Circuit Design

 A person’s inquisitiveness and curiosity can do wonders. It can open a realm of ideas and imaginations never thought before and create something worthwhile.[[wysiwyg_imageupload::]] When I was a child I used to read lot of electronic articles and magazines regularly. I’ve seen a lot of interesting circuits and tried as many of them as possible at that time. Whenever a new circuit catches my attention I can’t resist myself trying it out. Every time I bought a new general purpose PCB and the required components listed with the circuit diagram and spent a lot of time soldering the components in the general purpose board. I used to implement the developed board for its practical purpose but it won’t last too long in its place and eventually end up in my small junk yard. Earlier, I couldn’t afford the cost of all these hardware and now with the passing years I have a large collection of useless circuit boards with costly components soldered into it. 

Up to this point, we were developing the basic functions into specific functional blocks according to their requirements. Let’s take a look at what all functional blocks we have, it will give you an idea how far we advanced in the designing processEach of the blocks shown above can perform their own specified functions only. The entire blocks should perform together to give us a collective output. It will happen only when we connect the blocks together in the proper way. Next we are going to discuss how to connect these blocks together so that we have a complete block diagram for the device. From the entire discussion so far you might already have a picture about the way of connecting these blocks together. The IR light from the TV remote triggers the working of the device and who receives the IR light pulses from the TV remote, the IR photodiode.  

Step: 5) Design circuit for each functional block In this step we will be designing the circuit for individual blocks. The circuits required are simple and very basic circuit known to all; hence it won’t be such a big task. We are not designing anything new, but modifying the well-known basic circuits to suit our…

Step: 8) Find reusable modules from the circuit diagram   Whenever we do hardware designing, the first rule is to make it in modules that can be reusable. The modules that we make for this particular project may come useful in another project and hence reduce the development time for that project. Even if a…

Step: 10) Assemble the modules and test the assembled unit We have built the reusable modules and we have a good idea from the circuit diagram about how their pins should be connected together. At this point we don’t have to worry about the internal circuits of the module and all we need to take…

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…