Audio Output Transformers – What & Why? – Miracle Electronics

1
An audio transformer is one that works in the
audio range, with a working frequency range
being generally between 10 to 20,000 Hz, and the
impedance often used to transform the voltage or
change the load. These transformer types are
generally used in radios, televisions, voltage
amplifiers, and other such applications.
Construction of an audio transformer The core of
the audio transformer is superimposed by a high
magnetic material, with the primary and
secondary windings tightly coupled, so that the
flux across the original winding almost all has
a phase chain with the secondary winding, and the
coupling coefficient is close to 1. Working of
an audio transformer The lowest frequency of the
passband is determined by the inductance of the
original winding, while the highest frequency is
determined by the leakage inductance of the
transformer. The original winding inductance is
large, and the leakage inductance is small, in
order to ensure that the transformer has
sufficient passband. The saturation of the
magnetic circuit and the hysteresis loss of the
core can cause signal distortion. To counteract
this, there should be proper load distribution
and increased load
2
current. Also, the core section should be
increased, and an air gap left to reduce the
saturation of the magnetic circuit. Doing so can
significantly reduce the distortion of the
signal. Audio output transformer With multiple
types of audio transformers available, what well
focus on in this blog is the audio output
transformer, which is one that is intended to
isolate an input circuit from an output circuit,
while providing filtering to a signal that passes
through it. It is designed to operate on signals
with a frequency spectrum in the audible band.
Output transformers basically perform two
functions completing the matching of output
impedance, and completing the conversion of
voltage to current, so that higher voltage
signal can be converted to an electrical signal
with lower output current. Note Close attention
should be paid to the matching of the front and
back impedance, in order to avoid signal
distortion caused by the reflection. Also, the
impedance of the load must be consistent with the
impedance required by the power amplifier stage,
through the impedance of the output transformer,
in order to maximize the load. Designing an
audio output transformer When youre deciding on
the kind of audio output transformer you want for
your application, the choice of the core
material and its size depends upon the frequency
response, power levels, and harmonic distortion.
Audio output transformers are generally
preferred to use both high-permeability cores and
the largest number of coil turns to create high
primary inductance. Remember, by changing the
number of wire turns in each winding,
transformers can be manufactured to have various
impedance ratios. You can choose to have your
specific customized audio output transformer
India to suit your particular application
requirements at Miracle Electronics, where every
transformer manufactured is of the highest
quality, which is proved by their RoHS and REACH
compliance certificates. So, get in touch
whenever you are looking for the finest quality
audio transformers!