How to Check the Correct Diode
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How to Check the Correct Diode – Among the various types of diodes currently available, the Zener diode, also known as the 4148 diode, functions to stabilize the voltage on the power supply or
Where these electronic components have certain codes, basically all types of diodes have the same manufacturing material, namely in the form of semiconductors.
How to Check the Correct Diode
In summary, there are at least some characteristics of the 4148 diode that are commonly found in various electronic circuit applications, namely:
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There are many types of diodes. However, there are several types that are very commonly used in electronic circuits, such as LEDs and rectifier diodes.
On the other hand, if a negative voltage is applied to the anode and a positive voltage is applied to the cathode, a bias is called reverse bias.
When a rectifier diode is biased, the minimum applied voltage is 0.7 V for silicon and 0.3 V for germanium.
Where the voltage drop on the diode is 0.7V or 0.3V depending on the type of material. For example, a rectifier diode is forward biased 10v, then the output becomes 10-0, 7=9, 3v.
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As a diode, type 1N4001 can withstand a maximum reverse voltage of 100V, and type 1N4007 can withstand a reverse voltage of up to 1000V.
For example, diodes 1N4001 – 1N4007 have a power limit of 1A, and diodes 1N5401 have a power limit of 3A.
A zener diode is a diode that has the characteristics of conducting an electric current that flows in the opposite direction if the applied voltage exceeds the breakdown voltage or “zener voltage”.
Only when the zener diode is installed in reverse bias, current will flow if the voltage exceeds the value of the zener breakdown voltage.
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If the current is greater than 20mA, the LED can be damaged, so a resistor is installed in the LED circuit as a current limiter.
Photodiode is a diode that works based on light intensity, if the photodiode is exposed to light, the photodiode generally works as a diode, but if it does not receive light, the photodiode will work as a resistor with a high resistance value. . so that the electric current does not flow.
The light that can be detected by this photodiode ranges from infrared light, visible light, ultraviolet light to X-rays.
The working principle, because the photodiode is made of a p-n junction semiconductor, the light absorbed by the photodiode will result in the displacement of photons which can produce electron-hole pairs on both sides of the junction.
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When the generated electrons enter the conductive beads, the electrons will flow to the positive voltage source, while the resulting holes will flow to the negative voltage source, so current will flow in the circuit.
The function is also the same, which is to regulate the bias voltage, but the Schottky diode has no voltage drop and can work at high frequencies.
Uses Schottky diodes are used in high-speed switching circuits and in radio frequency (RF) circuits, rectifier circuits, mixing circuits.
Because the zener diode has characteristics that are quite different from ordinary diodes, the way this component works also has differences, as follows:
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Basically, when the applied voltage in the opposite direction (reverse bias) exceeds the “breakdown voltage” limit, the zener diode will transmit an electric current, i.e. the voltage will enter the next circuit.
If the zener diode is installed using a reverse biased circuit, then the semiconductor component will transmit a voltage with a stable value related to the value of the zener voltage.
To understand how Zener diodes work, you will see them in two circuit states, namely when they are connected in parallel and in series with an enter voltage. Please provide the following explanation:
Where the output voltage (Vout) will be the same as the zener diode voltage, for example you use a 5V6 series zener diode, then the measured output voltage will be 5.6V.
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To see if this principle is valid or not, you can then try changing the value of the enter voltage relative to the diagram above, such as increasing it to 12V and then trying to lower it again to 8V.
If the output voltage remains stable at 5.6V even though the enter voltage varies, the diode will work fine.
Based on the principle of operation, it is known that the zener diode can be used as a voltage stabilizer and limiting voltage level in an electronic circuit.
This principle will allow it to act as a microcontroller port protector against sudden voltage spikes entering the port which could potentially damage the IC.
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To observe more elements of the operation of the zener diode in this series circuit, try changing the value of the input voltage, for example increasing it to 12V and lowering it to 8V.
If the zener diode is in good condition, the output voltage (Vout) will also change up and down depending on the input voltage (Vin).
In terms of its working principle, you can use a zener diode to detect the voltage level at a point in an electronic circuit.
As with other components, the zener diode value can be read by looking at the code label on the physical component.
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There are many ways to read this code and there is no standard because each manufacturer has their own way of writing it.
There are only a few common writing formats. As well as writing the operating voltage in the 5V6 number format which indicates if the zener diode stabilizes the output voltage at a value of 5.6 VDC.
But there are also manufacturers who write their own code, for example the zener diode code 1NXXXX, for this code need knowledge of the zener voltage of each code, here is a list:
In addition to the code 1NXXXX above, there is another zener diode manufacturer code, which is the MA type zener diode default code.
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The first number in this code indicates the capacity of the diode component, for example MA1xxx = 1 W, MA2xxx = 0.5 W, MA3xxx = 0.3 W, MA4xxx = 1/4 W and MA5xxx = 1/8 W.
Then the last 3 numbers are information related to the operating voltage of the diode, for example MA 3100 which means a zener voltage of 10.0v, MA 2180 has an operating voltage of 18.0v, MA 3056 has a zener voltage of 5.6v, MA 3091 has a voltage of 9.1v and so on.
Where, how to measure a zener diode is the same as how to measure other rectifiers commonly used in circuits.
But there is something to remember, when measurements are made with a voltmeter or multimeter, the needle still shows the presence of voltage, even though the terminal has a reverse polarity, it can be determined whether the diode being measured is worn or leaking.
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One of the easiest ways to measure a Zener diode is to use the Ohmmeter function on your multimeter.
This measurement method can also find out whether the zener diode is still in good condition or there is a quick or open problem.
To perform the test, you can first construct a simple circuit by placing a resistor in series with the Zener diode to be measured.
The 1N4148 diode can handle a maximum current of 2A. It has a recovery time of 8ns with very fast switching times when it is forward biased.
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The main function of the 1N4148 diode is as a switch or gate that can only pass electric current in one direction.
These diodes have a high resistance under a fixed voltage whereas a diode with a low resistance above a fixed voltage.
The use of these diodes can be made based on the maximum recovery time and power loss which is between 80 milliwatts and 1 kilowatt.
Its use is mainly in fast change operations. The operation of this diode can be done in two ways, namely bias and reverse bias.
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For this circuit, the LED is used as the load. In bias mode, the IN4148 diode acts as a closed switch, allowing current to flow through the LED so it will light up.
Similarly, in reverse bias mode, this diode acts as a closed switch so that there is no current in all the LEDs, so they will die.
When using these diodes in electronic circuit projects, be sure to install the diode terminals or pins correctly and do not reverse them. Because this can cause the circuit does not work regularly.
The positive terminal or cathode of the diode is marked with a black circular band on one side of the diode body.
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Also, be sure to place the diodes in the circuit according to their specifications and characteristics to avoid damaging the diodes.
Its application mainly includes single isolated power supply for high frequency signal circuit, industrial control circuit, computer board, communication, television, etc. Home AC DC Current Basic Electricity Rectifying Diodes Educational Electrical Equipment Electrical Equipment Electrical Theory Electrical Ideas & Tricks Electric Guide
Hello, provide seekers, I hope you are always protected, this time on my blog I will explain how to measure a diode bridge or what is called maintaining rock steel hehe cyprok my boss.
First, a little speech or introduction, because it’s a thousand words hehe. Generally, this diode bridge is used in Mitsubishi motors, batteries, cranes and so on, okay, come on, boss.
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A diode bridge is a diode bridge, contains 4 diodes connected per arm, the diode bridge acts as a rectifier (DC current) or converts AC current into DC. Diode bridges generally have limited capabilities based on the read-on-write code on the diode bridge itself, for example in the image below:
In the picture above is an example of a diode bridge or cypress code, 25 indicates the limiting ampacity of the diode, which is 25 amps, and 10 is the voltage, which is 1000 volts as far as I know. The + sign is direct current, and next to it is the alternating current symbol. How to measure a diode or cyproc bridge, see the reviews below:
How do you measure a diode bridge?! It’s not difficult if you can use a multitester, read how to use a multitester.
In the picture above is how to measure the diode bridge with the sign (+) on the red wire of the multitester and the sign (-) on the black wire of the probe, adjust the selector for the multitester with an ohm scale, if everything in the picture above is complete, see the indicator needle on the multitester , if moving means good (diode bridge is not broken). Then come back
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