The circuit is shown in Figure 9.38.1. It has the function of time display and pre-selection of TV programs , and automatically switches TV channels at a predetermined time. Including the first program to watch first, the device can continuously watch three different channels.
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Program control section
The clock reference is taken from the mains 50HZ signal and sent to IC2 via the resistor. In the IC2 part, the IHZ signal is driven to drive the second and time-sharing counters, and then connected to the corresponding end of the time display IC1 through the lead wires to display the time.
At either end of A~F, the channel can be connected. Press K8 to eliminate the programmed program.
Signal relay is a common device in the automatic control system. It is generally used to connect and disconnect the circuit, issue control commands and reflect the status of the equipment by dropping the card, and remove the signal by returning the signal card after the equipment restores to normal. It is an important part of the automatic control and remote control circuit.
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