how to detect Ac

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Yes, a relay will work in this instance.
Sometimes size is a concederation and relays/sockets may be larger than acceptable.
Relays are also mechanical, some designs may call for solid state.
Cost may also be an issue, relays and sockets run around $5-$7 for the set, the components I listed will be around $1.
Wiring may also be a constraint on design, with relays, switched power needs to be wired, where the design I posted supply the power (2 wires vs 4)

Don't beat yourself up too bad for reading the whole thread.
 
Still a bit pricey compared to the handful of components on my sketch ($3.50 to $4.33 vs 2.00).

But probably easier to design around...
 
A small gap there indeed but make it up pretty quick figuring in BOM list savings (what you have to STOCK), assembly time and not to mention real-estate. Big on getting 2 pounds in a one pound around here.
 
I bookmarked the page & downloaded the spec sheet. When I run low on high voltage caps and zeners I'll order up some.

I love this place...
 
Well Its a simple and ready made solution, dont have to build anything really.. I dont know about you ,but here I can get a relay and its socket for less than a dollar ... but yr right about the solid state thing..
 
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