12W Audio Amplifier based MOSFET 2SK135 / 2SJ50

This is a small 12W audio amplifier over a load of 8 Ω, that combining the NE5534 integrated with a pair of V-MOSFET transistor output stage technology as we get excellent sound performance. MOSFET 2SK135 / 2SJ50 from Hitachi is used in this circuit. Input sensitivity of the circuit is 3V RMS maximum, the distortion factor is 0.002% at 1 kHz, and the frequency response is 15 Hz to 100 kHz. (-3dB).

This circuit requires a symmetrical (dual polarity) power supply with voltage output +/- 25V and the current output should be 2A maximum.

12W Audio Amplifier Components List:

R1 = 33 kΩC1 = 1nF 63VD1 = 1N967B zener 18V 0.5WR2 = 6.8 kΩC2 = 47 µF 40VD2 = 1N967B zener 18V 0.5WR3 = 22 kΩC3 = 100 nF 63VD3 = 1N4148R4 = 100 kΩC4 = 100 nF 63VD4 = 1N4148R5 = 1 kΩC5 = 47 µF 40VQ1 = 2SK135 MOSFETR6 = 330 ΩC6 = 4.7 pF ceramicQ2 = 2SJ50 MOSFETR7 = 1 kΩC7 = 100 µF 40VIC1 = NE5534R8 = 10 kΩC8 = 100 µF 40VR9 = 0.47 Ω 2WR10 = 0.47 Ω 2WR11 = 10 kΩ

Power Supply Specification:
Voltage: Symmetrical 25V
Current : 1A – 2A Max

MOSFET 2SK135 and 2SJ50 Datasheet Downloads:
SK133, SK134, SK135 Datasheet 192.12 KBDownload
2SJ48, 2SJ49, 2SJ50 Datasheet 193.15 KBDownload

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