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. 168-3246
Mfr. Part No.749010310
TWD172.00
Each
units
- - - - - - 12.7 x 8.67 x 4mm Surface Mount Solder - 4mm - 12.7mm 8.67mm
RS Stock No. 210-6403
Mfr. Part No.A262A1E
BrandOEP
TWD709.00
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. 123-7206
Mfr. Part No.A187A18C
BrandOEP
TWD1,281.00
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. 123-7199
Mfr. Part No.A187A11C
BrandOEP
TWD1,210.00
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. 667-6076
Mfr. Part No.Z218A2E
BrandOEP
TWD450.00
Each
units
600Ω - 60Ω - - 165Ω 21.5 x 16.3 x 18mm Through Hole - - 18mm - 21.5mm 16.3mm
RS Stock No. 172-8110
Mfr. Part No.LM-NP-1001-B1L
BrandBourns
TWD77.70
Each (In a Bag of 28)
units
- - - - - - 17.7 x 17.7 x 12.6mm Chassis Mount - - 12.6mm - 17.7mm 17.7mm
RS Stock No. 106-8577
Mfr. Part No.DA103C
TWD50.90
Each (In a Tube of 50)
units
- - - - - - 9 x 6.35 x 10.16mm Through Hole - - 10.16mm - 9mm 6.35mm
RS Stock No. 123-7221
Mfr. Part No.Z1673E
BrandOEP
TWD354.00
Each
units
50Ω 600Ω 10.3Ω 2mW - 150Ω 18 x 18 x 15mm Through Hole PC Pin 14g 15mm - 18mm 18mm
RS Stock No. 123-7226
Mfr. Part No.Z1680E
BrandOEP
TWD354.00
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. 123-7241
Mfr. Part No.R35A03F
BrandOEP
TWD1,708.00
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. 168-3326
Mfr. Part No.749196507
TWD393.00
Each
units
- - 36mΩ - 2.3A - 21.5 x 21 x 12mm Surface Mount Solder - 12mm - 21.5mm 21mm
RS Stock No. 667-5950
Mfr. Part No.Z3002E
BrandOEP
TWD875.00
Each
units
10kΩ 10kΩ 2.1kΩ - - 2.2kΩ 32 x 15 x 27mm Through Hole - - 27mm - 32mm 15mm
RS Stock No. 800-4338
Mfr. Part No.DA102MC
TWD53.00
Each
units
- - - - - - 9.52 x 9 x 6.35mm Surface Mount - 0.9g 6.35mm - 9.52mm 9mm
RS Stock No. 123-7233
Mfr. Part No.Z30A11C
BrandOEP
TWD1,435.00
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. 210-6431
Mfr. Part No.A262A6E
BrandOEP
TWD592.00
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. 168-3329
Mfr. Part No.749196528
TWD393.00
Each
units
- - 102mΩ - 1.35A - 21.5 x 21 x 12mm Surface Mount Solder - 12mm - 21.5mm 21mm
RS Stock No. 667-6044
Mfr. Part No.Z21805C
BrandOEP
TWD886.00
Each
units
500Ω 1kΩ 37Ω - - 172Ω 25 x 19.3 x 18.5mm Surface Mount - 28g 18.5mm - 25mm 19.3mm
RS Stock No. 715-6917
Mfr. Part No.DA102C
TWD53.00
Each
units
- - - - - - 9 x 6.35 x 10.16mm Through Hole - - 10.16mm - 9mm 6.35mm
RS Stock No. 210-6532
Mfr. Part No.D29A100
BrandOEP
TWD1,242.00
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. 210-6380
Mfr. Part No.R/Z1606
BrandOEP
TWD332.00
Each
units
800Ω 800Ω 109Ω 2mW - 134Ω 18 x 12.7 x 18mm Through Hole - - 18mm - 18mm 12.7mm