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. 210-6475
Mfr. Part No.N35A002F
BrandOEP
£14.29
Each
Units
4 → 15kΩ 3 → 15Ω 1012Ω 3.5W 40mA 1.5Ω 74 x 41.5 x 36mm Chassis Mount - 250g 36mm - 74mm 41.5mm
RS Stock No. 123-7237
Mfr. Part No.V78A01F
BrandOEP
£44.44
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. 123-7240
Mfr. Part No.D29A09F
BrandOEP
£29.92
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. 210-6532
Mfr. Part No.D29A100
BrandOEP
£18.62
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. 210-6469
Mfr. Part No.A262CAN
BrandOEP
£4.33
Each
Units
- - - - - - 29 x 24 x 23mm - - 16g 23mm - 29mm 24mm
RS Stock No. 667-5962
Mfr. Part No.CN006
BrandOEP
£10.35
Each
Units
- - - - - - 34.7 x 15.5 x 28.2mm - - - 28.2mm - 34.7mm 15.5mm
RS Stock No. 210-6526
Mfr. Part No.N35A001F
BrandOEP
£13.90
Each
Units
- 37Ω 10W - 0.5Ω 88 x 50 x 44mm Chassis Mount - 400g 44mm - 88mm 50mm
RS Stock No. 210-6352
Mfr. Part No.X187B
BrandOEP
£38.49
Each
Units
600Ω 50kΩ 30.9Ω - - 1520Ω 34 (Dia.) x 31mm Chassis Mount Termination Wire 100g 31mm 34mm - -
RS Stock No. 210-6447
Mfr. Part No.A262A7E
BrandOEP
£10.69
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. 123-7204
Mfr. Part No.A187A16C/1
BrandOEP
£25.20
Each
Units
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. 123-7200
Mfr. Part No.A187A12C
BrandOEP
£20.84
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. 123-7242
Mfr. Part No.R35A03F/4
BrandOEP
£28.70
Each
Units
5kΩ 8 Ω, 16 Ω 365Ω 3W - 900mΩ 87.3 x 52 x 49.5mm Panel Mount Solder 465g 49.5mm - 87.3mm 52mm
RS Stock No. 210-6481
Mfr. Part No.TF021
BrandOEP
£8.74
Each
Units
- 0.39Ω 2W - 0.47Ω 65 x 40 x 37mm Chassis Mount - 130g 37mm - 65mm 40mm
RS Stock No. 123-7241
Mfr. Part No.R35A03F
BrandOEP
£28.19
Each
Units
5kΩ 4 Ω, 8 Ω 320Ω 12W - 750mΩ 87.3 x 52 x 49.5mm Panel Mount Solder 465g 49.5mm - 87.3mm 52mm
RS Stock No. 210-6497
Mfr. Part No.B18A001F
BrandOEP
£9.26
Each
Units
- 320Ω 2W 500mA 0.7Ω 44.5 x 36 x 32.9mm Chassis Mount - 190g 32.9mm - 44.5mm 36mm
RS Stock No. 123-7198
Mfr. Part No.A187A10C
BrandOEP
£20.84
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. 123-7234
Mfr. Part No.Z30A18C
BrandOEP
£25.20
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. 851-3686
Mfr. Part No.Z1604
BrandOEP
£7.20
Each
Units
600Ω 600Ω 109Ω 2mW - 134Ω 18 x 12.6 x 18mm Through Hole PC Pin - 18mm - 18mm 12.6mm
RS Stock No. 210-6419
Mfr. Part No.A262A2E
BrandOEP
£11.20
Each
Units
150Ω 600Ω 10.3Ω 100mW Hz @ 300, 1mW Hz @ 30 - 59.5Ω 27.94 x 22 x 22.9mm Through Hole Pin - 22.9mm - 27.94mm 22mm
RS Stock No. 123-7239
Mfr. Part No.CUI30A04E
BrandOEP
£18.89
Each
Units
150 (Parallel) Ω, 600 (Series) Ω 150 (Parallel) Ω, 600 (Series) Ω 9 + 9Ω 2W - 11.4 + 11.4Ω 53.4 x 44.4 x 22.5mm Through Hole PC Pin 185g 22.5mm - 53.4mm 44.4mm
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