All You Would Want To Know About Audio Transformers - Miracle Electronics

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All You Would Want To Know About Audio
Transformers Miracle Electronics
A transformer is an electrical device that allows
an AC input signal to produce an AC output
signal without the input and output being
physically connected. This device works with two
or more coils of insulated wire, called windings,
wound around a magnetic metal core. When an AC
signal passes through the primary winding, which
is the input, a related AC signal appears on the
secondary winding, which is the output. This
entire procedure is known as inductive coupling.
Transformers can be manufactured with multiple
primary and secondary windings, each with
multiple connections or taps that offer different
impedances. Transformers with various impedance
ratios can be manufacturing by altering
the number of wire turns in each winding. As the
signal passes through the transformer, the ratio
between the input and output impedances provides
a gain or loss of signal level. Since
transformers are bi-directional in nature, they
can provide a gain in signal level when used in
one direction, and a loss in signal level when
used in reverse.
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With a wide variety of transformers available, we
will only focus on audio transformers, their
usage, their types, and more in this blog. Audio
transformers are those that are designed for
usage in amplifiers and high frequency
audio/video circuits for coupling and impedance
matching applications. There are two main types
of audio transformers step-up/step-down
transformers, and unity 11 transformers. Step-u
p / Step-down transformers Step-up and step-down
transformers have different number of windings in
the primary and secondary, thus leading to
different impedances that ultimately cause the
signal level to change. If the secondary has more
windings as compared to the primary, the
impedance will be higher and the signal level
will be at a higher voltage too. Transformers
with multiple taps provide access to multiple
impedances and different signal losses/gains. The
two main functions of step- up/step-down
transformers are signal level compatibility or
matching, and impedance compatibility or
matching. Unity 11 transformers Unity 11
transformers have the same number of windings on
each coil, which means identical impedance for
both primary and secondary, therefore leading to
no change in the signal level. Such transformers
allow an audio signal to pass unaltered from the
primary to secondary while blocking DC voltage
and radio frequency interference. The quality of
unity 11 transformers electrically isolating
different pieces of equipment, results in solving
noise issues. The main functions that unity 11
transformers perform include DC blocking, radio
frequency interference blocking, ground lift,
and device isolation. What are the benefits of
audio transformers? After reading the blog above,
you are well-versed with all the benefits that
audio transformers provide. However, to sum it
up, here is the list. Audio transformers can
increase or decrease a signal voltage, increase
or decrease the circuit impedance, convert
circuits between balanced and unbalanced, block
DC current while allowing AC to flow, and
electrically isolating one device from another.
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• What are the limitations of audio transformers?
• Even though audio transformers provide such
  amazing benefits, they also come with a lot of
  limitations, some of which are stated below.
• Audio transformers can only pass audio signals,
  meaning that they reduce or block signals below
  and above the audio range of 20 to 20,000 Hz.
• Audio transformers have maximum input level that
  cant be exceeded without causing distorted
  signals, meaning that when the maximum level is
  exceeded, they cant hold any more signals.
• Audio transformers cant step up signals by more
  than 25 dB when used in audio circuits thus
  requiring an active pre-amplifier for a gain of
  more than 25 dB.
• Consequently, you can use audio transformers to
  match impedances, increase/decrease signal
  levels by up to 25 dB, and isolate problem
  components within an audio chain. However, when
  you need to increase a signal level by more than
  25 dB, audio transformers are inappropriate
  solutions. Miracle Electronics is a leading
  transformer manufacturer in India, whose audio
  transformers can help you hear better with no
  disturbance in your auditory pleasure because the
  impedance of loudspeakers can be matched to the
  optimum load of the tube or transistor with
  these transformers.

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