NE5534 based 9 Volt Headphone Amplifier circuit

While doing research for Designing an Opamp headphone amplifier circuits portable, I built a portable headphone amplifier for testing purposes. EACH channel uses a single Burr-Brown Op-Amp NE5534 in a inverting configuration. It has adequate current capability to drive most headphones without an output stage. I have Used it with Sennheiser 465s and achieved ear-splitting volume. The amplifier is ideal as a booster for power-conserving stereo sources Such as portable CD players and for interfacing with passive EQ networks Such as tone controls or a headphone acoustic simulator.

The schematic for one channel of the amplifier is shown in figure below

Rangkaian 9 Volt Headphone Amplifier NE5534

List Component:

P1         : 22K  Dual gang Log Potentiometer
R1,R5      : 18K  1/4W Resistors
R2,R3,R4,R6: 68K  1/4W Resistors
C1,C2,C6   : 4µ7/25V Electrolytic Capacitors
C3,C7      : 22pF Ceramic Capacitors
C4,C5,C8   : 220µF/25V Electrolytic Capacitors
IC1        : NE5532  Dual Op-amp
J1         : 3.5mm  Stereo Jack Socket
SW1        : SPST  Slide or toggle switch
B1         : 9 Volt  PP3 battery

NE5532 Pinning

The NE5532 is a very convenient package of two 5534s in one 8-pin devices with internal unity-gain compensation, as there are no spare pins. The 5534/2 is a low-distortion, low-noise device, having also the ability to drive low-impedance loads to a full voltage swing while maintaining low distortion. Furthermore, it is fully output short-circuit proof. Therefore, this circuit was implemented with a single NE5532 chip forming a pair of stereo, inverting amplifiers, having an ac gain of about 3.5 and capable of delivering up to 3.6V peak-to-peak into a 32 Ohm load (corresponding to 50mW RMS) at less than 0.025% total harmonic distortion (1kHz & 10kHz).