Headphone Amplifier by IC TDA2004

A opamp. medium power, here it?s used as amplifier of headphones with possibility drive low loads. It contains in a nutshell two amplifiers. The voltage gain, has been determined in 40dB, from the R3-4 and R11-12, for each channel, respectively. The restriction of bandwidth for each unit is regulated by the combination of R12, C2 and R13, C15, in 22KHZ. The R5, R10 attend to the adaptation of impedance earphones. The resistors R6 and R9 discharge the capacitors C9 and C12, in order that when we connect the headphones in the plug, not we have annoying noise. The circuit has very good characteristics as low distortion, noise and satisfactory frequency response. The requirement of circuit in current is 150mA, roughly, with voltage supply + 15V. The IC1 should be placed on a suitable heatsink.

Part List

R1=120Kohm	R6-9=1.2Kohm	C6-15=3.3nF 100V MKT
R2-13=330 ohm	R7-8=1.2 ohm	C7-8-13-14=100uF 1V
R3-12=2.2Kohm	C1-4-5=10uF 16V	C9-12=470uF 25V
R4-11=27 ohm	C2=100uF 25V	IC1= TDA2004 in Heatsink
R5-10=22 ohm	C3-10-11=100nF 100V MKT

Source :: http://users.otenet.gr/~athsam/
headphone_amplifier_with_tda2004.htm

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