Connecting CMOS relay outputs in parallel

[b1miller]

I am designing a circuit in which I will be driving 3 separate solid state optomos relays. Clare # LBA110. The supply voltage is 5vdc. Is there any problem paralleling the outputs to drive an LED or Sonalert? Spec sheets don't address this issue, but based on my limited cmos knowledge, it should work.

[Robert Reed]

I'm assuming that the relays either supply pos. voltage or ground the LED circuit. If nothing else, you could "OR" gate them thru three separate diodes.

[MrAl]

Hi there b1,


It looks like the 'relay' 'contacts' could drop as much as 3v at
100ma, and with a supply voltage of only 5v this could be significant.
How well this will work to drive an LED then depends on what kind
of LED and how much current the LED is going to draw. For example
it may not work with a white high power LED (350ma) as the relay
may drop too much voltage to allow the proper current to flow in
the LED. A test would have to be done to see just how bright the
LED gets. On the other hand, a 20ma LED may work just fine, or
underdrive the high power LED to draw less than full current.

[b1miller]

I am going to be driving an small LED rated at about 10-15mA and a Sonalert, but the voltage is actually 9vdc. It looks like I will be ok to breadboard up and test tonight.
Thanks for all your info.