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How to build Headphone Amplifier
October 3, 2010 - category: Audio amplifierCircuit Diagram:
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.
circuit from http://www.redcircuits.com#home3
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