You are trying to use the I/O Linc's +5 volt 10 ma power supply to run an ELK-924? It will not power the relay board. It needs 12 or 24 volts at a minimum of 60 ma when both relays are on. If you power it with an external 12 volt supply you can use the I/O Linc's +5 volts through its relay contacts to trigger the ELK-924. Or you could use the external 12 volt supply for the ELK-924 and switch it into one of the trigger inputs thorough the I/O Linc's relay contacts. Only one of the two trigger inputs has to be used. Depends on what the trigger voltage and polarity is.
Sorry mdyod. i'm just would like to get a circuit diagram to build up a converter, which can trigger from my IP camera I/O output to the 12Vdc Siren. The output value it's only +5Vdc, but it can't voice up the 12Vdc Siren as well. So i need the converter to run the 12Vdc Siren. Any suggestion mdyod? Can give a help pls?
Do you have a 12 volt power source and 12 volt siren? That you need to be triggered by a 5 volts source or are you attempting to use a DC to DC converter? If you are trying to up convert 5 volts to 12 volts with enough current to drive the 12 volt siren. It is going to need a very heavy current on the 5 volt source.