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
€12.60
Each
units
600Ω - 171Ω - - 234Ω 21.5 x 16.3 x 18mm Through Hole - - 18mm - 21.5mm 16.3mm
RS Stock No. 123-7232
Mfr. Part No.Z1688E
BrandOEP
€6.90
Each
units
600Ω 2.4kΩ 117Ω 2mW - 425Ω 18 x 18 x 15mm Through Hole PC Pin 14g 15mm - 18mm 18mm
RS Stock No. 168-3218
Mfr. Part No.749196228
€3.59
Each
units
- - 200mΩ - 800mA - 16.3 x 12 x 7.4mm Surface Mount Solder - 7.4mm - 16.3mm 12mm
RS Stock No. 667-6032
Mfr. Part No.Z21808E
BrandOEP
€10.67
Each
units
150Ω - 45Ω - - 1.5kΩ 21.5 x 16.3 x 18mm Through Hole - - 18mm - 21.5mm 16.3mm
RS Stock No. 168-3109
Mfr. Part No.749196148
€4.409
Each (On a Reel of 500)
units
- - 344mΩ - 500mA - 12.9 x 9.2 x 6.2mm Surface Mount Solder - 6.2mm - 12.9mm 9.2mm
RS Stock No. 168-3246
Mfr. Part No.749010310
€5.91
Each
units
- - - - - - 12.7 x 8.67 x 4mm Surface Mount Solder - 4mm - 12.7mm 8.67mm
RS Stock No. 123-7199
Mfr. Part No.A187A11C
BrandOEP
€23.55
Each
units
577Ω 1 + 1kΩ 49.8Ω - - 48.5 (Secondary 1) Ω, 50 (Secondary 2) Ω 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
€20.94
Each
units
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. 667-6044
Mfr. Part No.Z21805C
BrandOEP
€28.25
Each
units
500Ω 1kΩ 37Ω - - 172Ω 25 x 19.3 x 18.5mm Surface Mount - 28g 18.5mm - 25mm 19.3mm
RS Stock No. 123-7233
Mfr. Part No.Z30A11C
BrandOEP
€36.96
Each
units
150 Ω, 600 Ω 2.4 kΩ, 600 Ω 15 (Primary 1) Ω, 15 (Primary 2) Ω - - 74.2 (Secondary 1 and 2)Ω 36 x 30 x 16mm Through Hole PC Pin 57g 16mm - 36mm 30mm
RS Stock No. 210-6504
Mfr. Part No.P74A001F
BrandOEP
€13.77
Each
units
- 79Ω 5W - 1.3Ω 81.5 x 45.5 x 39mm Chassis Mount - 350g 39mm - 81.5mm 45.5mm
RS Stock No. 123-7216
Mfr. Part No.J30A14C
BrandOEP
€46.10
Each
units
200 Ω, 800 Ω 10 kΩ, 39 kΩ 118Ω - - 1.384kΩ 36 x 30 x 25mm Through Hole PC Pin 110g 25mm - 36mm 30mm
RS Stock No. 123-7226
Mfr. Part No.Z1680E
BrandOEP
€6.90
Each
units
150Ω 150Ω 29.5Ω 2mW - 37.4Ω 18 x 18 x 15mm Through Hole PC Pin 14g 15mm - 18mm 18mm
RS Stock No. 168-3124
Mfr. Part No.749196517
€7.841
Each (On a Reel of 120)
units
- - 36mΩ - 2.3A - 21.5 x 21 x 12mm Surface Mount Solder - 12mm - 21.5mm 21mm
RS Stock No. 168-3329
Mfr. Part No.749196528
€9.62
Each
units
- - 102mΩ - 1.35A - 21.5 x 21 x 12mm Surface Mount Solder - 12mm - 21.5mm 21mm
RS Stock No. 123-7218
Mfr. Part No.Z1670E
BrandOEP
€6.90
Each
units
50Ω 50Ω 10.3Ω 2mW - 13.3Ω 18 x 18 x 15mm Through Hole PC Pin 14g 15mm - 18mm 18mm
RS Stock No. 174-0620
Mfr. Part No.LM-NP-1001-B1L
BrandBourns
€1.94
Each
units
- - - - - - - - - - - - - -
RS Stock No. 123-7231
Mfr. Part No.Z1687E
BrandOEP
€6.90
Each
units
600Ω 1.2kΩ 117Ω 2mW - 262Ω 18 x 18 x 15mm Through Hole PC Pin 14g 15mm - 18mm 18mm
RS Stock No. 123-7204
Mfr. Part No.A187A16C/1
BrandOEP
€28.48
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. 123-7202
Mfr. Part No.A187A14C
BrandOEP
€24.79
Each
units
150 Ω, 600 Ω 10kΩ 38Ω - - 1.085kΩ 29.4 x 25 x 24.2mm Through Hole PC Pin 56g 24.2mm - 29.4mm 25mm