TRANSMISSION AND RECEPTION CONTROLLING CIRCUIT OF TIME DIVIDING COMMUNICATING WAY

摘要

PURPOSE: A transmission and reception controlling circuit of a time dividing communicating way is provided to decrease noise generated by switching a transmission and reception on/off. CONSTITUTION: The transmission and reception controlling circuit has a first PNP transistor(Q11), a second NPN transistor(Q12), a third PNP transistor(Q13) and a first PNP transistor(Q14). A set supplies control voltage that is repeated a high level and a low level in a certain time interval to a control terminal. A transmitting work is formed if the high level is supplied to the transmission and reception control terminal and a receiving work is formed if the low level is supplied to the transmission and reception control terminal.