| 摘要 |
PURPOSE:To transfer smoothly a mode, to prevent the imposibility of discrimination and to reduce the damages of apparatus by switching stepwise the resistance values of an integration circuit in accordance with outputs of respective modes and comparing the outputs of the integrating circuit with reference voltage. CONSTITUTION:Resistors 3a-3n, 4, 5 constitute the voltage dividing circuit of a DC power supply 13 and also consitute an integrating circuit together with a capacitor 6. Transistors (TRs) 2a-2n are controlled on and off in accordance with digital signal mode outputs applied to input terminals 1a-1n and the voltage dividing ratio of the voltage dividing circuit is changed in accordance with the controlled status of the TRs 2a-2n. The output terminal of the integration circuit, i.e. one end of the capacitor 6, is connected to one end of resistors 7a-7n. The other end of the each of resistors 7a-7n is connected to the base of one of TRs constituting each comparators 8a-8n. Prescribed reference voltages are applied to the bases of the other TRs of the comparators through resistors 10a-10n, respectively. |
