Here the 12W MOSFET audio amplifier circuit build based FET component of 2SK135 / 2SJ50. This is a small power amplifier, but capable on delivering very good sound quality. It combines an high quality op-amp IC (NE5534), which has the ability to drive low loads, high speed, low distortion transistor technology with two V-MOSFET in the output.
You can replace the IC1, with another match op-amp IC and increase the voltage/power in the output stage. Please be careful to maintain the power supply voltage of IC1 levels of specification, achieving increased power output. For stereo application, you should build two similar circuit.
Components List
| R1 = 33Kohm R2 = 6.8Kohm R3 = 22Kohm R4 = 100Kohm R5-7 = 1Kohm R6 = 330ohm R8,R11 = 10Kohm R9,R10 = 0.47ohm 2W IC1 = NE5534 | C1 = 1nF/63V C2,C5 = 47uF/40V C3,C4 = 100nF/63V C6 = 4.7pF ceramic C7,C8 = 100uF/40V D1,D2 = 18V 0.5W zener D3,D4 = 1N4148 Q1 = 2SK135 Q2 = 2SJ50 |
Amplifier Specifications:
- Output Power : 12W in 8Ω (max)
- Input sensivity : 3.2V rms (max)
- T.H.D : 0.002% (1KHZ)
- Frequency Response : DC - 100 KHZ (-3dB)
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