Circuit Isolation

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L

Lighty

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Hi All

I've got a circuit that has a 12V output from a ULN2803A for driving a relay, how ever I would like to opto couple it for extra safety.

Could you please advise if this circuit will work?

The optocoupler I thought of using is a TLP521-1, which has a input voltage 1.15V, probably not the best? wanting to use a DIP4 package for a easier board.

Thanks
 

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No need to isolate it further. The relay itself provides the isolation.

An optocoupler would be unnecessarily redundant.
 
Won't work as drawn.

ULN2803 is open collector. You need to hook resistor to +V and cathode to ULN2803 output.
 
smanches said:
No need to isolate it further. The relay itself provides the isolation.

An optocoupler would be unnecessarily redundant.
Click to expand...

I do realise that, just thought I would make it "safer" but seem to be too much of a problem

crutschow said:
Obviously a belt + suspenders type.
Click to expand...



mneary said:
Won't work as drawn.

ULN2803 is open collector. You need to hook resistor to +V and cathode to ULN2803 output.
Click to expand...

Like this? (attached)
 

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