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Hi Guys,

I'm looking for some relay ideas.

What I would like to accomplish to use my dial selective intercom unit to turn on and turn off items when you dial a ext number to turn on something or off.

For an example, dial ext 2 to turn on a external bell for the garage and have it stay on until you dial the same ext or a different one to turn it off. This would be replacing a TKM-6 Adjunct Switch that has the ringing pairs.

Another idea I would like to play around with is using a relay to turn on or off a closet light or back yard light.

My dial selective intercom unit uses 10 V AC so I really do not have any idea what type of relays I should use to accomplish this.

Also would the relay have to have a constant-power supply for them to operate?

Thanks Brian

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Brian -

There are latching relays - that lock in to one state or the other until energized again. All the things you're looking to accomplish are do-able.

It may be easier to reverse the power on your DICM. Have the buzzers rest on 10VAC and then switch ground through the ICM. This way (if you have all the grounds in the Power supply commoned) then you can use relay that has a 24VDC coil (using B Battery off your Power Supply).

Sam


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latching relay would do it. I am messing with one now...we use them a lot for access control.


Jeff Moss

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Hey Sam and Jeff.

I found this item

Model: LARY-AC

LARY-AC AC Latching Relay with DPDT contacts

And here is the website

http://www.azatrax.com/latching-relay.html


Would something like this work? Now I know this relay can not be used to switch a high voltage item such as a 75 watt light bulb

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It seems like it would, If you needed to switch higher voltages use that relay to control a relay that had a more "serious" coil. If I remember correctly, this is called a "Class 3" circuit in the electrical business (High Voltage circuit controlled by a low voltage circuit). You should be able to find them in any electrical Supply House (or on line).

Sam


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Jeff Moss

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Hi Sam,

I need some calefaction on" buzzers rest on 10VAC" what do you mean?

Also when I do reverse wire the power on the DICM, would I reverse both A and B battery?.

Would I leave the 10 VAC for the audible supply or would I need to make any changes to the audible supply and to the audible supply Ground.


One idea that I was thinking about is to get a spare DICM unit and reverse wire it and only use this unit for the relays. And then have a relay to transfer the Tip/Ring pair to the spare DICM unit and when you done making a section for a relay dial the ext for the return relay to transfer you back to the normal DICM unit.

Thanks Brian

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NO!

A & B Battery stay as they are.

Signal ground becomes 10VAC.

Signal Battery is Ground.

In the new normal condition 10VAC is always present on one side of the buzzer. When you dial a digit, the DICM sends ground.

This is much easier. That Ground now can buzz a buzzer, trip a relay, do whatever...

Sorry for taking so long. I've been offline for a few days.

Sam


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Thanks Sam,

If I need to use 24VDC to switch a relay, would use 24VDC B Battery Ground as the audible supply and then B Battery as audible supply ground?


What I was thinking since I think I might a have a Expansion Module for my DICM unit is leave the first unit in the original configuration and then use the Expansion Module for switching the relays since the Expansion Module does have a separate audible supply input.

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Originally Posted by Silversam
"It may be easier to reverse the power on your DICM. Have the buzzers rest on 10VAC and then switch ground through the ICM. This way (if you have all the grounds in the Power supply commoned) then you can use relay that has a 24VDC coil (using B Battery off your Power Supply)."

Sam

Brilliant suggestion, Sam!


Ed Vaughn, MBSWWYPBX
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