| 摘要 |
PURPOSE:To obtain a switching circuit which can be easily designed without having a microcomputer as the main constituent, by changing two pictures by means of the timing pulse of a general IC, three CR time constant holding circuit and a monostable multivibrator. CONSTITUTION:The down counter 28A is connected through the data control circuit 26A to the electronic channel selection equipment 21A for receiving a command signal from the keyboard 22A of the remote control transmitter side. Not only the down counter 28A but also the second CR time constant holding circuit 34 are operated by the output of the first CR time constant holding circuit 31 which is operated by the output of the picture change-over switch 29. The down counter 28A is preset by operating the first monostable multivibrator 35 by the output of the circuit 34, and also the initial condition of channel selection position is input to the electronic channel selection equipment by operating the second monostable multivibrator 36. On the other hand, the astable multivibrator 39A is driven by a oscillation control signal of the down counter 28A. |
