole - - 18mm - 21.5mm 16.3mm
RS Stock No. 123-7204
Mfr. Part No.A187A16C/1
BrandOEP
TWD1,446.00
Each
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30 Ω, 100 Ω 10 kΩ, 49 kΩ 19Ω - - 647Ω 29.4 x 25 x 24.2mm Through Hole PC Pin 56g 24.2mm - 29.4mm 25mm
RS Stock No. 123-7198
Mfr. Part No.A187A10C
BrandOEP
TWD1,252.00
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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. 123-7235
Mfr. Part No.Z30A23C
BrandOEP
TWD1,789.00
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200 Ω, 800 Ω 5kΩ 42 Ω, 45 Ω - - 929Ω 36 x 30 x 16mm Through Hole PC Pin 57g 16mm - 36mm 30mm
RS Stock No. 123-7212
Mfr. Part No.J30A03C
BrandOEP
TWD1,918.00
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150 Ω, 600 Ω 150 Ω, 600 Ω 34.5Ω - - 40.5Ω 36 x 30 x 25mm Through Hole PC Pin 110g 25mm - 36mm 30mm
RS Stock No. 210-6504
Mfr. Part No.P74A001F
BrandOEP
TWD790.00
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- 79Ω 5W - 1.3Ω 81.5 x 45.5 x 39mm Chassis Mount - 350g 39mm - 81.5mm 45.5mm
RS Stock No. 123-7234
Mfr. Part No.Z30A18C
BrandOEP
TWD1,435.00
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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. 800-4338
Mfr. Part No.DA102MC
TWD53.00
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- - - - - - 9.52 x 9 x 6.35mm Surface Mount - 0.9g 6.35mm - 9.52mm 9mm
RS Stock No. 123-7203
Mfr. Part No.A187A15C
BrandOEP
TWD1,802.00
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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. 2508295029
Mfr. Part No.145B
BrandHammond
TWD963.00
Each
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- - - - - - - - - - - - - -
RS Stock No. 2508972739
Mfr. Part No.TY-145P
TWD199.00
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- - - - - - - - - - - - - -
RS Stock No. 2508972672
Mfr. Part No.SP-66
TWD673.00
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- - - - - - - - - - - - - -
RS Stock No. 2508972688
Mfr. Part No.SP-67
TWD727.00
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RS Stock No. 2509220297
Mfr. Part No.SP-310
TWD145.00
Each
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- - - - - - - - - - - - - -
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Mfr. Part No.SP-70
TWD727.00
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