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楼主 |
发表于 2018-1-8 17:05
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本帖最后由 magicbox4me 于 2018-1-8 17:12 编辑
This constant 2 amp current is fed to Q1. Resistor R8 and potentiometer P1 form a DC feedback loop which operates the gate of Q1 at about 4 volts and places the Drain potential of Q2 at the midway point of the power supply, or about 17 volts. Input signal passes through C6 and R5 to the gate of Q1, and output signal passes through C3 and C4 in parallel to the loudspeaker. R9 and R2 are there to bleed off DC, but are not particularly essential. Z1 is essential to insure that an input transient cannot exceed the 20 V gate rating of the Mosfet.
这种恒定的2安培电流被馈到Q1。电阻R8和电位器P1组成直流反馈回路由Q1的栅极在4伏的电源和地的中间点,Q2的漏极电位,或约17伏特。输入信号通过C6和R5到Q1的栅极,输出信号通过并联的C3和C4的扬声器。R9和R2有直流,但不是特别重要。Z1是确保MOSFET的栅极输入瞬态不能超过20 V ,这至关重要。
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