jocanon
Member
I am building a theater room in my house with a projector that will be ceiling mounted inside a hush box to keep the noise and heat the projector generates out of the theater room. In order to do this without over-heating the projector inside the hush box, I had to build ducting with an in-line duct fan to pull cool air through a filtered vent from the ambient air in the theater room, through the hush box to cool the projector and suck out the hot air, and then ultimately dump it into an adjacent room.
So I have everything done (or at least on paper), except I just need a way to turn the in-line duct fan off and on when the projector is on. I was going to use a thermostat switch inside the hush box until I realized the projector has a 12v trigger that comes on whenever the projector is on. So my plan now is to connect a 12v relay to this trigger and use it to switch the 120 VAC mains power to the in-line duct fan. Is this as simple as using this switch by soldering the coil leads to a cord that I plug into the 12v trigger and then using the contact leads on the relay to switch the mains power? Or should I put a capacitor between the 12v trigger and the relay to smooth it out? If yes, do you know what capacitor I should use? Or is there something else I need to do that I have not thought about? Thanks for any help with this:
https://www.mouser.com/ProductDetai...EpiMZZMtSzCF3XBhmW1upDI8uprbL%2b6ui%2bElcbnE=
Another question I had is the above is rate for 250 VAC. I am in the US so I use 120 VAC, does the 250 VAC rating mean it can go up to 250 VAC so 120 VAC would be fine because it is less than 250? Or do I need to use this one that is rate at 120 VAC? Actually, the below is rates at both 250 VAC and 120 VAC (my guess is both would be fine, the first one just didn't put the 120 VAC rating on it even though it would work):
https://www.mouser.com/ProductDetai...=sGAEpiMZZMtSzCF3XBhmW0jFivbULW3rPEZOlpMvDjM=
So I have everything done (or at least on paper), except I just need a way to turn the in-line duct fan off and on when the projector is on. I was going to use a thermostat switch inside the hush box until I realized the projector has a 12v trigger that comes on whenever the projector is on. So my plan now is to connect a 12v relay to this trigger and use it to switch the 120 VAC mains power to the in-line duct fan. Is this as simple as using this switch by soldering the coil leads to a cord that I plug into the 12v trigger and then using the contact leads on the relay to switch the mains power? Or should I put a capacitor between the 12v trigger and the relay to smooth it out? If yes, do you know what capacitor I should use? Or is there something else I need to do that I have not thought about? Thanks for any help with this:
https://www.mouser.com/ProductDetai...EpiMZZMtSzCF3XBhmW1upDI8uprbL%2b6ui%2bElcbnE=
Another question I had is the above is rate for 250 VAC. I am in the US so I use 120 VAC, does the 250 VAC rating mean it can go up to 250 VAC so 120 VAC would be fine because it is less than 250? Or do I need to use this one that is rate at 120 VAC? Actually, the below is rates at both 250 VAC and 120 VAC (my guess is both would be fine, the first one just didn't put the 120 VAC rating on it even though it would work):
https://www.mouser.com/ProductDetai...=sGAEpiMZZMtSzCF3XBhmW0jFivbULW3rPEZOlpMvDjM=