Lord_grezington
- May 3, 2013
- 124
- Joined
- May 3, 2013
- Messages
- 124
Hello
I am looking to protect my pcb using an optocoupler.
I am looking to use low cost components, input into the optocoupler varies (could be 10, 12 or 24Vdc). Output needs to be a standard 5Vdc.
However I have noticed that all the low cost variations of the optocouplers are only rated up to 6V revers for the revers bias diode. Am I looking at the wrong thing here? A high current is not needed so anything up to 50mA is ok. I will only need a frequency of around 11Khz.
Optocouplers are good for digital signals, however I am also looking have a analogue 4-20mA signal which I am putting through a 249Ohm resistor to convert into a ~1-5V analogue signal. Is there any possible way of isolating this as well reliably? I only need around 8 bits and the sampling speed will be very low (does not need to be any higher than 100Hz)
Thanks
I am looking to protect my pcb using an optocoupler.
I am looking to use low cost components, input into the optocoupler varies (could be 10, 12 or 24Vdc). Output needs to be a standard 5Vdc.
However I have noticed that all the low cost variations of the optocouplers are only rated up to 6V revers for the revers bias diode. Am I looking at the wrong thing here? A high current is not needed so anything up to 50mA is ok. I will only need a frequency of around 11Khz.
Optocouplers are good for digital signals, however I am also looking have a analogue 4-20mA signal which I am putting through a 249Ohm resistor to convert into a ~1-5V analogue signal. Is there any possible way of isolating this as well reliably? I only need around 8 bits and the sampling speed will be very low (does not need to be any higher than 100Hz)
Thanks