Hifi headphone amplifier circuit
An amplifier with low impedance drive means of headphones built using discrete components.
Output at 0.25W into 50 ohms and 1W into 8 ohms
input control with 100K pot
The two halves of the circuit are identical. Both entries have a continuous 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 adapt the center of the damping of the input signal to prevent signals on the left and right. If the balance control on the left side is moved, the entrance to the left lane with less resistance than the right lane and the left channel by more than the right side and vice versa. The 10k above resitors ensure that neither input can be shorted “to earth. Shall be sent to The gain of the audio signal from a single stage of the procedure and a common emitter amplifier direct coupled emitter follower. Overall, receiving less than 10, but the final emitter follower directly drive 8 ohm headphones. Higher headphones work equally well. Note the final 2k2 resistor at each exit. This removes the potential for continuous 2200U coupling capacitors and prevents punch “is heard when headphones are plugged in. The bias circuit itself Designed to operate with a power supply 6 to 20 volts DC.
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