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For example, you designed a power supply for a specific load. Let say the load is 10k. You can verify your design by just simply terminating the power supply output with 10kOhm resistor. In microwave circuits, if you do not terminate the output with match load resistor i.
You will have all your waves reflect back making standing waves in the transmissions lines. Besides microwaves circuits, in communication termination is used to ensure recessive bit transmission. It also prevents reflections that might cause communication failure as a result of ringing on the bit edges.
Resistor plays a key roll in gain control of many circuits. In the design of common collector CE , the gain is directly proportional to the value of collector resistor value.
The larger the resistor value the larger the gain, but you cannot increase its value to certain limits. I will keep updating it as I learn new things about the resistors. Feel free to comment if you have any question. You can also add more value to it by sharing your knowledge in the comment section. Share it with other people to help them as well, and see you in the next post. I am very happy to see you.
In this blog, I share my learnings about electronics, microwaves circuits design, and together we have an awesome time. Hopefully, it will be helpful to you and you will enjoy it. Hi, hope you are having a good life. In this post, I am going to share with you my knowledge…. Hay there! Looking to learn some basic electronics for beginners. Then, this article will help you and guide you.
You use a mobile phone, laptop, and other awesome electronics gadgets almost…. Hope you are having a good time. In this post, I share my learning about the regulated power supply…. Previously we looked at key terminologies used in electronics. In this article we will introduce ourselves to the concept of …. Hey there, looking for a voltage divider design?
So at one point in the circle, you have the panel, and electricity will flow out from the panel and then back to the panel. You can think of a sensor as a switch, like a door and window contact, for instance. When it's closed, the electricity will still flow through the loop, through the sensor, and back to the panel. When it's open, then the electricity will only flow to that sensor and not make it back to the panel.
And you can have two different configurations, either a normally closed zone or a normally open zone. On normally closed zones, the alarm triggers when the flow of electricity is stopped. And this is the most commonly used. It's used for things like door and window contacts, motion sensors, glass break detectors, etc. We generally recommend using one sensor per zone, but you can use multiple sensors by wiring them in series.
And whether you have one or ten, it will work the same way. When all the sensors are closed, then the loop is complete and the electricity will flow through the sensors and back to the panel. When any one of the sensors on a zone is opened, then the electricity will flow to that sensor, but not past it. And in this case, triggering an alarm.
A normally open zone is the complete opposite. So the alarm is actually triggered when the current completes the loop, not when it's stopped. This is very commonly used for smoke detectors, but it can also be used in other specialized instances. And it's pretty common to wire more than one smoke detector together into a zone. To do this, you'll actually wire in parallel instead of series.
So when all of them are open, then the flow of electricity does not make it back to the panel. But if any one of those is closed, then the flow of electricity will flow to that sensor and then back to the panel. And thus causing an alarm. So what are resistors? A resistor is just a device that impedes the flow of electricity without stopping it. There's different ratings of resistors, and even each panel will require a differently rated resistor.
In this video, we're going to be using DSC's rating which is 5. So what our resistor's going to do is actually supervise the wiring. So you would be able to tell, for instance, if you have a short in your wiring. This will most commonly protect you against installation errors.
Maybe you accidentally shorted a wire at the panel, because you cut off too much insulation. Or maybe you're hanging a picture and you put a screw or a nail through the wire and shorted it out.
But it will also potentially prevent someone from tampering with your wire and shorting it on purpose. This is especially true if you have exposed wires. The resistors need to go at the end of the line because they will only supervise the wiring from the resistor to the panel.
So if you put the resistor at the panel, it's, again, only going to supervise the wiring between the resistor and the panel, which is now wiring.
That's why you need to put them at the end of the line and why they're called end of line resistors. Putting them at the panel is going to do nothing for you. So let's look at a normally closed zone, just a simple one sensor zone with no resistor. So when it's closed, the panel's going to, again, send out electricity, it's going to go through that zone and back to the panel.
And it'll see zero ohms of resistance. When it's opened then the electricity is going to stop at the sensor and not make it back to the panel. This is equivalent of seeing an infinite resistance or infinite ohms. If it's shorted, then the electricity will actually travel to the short, and then back to the panel, and the system will see zero ohms. This is a case whether the sensor is open or closed because the electricity isn't even traveling to the sensor.
So without a resistor, when the sensor's closed, it will see zero ohms. And when it's shorted, it sees zero ohms. You can't tell the difference. Now if we put a resistor in series at that sensor when it's closed, the electricity will flow through the loop again, but it will also travel through the resistor, and the panel will see that resistance of 5.
When it's open, again, it will show infinite ohms because the electricity is not making it back to the panel. Now if there's a short anywhere along the wiring, it'll travel to that short and then back to the panel. It won't travel to the resistor, and so it will show zero ohms of resistance. Now the panel can tell the difference between that short of zero ohms and a normally closed state, which is 5. Now on a normally open zone, we'll actually put the resistor in parallel.
So it's a little bit different. So if the sensor's in its normal state of open, then the electricity will actually travel through that resistor and back to the panel because it won't be able to travel through the sensor, but it can go through the resistor. So when the sensor's open, the panel will actually see 5. Now if the sensor closes, the electricity's going to take the path of least resistance. It will travel up through the wire and then through the sensor because there is less resistance going through the sensor than going through the resistor and back to the panel.
And so it will show zero ohms when it's closed. Now on a normally open zone, if the wire is cut is the only time that you should see infinite ohms on the panel. So let's go to the table now and look at a few of these examples. So we've got three different examples here.
Here the time taken to charge or discharge a capacitor constitutes the basic time pulse or trigger for the circuit. A resistor is effectively used to control this charging and discharging process and its value is varied to obtain different time intervals. Surge Protection: The initial switch ON of a power supply may at times inflict a dangerous voltage surge into an electronic circuit, damaging its critical components.
A resistor when introduced in series with the supply terminals of the circuit helps in checking the sudden rise in voltage and averting possible harm. These resistors are generally of low values so that the overall performance of the circuit is not affected. The above basic examples must have provided you sufficient knowledge regarding the use of resistors in electronic circuits and helped you to understand what is the function of a resistor.
For further information, feel free to add your comments comments need moderation and may take time to appear. Q1: How many types of resistors are there based on the type of materials used?
A: There are many kinds of resistors based on the type of material used to make the resistor: 1. Wirewound WW Resistors 2. Metal Film Resistors 3. Metal Oxide Film Resistors 4. Foil Resistors 5. Carbon Film Resistors. Q2: What is the color coding of resistors?
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