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Your cart is empty. PC817 1-channel optocoupler isolation module adopts 5.0 pitch screw terminals for convenient wiring. PC817 optocoupler board is suitable for isolation when the output level of the single-chip microcomputer is used to drive inductive components such as motors, and anti-interference protects some circuits of the single-chip microcomputer. The output level of the single-chip microcomputer is low, and the driving voltage of the driven module is high for level matching. For example, some PLC inputs require 24V voltage, which can be converted by this module. Used for inverter, can invert the input signal and output. Used for high voltage detection, for example, the output signal level of a certain sensor is 12V, and the voltage of single-chip microcomputer is 5V. PC817 module can be used to isolate and detect. Current amplification. For example, when the output current of the MCU is too small to drive certain circuits, this module can be used for amplification. The module adopts optocoupler isolation, which is stable and reliable and has a long service life.
PC817 parameters:
Input signal voltage: DC 3V-5V/12V/24V (optional)
Output signal voltage: wide voltage suitable for DC1.8V-24V
EL817 features:
Isolation voltage is greater than 3000V
Input current max 50MA
Working current>1MA
Maximum output current 50MA (input current must be 15-20MA)
Working temperature -55~110 degrees.
Maximum application signal frequency: 5KHz
Package Included: 6pcs 1-Channel PC817 Optocoupler Isolation Module
S Miller
Reviewed in the United States on January 7, 2025
Another reviewer already did an excellent deep dive into the technical details of these isolation modules and there's not much I can add to that, so I'll just say that all of the boards I got look good and seem to be working as expected.
Todd K. Moyer
Reviewed in the United States on January 2, 2025
Not that this is a bad thing! At the price when I ordered them, these modules cost me far less than the individual components would.There is no data provided with these modules, really. Here are a few key points:The input of the optocoupler is an LED, but on the board there are a red visible LED and a 1k resistor in series with that. So you need about 2.5 V on the input before any current flows, to light the internal LED. The red visible LED lights up to indicate there is current flowing into the optocoupler. If you see red light (other than a very faint glow), probably the optocoupler is 'on', though the state of the output depends on a variety of factors.The output of the optocoupler is an NPN transistor collector which pulls to ground if the internal LED is on (and with sufficient current flowing). This output is pulled up to the supply voltage via a 10k resistor, so the output voltage will equal the supply voltage, if you turn off the internal LED, and you don't pull any current out of the output. Over a wide range, you can use whatever voltage you like, from about 1.0 - 24 V according to the product page. My calculations, and the data sheet, indicate up to 50 V is ok. Above 50 V you risk over-powering the 10k resistor.You could change the resistors on the board to accommodate other current levels. The output transistor is specified to go up to 50 mA, so a lower output resistor might speed up operation a bit on pull-up, and would be fine if you keep the voltage lower.From the oscilloscope captures you can get a feel for the delays in turning on and off. Rough numbers are 5 us delay from turn-on to the output voltage dropping to 50%, and 30 us from turn-off until the output rises to 50%. Note: turning on the LED means the output voltage goes low.I swept output voltage v. input voltage for a range of output supply voltages from 2.0 - 10.0 V. Higher output voltages require somewhat higher input voltage to cause the output to get to (approximately) zero.I also did a couple sweeps at very low output supply voltages (Note also that my sweeps should be considered "typical"... it's not guaranteed that every unit will have as much gain as the one I tested.All in all this is a great set of optocoupler modules for a very low price. You can use these for a wide variety of applications, especially if speed is not critical.
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