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. 172-8670
Mfr. Part No.SM-LP-5001E
BrandBourns
€1.184
Each (On a Reel of 400)
units
- - - - - - 12.8 x 7.5 x 9mm Surface Mount Solder - 9mm - 12.8mm 7.5mm
RS Stock No. 123-7242
Mfr. Part No.R35A03F/4
BrandOEP
€32.43
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. 667-6048
Mfr. Part No.Z21806C
BrandOEP
€23.23
Each
units
270Ω 300Ω 270Ω - - 300Ω 25 x 18.5 x 19.3mm Through Hole - 45g 19.3mm - 25mm 18.5mm
RS Stock No. 667-6038
Mfr. Part No.Z21807E
BrandOEP
€14.20
Each
units
10 → 20kΩ - 1.8kΩ - - 0.715 kΩ, 1.1 kΩ 21.5 x 16.3 x 18mm Through Hole - - 18mm - 21.5mm 16.3mm
RS Stock No. 123-7240
Mfr. Part No.D29A09F
BrandOEP
€33.81
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. 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. 123-7235
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. 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. 168-3326
Mfr. Part No.749196507
€9.71
Each
units
- - 36mΩ - 2.3A - 21.5 x 21 x 12mm Surface Mount Solder - 12mm - 21.5mm 21mm
RS Stock No. 123-7210
Mfr. Part No.A262A47E
BrandOEP
€13.81
Each
units
150 Ω, 600 Ω 2.5 kΩ, 10 kΩ 20.6Ω 100mW - 474Ω 27.94 x 22.9 x 22.2mm Through Hole PC Pin 40g 22.2mm - 27.94mm 22.9mm
RS Stock No. 210-6431
Mfr. Part No.A262A6E
BrandOEP
€11.96
Each
units
150Ω 150Ω 15Ω 1mW Hz @ 30, 100mW Hz @ 300 - 20Ω 28 x 22 x 23mm Through Hole Pin - 23mm - 28mm 22mm
RS Stock No. 851-3686
Mfr. Part No.Z1604
BrandOEP
€7.84
Each
units
600Ω 600Ω 109Ω 2mW - 134Ω 18 x 12.6 x 18mm Through Hole PC Pin - 18mm - 18mm 12.6mm
RS Stock No. 667-6088
Mfr. Part No.Z218A6E
BrandOEP
€11.00
Each
units
600Ω - 46Ω - - 60Ω 21.5 x 16.3 x 18mm Through Hole - - 18mm - 21.5mm 16.3mm
RS Stock No. 123-7219
Mfr. Part No.Z1671E
BrandOEP
€6.90
Each
units
50Ω 100Ω 10.3Ω 2mW - 21.4Ω 18 x 18 x 15mm Through Hole PC Pin 14g 15mm - 18mm 18mm
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. 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. 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. 123-7206
Mfr. Part No.A187A18C
BrandOEP
€24.62
Each
units
200Ω 5kΩ 13.5Ω - - 352Ω 29.4 x 25 x 24.2mm Through Hole PC Pin 56g 24.2mm - 29.4mm 25mm
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. 168-3111
Mfr. Part No.749196218
€5.172
Each (On a Reel of 400)
units
- - 200mΩ - 800mA - 16.3 x 12 x 7.4mm Surface Mount Solder - 7.4mm - 16.3mm 12mm