Hello everyone, welcome to the ZIMZIM DIY channel. Today, I will talk about an electronic device called a diode. What is a diode? A diode is a type of semiconductor device that is in the thyristor group. But it has only 2 legs and 2 terminals. One terminal is called anode 1 (or A1), and the other terminal is called anode 2 (or A2). The symbol will be like this. If you look at it, it looks like 2 diodes connected upside down, right? Therefore, a diode can conduct current in both directions. That's why it is used with AC power, but it also works with DC power. Current Conduction Condition: A diode will conduct current only when it has a certain breakdown voltage, or in English (Break Over Voltage). So how do you know how much breakdown voltage a given diode requires? We can observe this from itself. Normally, stores that sell electrical equipment Electronics in our country, now, there are only 1-2 numbers for sale, which are DB3 32V and another DB4 40V. But the working range of both of them may be less or more, which is normal. DB3 may be in the range of (28v-36V), DB4 may be in the range of (35v-45v). But don't be careless. There are other shapes of diacs as well. The orange shape with a black head like this is a diac. Or a small blue one is a diac. Or it will be an orange one with a line in the middle, which is also a diac. Let's say that the initial voltage of the diac will conduct a current of about 30V or more. I will do some experiments for you to see. Now I have a 12V switch and 1 step-up. And this will be a lighting circuit, 1 set consisting of 2 red LEDs, dropped with a resistor, and a DB3 diac connected in series with positive power. Observe the voltage. Now the voltage is 26V. Notice that nothing will happen in the circuit. Here I try to adjust the voltage up. From the step-up, adjust it up to 27V, 28V, 29, 30, nothing happens. This is what I adjust to about 34V. The diode will conduct current. And the way to make it stop conducting current is easy. Reduce the voltage. Here, below 30V, it will stop conducting current immediately. Therefore, if it is in the circuit, it will be like this. When the voltage reaches one, it will connect. When the voltage drops one, it will turn off. It is a voltage checker. If we use the same diode and flip it back, switch the legs, notice that it has no effect. The diode can conduct current normally as usual. As long as the breakdown voltage reaches it, it is enough. If you look at the graph of the diode, notice that it can conduct current in both the + and - sides. And it will use a certain voltage value to make the diode conduct current. And the voltage drop across it will fall. And then the current will jump up. In the mA level, most of the use of the diode is not to feed current to the load directly like I am testing now. Because it is fragile, it can only withstand 2 amps of current. But it will be a supporting role more. It will act as a circuit, igniting the triac. When the voltage reaches it, it will tell the diode to work. It will be like this more. Therefore, the next clip will explain the operation of the triac. See you in the next clip. Thank you to all friends who have watched.