drive device

Abstract

Abstract PURPOSE:To decrease the number of output lines of digital circuit part, and also to simplify the circuit by connecting a load of a series circuit and a connecting part of a driving circuit, and a load of other series circuit and a conecting part of a current limiting resistance, through a diode in each separate series circuit. CONSTITUTION:Loads 5, 6 display a sound volume operation, and for instance, when a key switch of a large sound volume of a key input part 17 is operated, outputs A, B and C of a microcomputer 1 become ''0'', ''1'' and ''0'', and as soon as the display use load 6 is driven, a magnetic tape sound recording and reproducing device 21 which has received signals of ''0'', ''1'' and ''0'' makes a sound volumne large gradually. When a necessary sound volume is obtained, an operator stops operating the key switch. As a result, the outputs A, B and C all become ''0'', and as soon as the load 6 comes not to be driven, a sound volume variation of the device 21 stops, as well. The case when the sound volume is small is all the same. Also, as for the sound recording operation, there is such a danger as the contents of a sound-recorded tape are erased by mistake, therefore, in case when said operation has been executed, it is displayed as a load 7 or informed by using a load of a sounding function.

Inventors

• 👤 Yuji Deguchi
• 👤 出口　裕司

Bibliographic Details