| 摘要 |
PURPOSE:To arbitrarily set the degree of the variation in the discharge amount of an electromagnetic pump for the variation in the voltage of a power source by controlling the energizing time of an electromagnetic coil by a monostable multivibrator in response to the voltage applied to the coil. CONSTITUTION:A rectifier 1 is connected with an AC power source, and a constant-voltage power source 2 is connected with the rectifier 1. An oscillator connecting circuit 3' divides the output voltage of the rectifier 1, and controls the output pulse width of a monostable multivibrator. An oscillator 3 has a free-running multivibrator and a monostable multivibrator. The output of the oscillator 3 is supplied to a switching circuit 4. An electromagnetic coil of an electromagnetic coil is connected between the terminals 4a and 4b of the switching circuit 4. |
