I need to take a 0 - 100 VDC PWM signal, run it through an isolator, and have a 0 - 5 VDC voltage that fluctuates in parallel with the PWM signal. The PWM input needs to be isolated from the 0 - 5 output. The output drives a volt gauge that has a 0 -100 volt scale with the air core in the gauge driven by the 0 - 5 VDC signal. I’m looking at the BOB 09118 opto isolator as a possibility. I can adjust the 0 -100 VDC input with a voltage divider. Just need to know if the 09118 is simply “on/off” orif it works like a light dimmer and will vary the 0-5 volt output voltage based on a varied input voltage on the other side?
Hi Jedpo.
Unfortunately we only carry one optoisolator and it’s not really setup for a 100 volt input. Our [BOB-09118 might work for you if you add a 10K resistor IN1 pad and connect your PWM source between that resistor and GND. (GND on the same side of the board as IN1)
On the other side of the board, connect 5v to HV and you should get a 5 volt signal out the OUT1 pad that tracks your PWM signal coming into IN1.](https://www.sparkfun.com/products/9118)
Thanks for the quick response. I have an adjustable voltage divider so I can get the PWM voltage down. This might just work.