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Headphone Amplifier Using
Discrete Components

Category: Audio, Headphone Amplifiers

An amplifier to drive low to medium
impedance headphones built using discrete components.

Both halves
of the circuit are identical. Both inputs have a dc path to ground via the input
47k control which should be a dual log type potentiometer. The balance control
is a single 47k linear potentiometer, which at center adjustment prevents even
attenuation to both left and right input signals.

If the balance control
is moved towards the left side, the left input track has less resistance than
the right track and the left channel is reduced more than the right side and
vice versa. The preceding 10k resitors ensure that neither input can be
"shorted" to earth.

Circuit diagram:

Headphone Amplifier Circuit
Diagram

Amplification of the audio signal is provided by a
single stage common emitter amplifier and then via a direct coupled emitter
follower. Overall gain is less than 10 but the final emitter follower stage will
directly drive 8 ohm headphones. Higher impedance headphones will work equally
well.

Note the final 2k2 resistor at each output. This removes the dc
potential from the 2200u coupling capacitors and prevents any "thump" being
heard when headphones are plugged in. The circuit is self biasing and designed
to work with any power supply from 6 to 20 Volts DC.

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