Monday, August 11, 2014

Headphone Amplifier

High Quality unit, No need for a preamplifier So you can simply use this.try this I suppose you will enjoy with this







Parts:

P1 = 22K
R1 = 560R
R2 = 10K
R3 = 10K
R4 = 12K
R5 = 2.2R
R6 = 2.2R
R7 = 22R-1/2W
Q1 = BC337
Q2 = BC327
Q3 = BC337
Q4 = BC327
C1 = 1µF-63V
C2 = 100µF-25V
C3 = 100µF-25V
C4 = 100µF-25V
C5 = 22pF-63V
C6 = 22µF-25V
IC1 = NE5532
J1 = RCA audio input socket




Notes:

* Can be directly connected to CD players, tuners and tape recorders.
* Tested with several headphone models of different impedance: 32, 100, 245, 300, 600 & 2000 Ohm.
* Old 8 Ohm impedance headphones can be also driven, but these obsolete devices are not recommended.
* Schematic shows left channel and power supply (common to both channels).
* Numbers in parentheses show IC1 right channel pin connections.
* A correct grounding is very important to eliminate hum and ground loops. Connect to the same point the ground sides of J1, P1, C2, C3 & C4. Then connect separately the input and output grounds to the power supply ground.
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