Through Hole Audio Transformer 1 + 1kΩ

  • RS Stock No. 123-7199
  • Mfr. Part No. A187A11C
  • Brand OEP
Technical Reference
Legislation and Compliance
RoHS Certificate of Compliance
COO (Country of Origin): GB
Product Details

OEP A187A11C Microphone Transformers

A187A11C microphone transformers from OEP are ideal for signal splitting and impedance matching. These audio transformers provide two isolated balance outputs when loaded with 1 kΩ. Constructed with multiple electrostatic screens, these dual output microphone transformers have excellent common mode rejection. They are encapsulated in a mumetal screening can.

Proof voltage of 250 Vrms from windings to screen and from primary to secondaries
2.85 H nominal inductance at 1 kHz, 0.1 V
Interwinding capacitance of 180 pF at 1 kHz for primary to screens
Interwinding capacitance of 71 pF for secondary 1 to screens
Interwinding capacitance of 113 pF for secondary 2 to screens


Do not pass DC through the windings

Attribute Value
Primary Impedance 577Ω
Secondary Impedance 1 + 1kΩ
Primary DC Resistance 49.8Ω
Secondary DC Resistance 48.5 (Secondary 1) Ω, 50 (Secondary 2) Ω
Dimensions 29.4 x 25 x 24.2mm
Mounting Type Through Hole
Termination Type PC Pin
Weight 56g
Depth 24.2mm
Length 29.4mm
Width 25mm
Construction Enclosed
Turns Ratio 1:1:1
Minimum Operating Frequency 15Hz
Core Type Laminated
Minimum Temperature 0°C
Maximum Temperature +70°C
Isolation Voltage 250V
Maximum Operating Frequency 50kHz
13 In stock - FREE next working day delivery available
Price Each
£ 26.86
(exc. VAT)
£ 32.23
(inc. VAT)
Per unit
1 - 9
10 +
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