Which is better, PC817 in gear b or gear d (what is the difference between gear D and gear B)

This article will talk about which is better for PC817 and D. Scatter slots online slots online philippines,BAY888.com The world's leading slot game platform, providing exciting gaming experience and generating rewards. Join now and start your journey to victory! Don't forget to collect this site.

List of contents for this article:

• 1、Use Sharp optocoupler pc817 to control the relay. Can B and C gears be interchangeable? What is the difference?_ Baidu...
• 2、How does pc817 know which file it is?

Use Sharp optocoupler pc817 to control the relay. Can B and C gears be interchangeable? What is the difference?_ Baidu...

When using Sharp optocoupler PC817 to control relays, the choice of CTR (current transfer ratio) is crucial. CTR in different gears has different current conversion ratio ranges, which directly affects the working performance of optocouplers. Specifically, the CTR range for level B is 130-260%, while the CTR range for level C is 200-400%. The CTR of gear C is higher than that of gear B, which means that at the same input current, gear C can deliver more output current.

The current transfer ratio of gear C is higher than that of gear B. The current transfer ratio of gear C is 200~400%, and that of gear B is 130~260%. Generally speaking, there should be no problem for gear C to replace gear B. Whether gear B can replace gear C depends on the specific conditions of the circuit.

Optocoupler 817B gear and C gear are only different in the coupling coefficient, but there is no difference in other aspects. The 817C and the general circuit B can be directly replaced, and the difference cannot be seen. If there is an impact, adjust the power supply resistance of the optocoupler and change the gain. You can meet the requirements.

Number of optical coupler channels: Both 817B and 817C are single-channel optical couplers with basically the same structure and can be used universally under certain circumstances.

The isolation voltage of the PC817 is 5000V, which is already the highest among optocouplers. So far, the isolation voltage without optocouplers is above 5000 V. If stability is required, you can use the PC817A, because the PC817's CTR (Current Transfer Ratio) has four grades A, B, C, and D, and the PC817 also has alternative models: such as the EL817 or the TLP781.

How does pc817 know which file it is?

The PC817 has B, C and D gears, which represent the difference in transfer coefficients. It can be simply understood that the sensitivity is different. The higher the grade, the higher the transmission precision and sensitivity, that is, the smaller the current required for luminescence measurement. The better the linearity.

Measurement method: Digital meter diode gear, measurement input side forward voltage drop is 2V, reverse direction infinite. The positive and reverse voltage drops or resistance values on the output side are close to infinity; when measuring the x10k resistance level of the pointer meter, there is an obvious difference in positive and reverse resistance. The forward resistance is about tens of kΩ, and the reverse resistance is infinite. Large; the forward and reverse resistance on pin 4 are infinite. Two meter measurement method.

The method of using a single multimeter to identify photocouplers is as follows: photocouplers connect input and output through light, and common types include light emitting diodes and phototransistors. When judging, it is necessary to test the performance of internal components and input-output coupling capabilities. The following is to illustrate the specific steps using PC817 as an example: Test the light emitting diode at the input end, adjust the multimeter to the resistance level (R×1 to R× 1K can be used), and measure the optocoupler input terminal ①② pins.

The method of measuring the PC817 optocoupler mainly includes the following steps: Measuring the input terminal: Using a digital multimeter, adjust the meter to the diode test gear. Test the two sets of pins on both sides of the PC817 separately, and normally conduct only once. When conducting, the red probe is connected to the anode and the black probe is connected to the cathode. These two feet are the low voltage end, or the input end. When testing the pointer meter, the red and black probe connections are reversed. Measure output: After confirming that the input terminal is conductive, keep the connection state of the input terminal.

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