Hi, Everyone i am new to this forum and seeking expert advice from other members regarding a design.
i made a PIC project and 6 outputs feed into a 6 nos of opto and then into a common NPN transistor does this
work or it is stupid? please help.....

 

Yes it would work, but if the optocoupler has the current rating, then just drive the relay directly on the collector pulling to ground with a back emf diode across the relay coil, and omit the extra transistor.

 

Sad to tell but any LED is slight-slightly differing from it neighbor even in frame of one wafer. Thus the ignition voltages differs, minimum minimorum by few milivolts, but in heavy cases even with so much as 100 mV. Thus, brutally forced parallel, ONE will ignite and take ALL the current on self, whilst other may happen be under the ignition begin level. Thus one is going to xplode, then second, then third... like a shoot from Kalashnikoff.
The only corrective action You need is the small (few Ohms may be enough) in series (separate) for each opto-diode.

 

i made a PIC project and 6 outputs feed into a 6 nos of opto and then into a common NPN transistor does this

It would work, but why not just OR the PIC signals using a logic gate, and then connect that to one opto?
That would be simpler and cheaper.

 

Am I missing something, but why not OR the six PIC signals in software and use one opto and one transistor?

 

Am I missing something, but why not OR the six PIC signals in software and use one opto and one transistor?

Perhaps there are 6 PICs, the OP only says "PIC project".

 

It would work, but why not just OR the PIC signals using a logic gate, and then connect that to one opto?
That would be simpler and cheaper.

If you configure the PIC outputs as open collector, you wouldn't even need any logic.

But to be honest I don't know if this is possible with a PIC.

 

Certainly the circuit will function, although it is rather unusual. And just as certain the words of post #3 do not apply in any way, shape, or form. I believe that thread has been hacked and hijacked.