| 摘要 |
PURPOSE:To remarkably reduce the number of terminal pins, by constituting the time constant circuit as the variable time constant circuit, obtaining the output corresponding to the oscillation output different in frequency from the frequency discrimination circuit, performing IC for the oscillator and the frequency discrimination circuit, and externally mounting the time constant circuit. CONSTITUTION:The variable oscillator 25 is provided and the frequencies f1, f2... obtained from the oscillator 25 are fed to the frequency discrimination circuit 5 via the synthesizer 26 as the manual adjusting signal. At that time, the time constant circuit 30 is constituted as the variable type time constant to form the output corresponding to the oscillation output different from the frequenies from the circuit 5. The oscillator 25 and the circuit 5 are integrated for circuit, and the circuit 30 is externally mounted. Thus, the number of terminal pins of the control circuit 4 can remarkably be reduced. |
