| 摘要 |
PURPOSE:To provide the titled circuit with a function for automatically correcting the variation of amplitude by controlling current to be impressed to a driving coil on the basis of a signal outputted from a timer means. CONSTITUTION:The signal impression time T1 of a driving signal 40 is set up and fixed by a monostable multivibrator 8. A detecting signal is a signal detected by a detecting coil 5. The suspending time T2 of the driving signal 40 is the sum of the application time t1, t2 of a bias addition detecting signal 44 and the t2 is set up and fixed by a monostable multivibrator 7. A signal 46 from the vibrator 7 is raised at a point gamma where the inclination alpha of the signal 44 crosses a threshold V1 and the t1 is determined by the inclination alpha. The automatic amplitude correcting function of the circuit maintains the balance between the inclination alpha of the signal and a bias V0 when the size of the inclination is changed in accordance with the change of amplitude.
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