Two stage direct-coupled transistor amplifier utilizing d. c. positive feedback and d. c.-a. c. negative feedback

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  机译： A．测量电路，该电路具有带反馈路径的放大器，同步开关输出在其中驱动a d。 C。仪表

• 4. A. c. servosystem with d. c. damping feedback to magnetic amplifier [P] . 美国专利： US2961590A . 1960-11-22

  机译： A． d。伺服系统C。阻尼反馈到磁放大器

• 5. Positive-feedback d. c. motor speed control circuits [P] . 美国专利： US3134065A . 1964-05-19

  机译： 正反馈d。 C。电动机速度控制电路

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