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This board is helpful for connecting digital systems (like a 5V microcontroller) to a high-voltage or noisy system. This board electrically isolates a controller from the high-power system by use of an opto-isolator IC. This IC has four LEDs and four photodiodes built-in. This allows the low-voltage side to control a high voltage side.
We often use this board to allow a microcontroller control servos or other motors that use a higher voltage than the TTL logic on the (3.3V or 5V) micro, and may cause electromagnetic interferance with our system as the motors turn on and off. This board will isolate the systems, creating a type of electrical noise barrier between devices.
This breakout board uses the TLP281 optoisolator and discrete transistors to correct the logic. Comes with four channels. Great for use in noisy circuits where signal lines require electrical isolation.
A normal LED opto-isolator will invert the logic of a signal. We threw some transistors on this compact board to correct the inversion. What you put into the IN pins, will be replicated on the the OUT pins, but at the higher voltage (HV).
Package Included:
3 * TLP281 Optical Coupler Isolation Module
dfroien3
Reviewed in the United States on December 3, 2024
The product does work, but not without adding an external transistor to drive a simple LED. While the product does provide isolation, it is ineffective if it can't drive any significant output. The intention was to use this to drive multiple isolated outputs. Since it was ineffective, I was forced to design my own set of 4n25 opto circtuits. I would NOT purchase this again.
A teacher
Reviewed in the United States on October 25, 2024
I found a great solution to isolate my 4 bit universal shift register 74LS194 from the bipolar stepper motor driver board. My signals 1100, 0110, 0011, 1001, back to 1100 , etc were used to drive my H- bridge stepper motor driver board 9001 . The driver was connected to our pancake 5 volt bipolar stepper motors. Unfortunately, my students and I were burning out the driver boards as we often test or troubleshoot our circuitry. Our solution was to use the TLP281 opto-isolator board to couple the shift register signals to the stepper motor driver board. Since then, we have not burnt out any of our H - bridge driver boards or damaged the shift register output pins 12,13,14,15 on the 74LS194. Now, our stepper motor controller system works great and the opto-isolator boards were helpful in the reliable circuit design. I strongly reccomend trying this opto-isolator board out for any switching that requires the type of isolation that is mentioned above.
N.H.
Reviewed in the United States on January 31, 2023
I was designing a simple arrays of Relay circuits. This meet my need perfect with 4 channels. it has 4 opto-couplers and 4 transistors. It will provide low output when you give it a high TTL signal.
Conundrum
Reviewed in the United States on September 15, 2022
If you're planning on using this for 5V Vcc, know that the off-time is around 30-40us.Pic is 5V, 5kHz, 50% Duty Cycle.For things like limit switches, this would be fine. But for anything that requires timing at 5V, it's useless if you care about the output going low at the right time.
FredInIT
Reviewed in the United States on July 23, 2022
Just a note - you can drive input and output at 5vDC just fine - you don't need the full 24V indicated in the drawing. Also, you can drive these at about 5-8KHz before the output Hi and Lo are no longer the same amount of time. These are perfect for optoisolation by sitting between your limit switches and CNC controller PCB.
Basic Bostonian
Reviewed in the United States on September 25, 2021
So, I had a problem with one out of three of these in my first order: the 4th channel had reversed polarity.I shrugged, because they are very inexpensive, and got three more to have spares. Well, so far, the first one channel 1 is dead, and the second one, only channel 3 works. I haven't tested the third yet.So, this is a very simple circuit, and honestly, if I could get say 4-5 out of 6 working, I wouldn't care at the price point. But 50% bad? That's not good enough.
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