Table of Contents:
The switch ‘SW’ is connected for testing in such a way that it can close and open the contact with the ground and PIN C of the BOARD_A. The PIN B should be connected with the PIN D so that the INDICATOR module can get positive voltage.
Suppose when the power is applied and the SW is open, the INDICATOR module should have the red LED glowing only and we can find the video and sound from the DTH set top box on the TV. When I toggle the switch I can hear the clicking sound from the RELAY module and the yellow LED in the INDICATOR modules glows only. Now the sound and video from the DVD- player on the TV is found.
If the BOARD_A initiates we can say that it is working perfectly as we have expected.
Now let us build the BOARD_B and test it with the BOARD_A. The BOARD_B should have the connectors for IR_RECEIVER, COMPARATOR, MONOSTABLE and REGULATOR modules. It should also include circuits for relay driving and IR indication. We have built the BOARD_B which has all the mentioned things and the image of the same is shown below.
Figure: BOARD_B top plane view
Now we can plug in the modules to their corresponding female connectors in the BOARD_B. The fully assembled BOARD_B with all the modules is shown in the following image.
Figure: fully assembled BOARD_B