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. 123-7227
Mfr. Part No.Z1681E
BrandOEP
$16.83
Each
units
150Ω 300Ω 29.5Ω 2mW - 52.2Ω 18 x 18 x 15mm Through Hole PC Pin 14g 15mm - 18mm 18mm
RS Stock No. 168-3229
Mfr. Part No.749196238
$14.02
Each
units
- - 200mΩ - 800mA - 16.3 x 12 x 7.4mm Surface Mount Solder - 7.4mm - 16.3mm 12mm
RS Stock No. 168-3114
Mfr. Part No.749196248
$9.34
Each (On a Reel of 400)
units
- - 200mΩ - 800mA - 16.3 x 12 x 7.4mm Surface Mount Solder - 7.4mm - 16.3mm 12mm
RS Stock No. 210-6380
Mfr. Part No.R/Z1606
BrandOEP
$19.60
Each
units
800Ω 800Ω 109Ω 2mW - 134Ω 18 x 12.7 x 18mm Through Hole - - 18mm - 18mm 12.7mm
RS Stock No. 667-6088
Mfr. Part No.Z218A6E
BrandOEP
$21.42
Each
units
600Ω - 46Ω - - 60Ω 21.5 x 16.3 x 18mm Through Hole - - 18mm - 21.5mm 16.3mm
RS Stock No. 123-7231
Mfr. Part No.Z1687E
BrandOEP
$16.83
Each
units
600Ω 1.2kΩ 117Ω 2mW - 262Ω 18 x 18 x 15mm Through Hole PC Pin 14g 15mm - 18mm 18mm
RS Stock No. 123-7217
Mfr. Part No.K30A06C
BrandOEP
$91.78
Each
units
2.4 kΩ, 10 kΩ 10kΩ 450 (Primary 1) Ω, 590 (Primary 2) Ω - - 1.04kΩ 36 x 30 x 25mm Through Hole PC Pin 110g 25mm - 36mm 30mm
RS Stock No. 168-3108
Mfr. Part No.749196138
$8.90
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. 168-3115
Mfr. Part No.749196308
$10.15
Each (On a Reel of 300)
units
- - 145mΩ - 830mA - 17.5 x 16 x 9mm Surface Mount Solder - 9mm - 17.5mm 16mm
RS Stock No. 168-3124
Mfr. Part No.749196517
$14.19
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. 123-7232
Mfr. Part No.Z1688E
BrandOEP
$16.83
Each
units
600Ω 2.4kΩ 117Ω 2mW - 425Ω 18 x 18 x 15mm Through Hole PC Pin 14g 15mm - 18mm 18mm
RS Stock No. 667-6050
Mfr. Part No.Z21808C
BrandOEP
$40.07
Each
units
150Ω - 45Ω - - 1.5kΩ 25 x 18.5 x 19.3mm Through Hole - - 19.3mm - 25mm 18.5mm
RS Stock No. 168-3301
Mfr. Part No.749196338
$13.84
Each
units
- - 145mΩ - 830mA - 17.5 x 16 x 9mm Surface Mount Solder - 9mm - 17.5mm 16mm
RS Stock No. 168-3122
Mfr. Part No.749196508
$14.19
Each (On a Reel of 120)
units
- - 102mΩ - 1.35A - 21.5 x 21 x 12mm Surface Mount Solder - 12mm - 21.5mm 21mm
RS Stock No. 168-3313
Mfr. Part No.749196348
$13.84
Each
units
- - 145mΩ - 830mA - 17.5 x 16 x 9mm Surface Mount Solder - 9mm - 17.5mm 16mm
RS Stock No. 123-7230
Mfr. Part No.Z1686E
BrandOEP
$16.83
Each
units
600Ω 900Ω 117Ω 2mW - 180Ω 18 x 18 x 15mm Through Hole PC Pin 14g 15mm - 18mm 18mm
RS Stock No. 168-3232
Mfr. Part No.749196548
$17.73
Each
units
- - 102mΩ - 1.35A - 21.5 x 21 x 12mm Surface Mount Solder - 12mm - 21.5mm 21mm
RS Stock No. 168-3109
Mfr. Part No.749196148
$8.90
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. 168-3325
Mfr. Part No.749196148
$13.35
Each
units
- - 344mΩ - 500mA - 12.9 x 9.2 x 6.2mm Surface Mount Solder - 6.2mm - 12.9mm 9.2mm
RS Stock No. 168-3127
Mfr. Part No.749196528
$14.19
Each (On a Reel of 120)
units
- - 102mΩ - 1.35A - 21.5 x 21 x 12mm Surface Mount Solder - 12mm - 21.5mm 21mm
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