Hello everyone, welcome to the ZimZimDIY channel. Today I will talk about how to discharge a capacitor. Which methods can be used? I will divide it into 3 main methods that many people like to use. Let's start with C that has a low charge storage value and can withstand low voltage, such as these Cs. If the voltage withstand rate of C, I think it is not more than 10V. Most of the time, we can use this method to discharge. Method 1 is to discharge. By shorting both terminals together like this, which is considered an easy and convenient method because it can use a metal device or a conductor, such as a small flathead screwdriver, to hook together. Do it for 2 to 3 rounds, and it will be able to discharge completely. For example, this C has a value of 1,000 uF 16V. I will charge it to 5V. After that, I will try shorting its legs. You will hear it discharge softly like this. I will charge it again but use 10V instead. You will hear a soft shorting sound. But this time, I will change to C 3800uF 35V using the same charging voltage at 10V. Now, friends, notice that in addition to the popping sound, there are also small sparks. Therefore, the electric current that comes out depends on the charge storage of C. Try again. This one has a higher charge storage value. It will cause a more severe short. I'm not satisfied yet. I will charge the voltage to the maximum of 31V and then short-circuit the legs again using a flat screwdriver. Here is the voltage of 31V. In addition to the sound and sparks, it also shocked me. My hand lifted and shook a little. In addition, if you use a screwdriver brace, it can also cause arc marks on the handle. There are spots. I immediately thought of a lithium battery spot welding pen. I don't know if anyone has ever done this DIY before. But importantly, the sparks that come in can be dangerous to the eyes. This method, someone compared it to us. It's like we have a spring that is pulled and stretched to the limit. Then you release it quickly. Therefore, it will bounce back violently. Therefore, Method 1 is not suitable for C with a high charge value. Because it can be dangerous to the operator and the plate inside the C. So let's look at Method 2. In Method 2, we will use a resistor to discharge. The resistance value depends on the use. But I will use about 150 ohms or more. But if the value is too high, it will take a long time to discharge. And must use R that can withstand the wattage. A little high, such as this type of R tile. You can see that C 3800uF that was pressurized at 31V a moment ago, when it meets my 150ohm R tile, almost nothing happens. But it has already discharged. Try measuring the remaining voltage. Here, there is still about 1V left. Get rid of it by shorting both legs together. With this method, you can DIY by inserting R in series with the LED to check the status of the light. If there is still light, it means that the charge has not been discharged. The formula for calculating the resistance value is in this clip. I will put the link in the upper right corner here. This method is considered much safer. It is like we slowly hold a tight spring, let it shrink and let it relax slowly. But anyway, to be sure, you should short its legs again. Because there is still a small residual voltage. Go to Method 3. We will use a 100W incandescent light bulb to discharge. This method is popular among technicians with a high voltage C of 300V or more. There will be a target plug and then connect the wire to clamp it. Or it can be like this. This is C 450V 100uF with terminals. Connected in a rectified manner with a diode bridge as an experimental set to simulate a large amount of residual voltage at C. I will plug it in and measure the voltage for you to see. Here, the voltage is about 333V. I will unplug it. Notice that there is still a residual voltage of more than 300 volts. Therefore, I will discharge by jumping both legs to the incandescent light bulb. The discharge is complete. If you leave the plug plugged in, the light will be on. But if we discharge, the light will flash for a moment and then disappear. After that, to be sure, short both legs together again. C will be discharged completely. Asked if the second method can be used, it can be used, but you have to change the LED resistor. I will use a value of about 100Kohm, but the R of the tile is still the same number, 150ohm. It can be used as well. I will present this much for now. Thank you to all friends who have followed and watched. #Method of discharging #Discharging Capacitor #Discharge