Today's theme is a remote-controlled dual-mode receiver. We transform the receiver into a dual-mode, receive the mid-nine live star signal and receive the normal DVB signal at the same time. The KC1 controls the audio and video to select one output, and the KC2 controls the nine-machine power supply. The KC2 uses a 12V single-pole relay, and the mid-nine machine does not work. In this state, the dual-mode function can be realized.
The dual-mode receiver can receive both the Nine-Nine Live Star signal and the normal DVB signal. Simply press the F4 button on the remote control to switch between the two modes. It is very convenient to use.
The test equipment is Sidako's ordinary medium-sized machine and medium-sized sapphire free machine (hereinafter referred to as the middle six machine). The free machine adopts the Qileda chip, which cuts off the power supply of the feeder in the standby state. This feature can be used for this. Control the opening and closing of the nine-machine, so as to achieve the purpose of "dual mode", the principle is shown in the following figure. In the figure, KC1 and KC2 are relays, KC1 controls the audio and video to select one output, and KC2 controls the nine-machine power supply. VD and R form a voltage stabilizing circuit, which regulates the polarization voltage of the feeder line by 13V/18V and supplies it to the relay. The principle is to control the audio and video output by using the feeder voltage of the sixth machine.
The circuit board is soldered. Although the four-power splitter is used on the board, only two ports are actually used, and the voltage supply relay is obtained from the feeder of the middle six machine. The regulator component uses a 12V Zener diode and a 600 divider resistor. The relay KC1 adopts a 12V double-pole double-throw small relay, two normally closed contacts are connected to the mid-ninth AV terminal, the normally open contact is connected to the middle six-machine AV terminal, and the common terminal is connected to the AV output socket. The KC2 uses a 12V single-pole relay with a contact voltage of 220V, in series with the mid-nine machine power supply. The outdoor antenna connection only requires that the Zhongjiu live star machine be connected to the position of the four-cut one port 1, and the ports 2 to 4 are connected to other satellites. The feeders are respectively connected to the antenna jacks of the machine via the power splitters.
After connecting the line, turn on the power switch of the middle six machine and the middle nine machine. At this time, the middle six machine is working, and the middle nine machine does not work. In this state, the dual mode function can be realized.
When pressing the "standby" button on the remote control of the middle six machine, the middle six machine enters the standby state (the display of the digital display is OFF), the feeder voltage disappears, the relay contact is reset, the middle nine line is connected, and the middle nine machine is working. Nine mode to watch the live star program (pictured). When the "standby" button of the middle six machine is pressed again, when the middle six machine is woken up, the relay is energized, the middle nine line is disconnected, and the DVB free program is entered in the middle six mode. This is the DIY dual-mode machine, the "standby" button is the toggle button. When you finish watching, just turn off the power of both machines.
In this way, DIY's dual-mode machine has the biggest advantage of not changing any circuit in the machine, retaining all the functions of the machine, but switching at the "cost" of standby, not from the perspective of energy saving and low carbon. Very scientific, if you make a little improvement, using the standby signal of the machine chip to achieve the two-machine interlock, this is the real dual-mode machine.
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