| 摘要 |
<p>PURPOSE:To reduce the size of a momentary switch by facilitating wiring even when the number of loads is large by switching the load in some order in accordance with the operation time of momentary contacts. CONSTITUTION:The outputs of momentary switches 1 and 2 drive a pulse oscillator 4 through an OR gate 3. The output of the momentary switch 1 and that of the pulse oscillator 4 are inputted to the up-count input terminal of an up/ down counter 6 through an AND gate 5', and the output of the momentary switch 2 and that of the oscillator 4 are inputted to the down-count input terminal of the counter 6 through an AND gate 7'. To the output terminals of the counter 6, loads 8'-10' are connected through an OR gate 18 and driving amplifiers 21-23. The outputs of the gates 5' and 7', on the other hand, drive a buzzer BZ27 through an OR gate 24, a monostable multivibrator M.M25, and an amplifier 26.</p> |
