| 摘要 |
PURPOSE: A power amplifier for a sound machinery is provided to offer a stable bias voltage to a MOSFET using a cathode of a tube. CONSTITUTION: A power amplifier for a sound machinery comprises a first amplifier stage(10), a second amplifier stage(20), and an impendence matching line(30). The first amplifier stage comprises a tube(VT1), a first resistance(R1), and a second resistance(R2). The tube is composed of 3 electro tube for the voltage amplification. The second amplifier stage is composed of a third resistance(R3) and a MOSFET. The impendence matching line comprises a transformer(T1) for the impedance matching. |
