| 摘要 |
PURPOSE:To simplify a circuit constitution by superimposing a signal for controlling an audible means on the signal of the output port of a control circuit for controlling a visible means. CONSTITUTION:The 11 pins of a microcomputer go to H according to the input of a ringer signal to turn on a transistor 37 and a light emitting diode 36 lights. Since when the 11 pins go to H once, they maintain the state, the light emitting diode 36 continues to be light. Thereafter, the control pulse of a BEEP sound for starting a recording is issued from the 11 pins, it is amplified in a power amplifier 24 since the 11 pins maintain H and there is no fluctuation, and it is guided to a speaker 34. Thus, the visible means and the audible means are controlled by the same port of the microcomputer. Thereby, the constitution of the circuit can be simplified.
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