Help with optocoupler

[monty_mm]

Hello everyone,
i've started with electronics as a hobby. i want to use an optocoupler with my ECG circuit. I have an HCNR200 but i could not figure out how to use it. Can anyone help? i need the output to be between 0-3 volts because i want to feed it to a PIC18 microcontroller and then i can play with the PIC!!

any help will be greatly appreciated. if there is a better optocoupler out there that would do the job, it would be nice to know as well! thanks in advance.

 

[eblc1388]

The HCNR200/201 high-linearity analog optocoupler. You can download the datasheet at the following link.

cp.literature.agilent.com/litweb/pdf/5989-2137EN.pdf

The datasheet contains many example circuits for analogue interfacing applications.

 

[monty_mm]

thanks, i will try to go through it and simulate. I will post the circuit i made if i was successful! cheers

 

[monty_mm]

Back again,
spent the night trying to work this out.
i've attached my circuit for comments (opens with Paint but not with MS Photoeditor for some reason!!). basically, its supposed to be ECG circuit, and i've included the HCNR200 opto as per the datasheets for basic isolation. Can someone have a look and see whether what i have done so far is correct?

i also want to take the output from here to a PIC microcontroller, i'm thinking i'll probably need some kind of protection to prevent voltages more than 5V going to the PIC. any ideas? i have no idea whatsoever cause i'm very new to electronics. thanks.

 

[monty_mm]

guys,
any help would be appreciated if someone could review my circuit (post 3) and comment whether i used the isolator correctly. thanks.

 

[audioguru]

Your schematic is not cropped and its parts are very far apart. It is the size of my entire neighbourhood. I can see only a small part of it at a time.