| 摘要 |
PURPOSE:To PLL-control inexpensively without step by doubling a frequency after shaping the waveform of the output of a frequency generator,and triggering a monostable multivibrator by the double frequency. CONSTITUTION:A wavefrom shaper 1 shapes the output of a frequency generator 10, the frequency is doubled by a frequency multiplier 12, and a monostable multivibrator 2 is triggered by the output. A phase comparator 4 compares the output of a reference oscillator 1 with the output of the shaper 1. A multivibrator 5 converts the oscillating frequency of a reference oscillator 11 into a voltage. An addition amplifier 6 adds the outputs of the multivibrators 2, 5 and the comparator 4. A comparator 7 applies a deviation between the output of the amplifier 6 and a reference voltage level to a drive circuit 8 to control the speed of a motor 9. |
