Audio Transformers

Part Number	Description / PDF	Quantity
SP-52-B Triad Magnetics	TRANSER 1.5K CT/ 600 OHM AUDIO	0
SP-69-B Triad Magnetics	TRANS 600/ 600CT 150 SPLIT AUDIO	672
TY-301P-B Triad Magnetics	TRANSF 900 OHM SEC. 0MA DC TEL	1239
TY-304P-B Triad Magnetics	TRANSF 600 CT OHM 0MA DC TEL	0
MET-60-T Triad Magnetics	TRANSFORMER 135:135CT 10.0MADC	742
TY-400P Triad Magnetics	TRANSF 600 OHM 90MA DC TEL	78546084
TY-306P Triad Magnetics	TRANSF 600 SPLIT PRI .75MA DC TE	730
SP-128 Triad Magnetics	INDUCTOR AUDIO 0.1 HENRY	305
SP-52 Triad Magnetics	TRANSER 1.5K CT/ 600 OHM AUDIO	304252
TY-300P Triad Magnetics	TRANSF 600 OHM 0MA DC TEL HYBRID	7581234
SP-32 Triad Magnetics	AUDIO TRANSFORMER	45
TY-311P-B Triad Magnetics	TRANSF 600 OHM 0MA DC TEL	4800
SP-20-B Triad Magnetics	TRANSF 10K CT/1.2K CT AUDIO	0
MET-09-T-B Triad Magnetics	TRANSFORMER 10KCT:10KCT 1.0MADC	5644
SP-33-B Triad Magnetics	TRANS 1K/50 OHM IMPEDANCE AUDIO	0
MET-39-T Triad Magnetics	TRANSFORMER 500:50 3.0MADC	1146
SP-42-B Triad Magnetics	TRANSER 150 CT/ 12 OHM AUDIO	0
MET-22-T Triad Magnetics	TRANSFORMR 2.5KCT:2.5KCT 1.0MADC	29
SP-22-B Triad Magnetics	TRANSF 10K/2KCT 500 SPLIT SEC AU	0
SP-68-B Triad Magnetics	TRANS 10K/10KCT 2.5K SPLIT AUDIO	0

Audio Transformers

1. Overview

Audio Transformers are electromagnetic devices that transfer electrical energy between two or more circuits through electromagnetic induction. They play a critical role in audio systems by enabling impedance matching, signal isolation, voltage/current conversion, and noise suppression. These components are essential in maintaining signal integrity and optimizing performance across audio frequency ranges (typically 20Hz-20kHz). Their importance spans professional audio equipment, consumer electronics, and industrial systems.

2. Main Types and Functional Classification

Type	Functional Features	Application Examples
Input Transformers	High impedance matching, balanced-to-unbalanced conversion	Mixer consoles, microphone preamps
Output Transformers	Voltage step-down, load impedance adaptation	Power amplifiers, speaker systems
Isolation Transformers	Galvanic separation, ground loop elimination	DI boxes, audio interfaces
Phase Splitter Transformers	Signal phase inversion with equal amplitude	Push-pull amplifier circuits

3. Structure and Components

Typical audio transformers consist of: - **Core Materials**: Laminated silicon steel (for low-frequency response) or ferrite (for high-frequency applications) - **Windings**: Primary and secondary coils with precise turn ratios, often using enamel-coated copper wire - **Insulation**: Dielectric barriers between windings for safety isolation - **Enclosure**: Metal or plastic housing for electromagnetic shielding and mechanical protection

4. Key Technical Specifications

Parameter	Description	Importance
Frequency Response	Range: 10Hz-100kHz (typical audio bandwidth)	Ensures full-spectrum audio reproduction
Turns Ratio	Voltage ratio: 1:1 to 1:20 (varies by application)	Determines impedance matching capability
Impedance	Primary/secondary values: 50 -10k	Matches source/load impedances for maximum power transfer
Power Handling	1W-1kW rating depending on size	Prevents saturation in high-power applications
THD (Total Harmonic Distortion)	Typical <0.1% at 1kHz	Maintains signal fidelity

5. Application Fields

Major industries include: - **Professional Audio**: Concert sound systems, studio recording equipment - **Consumer Electronics**: Home theater systems, headphone amplifiers - **Broadcast**: Transmitters, mixing consoles - **Industrial**: Public address systems, test and measurement devices - **Musical Instruments**: Guitar amplifiers, DI boxes

6. Leading Manufacturers and Products

Manufacturer	Key Products	Specifications
Cinemag	Vintage-Style Output Transformers	300Hz-20kHz response, 500V isolation
Triad Magnetics	SP-6388 Input Transformer	600 :600 ratio, 2W power rating
Stancor	P-1118 Isolation Transformer	1:1 ratio, 1500V dielectric withstand

7. Selection Guide

Key considerations: - Match impedance ratios to source/load requirements - Verify frequency response aligns with application bandwidth - Calculate power handling needs with 20% safety margin - Prioritize low THD (<0.05%) for critical audio paths - Consider physical size constraints and cooling requirements - Example: Selecting a 1:10 step-up transformer for moving-coil phono cartridges requires 20Hz-50kHz frequency response and 5mW power handling.

8. Industry Trends

Current developments include: - Miniaturization through advanced core materials (nanocrystalline alloys) - Integration with digital signal processing (hybrid analog-digital designs) - Improved efficiency via planar transformer technology - Increased adoption of surface-mount (SMD) packages for automated manufacturing - Enhanced EMC performance for wireless audio systems