Headphone Audio Amplifier with Balance Control


Posted on Feb 7, 2014

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


Headphone Audio Amplifier with Balance Control
Click here to download the full size of the above Circuit.

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 earlier 10k resitors be definite 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:

New Circuits

.

 


Popular Circuits

AVR LCD Microcontrolled Oscilloscope
Rms-to-dc converter
Solar Powered High Efficiency Charger
RFI-Free Ringer Generator Works Off Single 5-V Supply
rf digital
Reflex Action Game
Capacitor Meter Circuit
5hz to 500 Khz Frequency-Meter
Two-LED Voltage Indicator
Tilt Sensor via Accelerometer Circuit
Packard Bell Remote Control
555 Audio guide blind electronic circuit diagram



Top