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. 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
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. 210-6497
Mfr. Part No.B18A001F
BrandOEP
€10.46
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. 210-6403
Mfr. Part No.A262A1E
BrandOEP
€12.67
Each
units
150Ω 3.75Ω 10.3Ω - - 0.37Ω 27.94 x 22 x 22.9mm Through Hole - - 22.9mm - 27.94mm 22mm
RS Stock No. 123-7238
Mfr. Part No.CUI30A02E
BrandOEP
€21.35
Each
units
70 (Parallel) Ω, 280 (Series) Ω 2.4 (Series) kΩ, 600 (Parallel) Ω 3.13 + 3.13Ω 2W - 20.8 + 20.8Ω 53.4 x 44.4 x 22.5mm Through Hole PC Pin 185g 22.5mm - 53.4mm 44.4mm
RS Stock No. 123-7241
Mfr. Part No.R35A03F
BrandOEP
€31.85
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. 210-6475
Mfr. Part No.N35A002F
BrandOEP
€16.47
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. 123-7229
Mfr. Part No.Z1685E
BrandOEP
€6.90
Each
units
600Ω 600Ω 117Ω 2mW - 151Ω 18 x 18 x 15mm Through Hole PC Pin 14g 15mm - 18mm 18mm
RS Stock No. 210-6419
Mfr. Part No.A262A2E
BrandOEP
€12.91
Each
units
150Ω 600Ω 10.3Ω 1mW Hz @ 30, 100mW Hz @ 300 - 59.5Ω 27.94 x 22 x 22.9mm Through Hole Pin - 22.9mm - 27.94mm 22mm
RS Stock No. 122-9165
Mfr. Part No.SM-LP-5001E
BrandBourns
€1.855
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. 123-7201
Mfr. Part No.A187A13C
BrandOEP
€23.55
Each
units
10kΩ 10kΩ 469 (Primary 1) Ω, 580 (Primary 2) Ω - - 591Ω 29.4 x 25 x 24.2mm Through Hole PC Pin 56g 24.2mm - 29.4mm 25mm
RS Stock No. 715-6914
Mfr. Part No.DA101C
€1.32
Each
units
- - - - - - 9 x 6.35 x 10.16mm Through Hole - - 10.16mm - 9mm 6.35mm
RS Stock No. 123-7211
Mfr. Part No.A262A48E
BrandOEP
€13.81
Each
units
150 Ω, 600 Ω 1.25 kΩ, 5 kΩ 20.6Ω 100mW - 220Ω 27.94 x 22.9 x 22.2mm Through Hole PC Pin 40g 22.2mm - 27.94mm 22.9mm
RS Stock No. 210-6532
Mfr. Part No.D29A100
BrandOEP
€21.04
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
€4.99
Each
units
- - - - - - 29 x 24 x 23mm - - 16g 23mm - 29mm 24mm
RS Stock No. 123-7239
Mfr. Part No.CUI30A04E
BrandOEP
€21.35
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
RS Stock No. 123-7234
Mfr. Part No.Z30A18C
BrandOEP
€28.48
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. 123-7228
Mfr. Part No.Z1682E
BrandOEP
€6.90
Each
units
150Ω 600Ω 29.5Ω 2mW - 150Ω 18 x 18 x 15mm Through Hole PC Pin 14g 15mm - 18mm 18mm
RS Stock No. 210-6425
Mfr. Part No.A262A3E
BrandOEP
€13.51
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. 106-8578
Mfr. Part No.DA101C
€1.268
Each (In a Tube of 50)
units
- - - - - - 9 x 6.35 x 10.16mm Through Hole - - 10.16mm - 9mm 6.35mm