headphone amplifier

Posted on Feb 5, 2014

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

headphone amplifier
Click here to download the full size of the above Circuit.

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. 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.

Leave Comment

characters left:

Related Circuits

  • New Circuits



    Popular Circuits

    Telephone motor Controller
    Door Chime with ATtiny12
    Phase Shifter
    70Mhz Rf Power Amplifier Circuit
    touch alarm system
    free energy generator from a candle
    Door lock Motor
    Communication between a USB/serial device and an AVR (atmega/Arduino) microcontroller
    Blinker Indicator
    Voltage Regulator Calculation
    A combination of common-source grounded base amplifier formed by cascaded amplifier
    ECM microphone preamplifier