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. 123-7207
Mfr. Part No.A262A8E
BrandOEP
€13.81
Each
units
2.5 kΩ, 10 kΩ 2.5 kΩ, 10 kΩ 424Ω 100mW - 464Ω 27.94 x 22.9 x 22.2mm Through Hole PC Pin 40g 22.2mm - 27.94mm 22.9mm
RS Stock No. 210-6352
Mfr. Part No.X187B
BrandOEP
€52.98
Each
units
600Ω 50kΩ 30.9Ω - - 1520Ω 34 (Dia.) x 31mm Chassis Mount Termination Wire 100g 31mm 34mm - -
RS Stock No. 123-7214
Mfr. Part No.J30A09C
BrandOEP
€39.80
Each
units
600Ω 1.5 + 1.5 + 1.5kΩ 83Ω - - 89Ω 36 x 30 x 25mm Through Hole PC Pin 110g 25mm - 36mm 30mm
RS Stock No. 123-7203
Mfr. Part No.A187A15C
BrandOEP
€35.34
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. 123-7200
Mfr. Part No.A187A12C
BrandOEP
€23.55
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
RS Stock No. 210-6374
Mfr. Part No.E187B
BrandOEP
€6.18
Each
units
3kΩ 250 Ω, 500 Ω 80Ω 5mW - 46Ω 27 x 20 x 21mm PCB Mount - - 21mm - 27mm 20mm
RS Stock No. 210-6481
Mfr. Part No.TF021
BrandOEP
€9.88
Each
units
- 0.39Ω 2W - 0.47Ω 65 x 40 x 37mm Chassis Mount - 130g 37mm - 65mm 40mm
RS Stock No. 106-8577
Mfr. Part No.DA103C
€1.25
Each (In a Tube of 50)
units
- - - - - - 9 x 6.35 x 10.16mm Through Hole - - 10.16mm - 9mm 6.35mm
RS Stock No. 106-8579
Mfr. Part No.DA102C
€1.268
Each (In a Tube of 50)
units
- - - - - - 9 x 6.35 x 10.16mm Through Hole - - 10.16mm - 9mm 6.35mm
RS Stock No. 715-6917
Mfr. Part No.DA102C
€1.32
Each
units
- - - - - - 9 x 6.35 x 10.16mm Through Hole - - 10.16mm - 9mm 6.35mm
RS Stock No. 715-6911
Mfr. Part No.DA103C
€1.31
Each
units
- - - - - - 9 x 6.35 x 10.16mm Through Hole - - 10.16mm - 9mm 6.35mm
RS Stock No. 210-6447
Mfr. Part No.A262A7E
BrandOEP
€12.08
Each
units
600Ω 600Ω 42Ω 100mW Hz @ 300, 1mW Hz @ 30, 2.5mW Hz @ 50 - 58Ω 28 x 22 x 23.2mm Through Hole Pin - 23.2mm - 28mm 22mm
RS Stock No. 123-7209
Mfr. Part No.A262A45E/1
BrandOEP
€13.81
Each
units
200 Ω, 800 Ω 5 kΩ, 20 kΩ 24Ω 100mW - 1.076Ω 27.94 x 22.9 x 22.2mm Through Hole PC Pin 40g 22.2mm - 27.94mm 22.9mm
RS Stock No. 123-7208
Mfr. Part No.A262A41E
BrandOEP
€13.81
Each
units
1 kΩ, 4 kΩ 1 kΩ, 4 kΩ 132Ω 100mW - 190Ω 27.94 x 22.9 x 22.2mm Through Hole PC Pin 40g 22.2mm - 27.94mm 22.9mm
RS Stock No. 210-6368
Mfr. Part No.E187A
BrandOEP
€10.25
Each
units
800Ω 800Ω 63Ω - - 84Ω 20.5 x 17 x 16mm Through Hole - - 16mm - 20.5mm 17mm
RS Stock No. 123-7221
Mfr. Part No.Z1673E
BrandOEP
€6.90
Each
units
50Ω 600Ω 10.3Ω 2mW - 150Ω 18 x 18 x 15mm Through Hole PC Pin 14g 15mm - 18mm 18mm
RS Stock No. 667-6066
Mfr. Part No.Z218A3C
BrandOEP
€13.81
Each
units
1.8 kΩ, 600 Ω - 47Ω - - 1.34 kΩ, 1.46 kΩ 25.2 x 17.8 x 19mm Through Hole - - 19mm - 25.2mm 17.8mm
RS Stock No. 667-6076
Mfr. Part No.Z218A2E
BrandOEP
€12.60
Each
units
600Ω - 60Ω - - 165Ω 21.5 x 16.3 x 18mm Through Hole - - 18mm - 21.5mm 16.3mm
RS Stock No. 667-5969
Mfr. Part No.Z3003E
BrandOEP
€16.32
Each
units
2.5 kΩ, 10 kΩ 10kΩ 2.1kΩ - - 2.2kΩ 32 x 15 x 27mm Through Hole - - 27mm - 32mm 15mm
RS Stock No. 800-4338
Mfr. Part No.DA102MC
€1.39
Each
units
- - - - - - 9.52 x 9 x 6.35mm Surface Mount - 0.9g 6.35mm - 9.52mm 9mm
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