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24 vac diode

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gestern1

New Member
Can someone out there tell me how to put a diode in a 24 vac circuit? I am installing a motion detector on a sprinkler circuit and need to for the motion detector to turn on the sprinkler valves (main and zone). I need to put a diode in the motion sensor line so the main and zone valves do not feed back through the motion circuit.
If there is such a thing as a 24 vac diode, what am I looking for?
I know enough about electronics to wire circuits but when it comes to changing voltages and such, I am at a loss.
Thanks,
Mike
 

mvs sarma

Well-Known Member
Can someone out there tell me how to put a diode in a 24 vac circuit? I am installing a motion detector on a sprinkler circuit and need to for the motion detector to turn on the sprinkler valves (main and zone). I need to put a diode in the motion sensor line so the main and zone valves do not feed back through the motion circuit.
If there is such a thing as a 24 vac diode, what am I looking for?
I know enough about electronics to wire circuits but when it comes to changing voltages and such, I am at a loss.
Thanks,
Mike
WELCOME Gestern1 to Electro-Tech-Online !
Why not use a relay and control it by the coil?
Of course you can use an opto-diac like MOC3020, buffered by a TriAC from outside.
 
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gestern1

New Member
opto-diac

I thought about using a relay but I can't seem to find a 24 vac relay locally.
As I mentioned in my posting, I am at a loss when it comes to changing voltages and that kind of stuff so help me out with "layman terms" when replying and offering any suggestions. Thanks.
 

crutschow

Well-Known Member
Most Helpful Member
A diode rectifies AC to DC.

What is the output of the motion detector?

If it's a standard 110V motion detector that operates a light, then you could wire the light output to a 110VAC coil relay that will connect the 24VAC sprinkler voltage to the sprinkler.

If you can't find such a relay locally, you can order from such websites as Digikey or Mouser 110vac relay.
 

gestern1

New Member
Thanks crutschow.
My neighbor had a 24vdc relay and using a diode bridge we were able to use the 24 vac to power the relay, thus being able to complete the circuits to the valves.
Thanks to all who helped.
Mike
 

mvs sarma

Well-Known Member
Thanks crutschow.
My neighbor had a 24vdc relay and using a diode bridge we were able to use the 24 vac to power the relay, thus being able to complete the circuits to the valves.
Thanks to all who helped.
Mike
Nice that you managed the issue. Congratulations Mike
!!
 
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