speaker relay

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chrisp3

Member - Posts: 14

Joined: October 02, 2005

Location: United States

Posted: November 23, 2005 at 6:13 AM / IP Logged

HELP! This is a bit off the car audio topic...but I am trying to add a doorbell to an existing whole house audio system and need to know how to switch the speaker from the sudio system to the doorbell chimer when someone presses the button on the front door. I also need a soucre for a 24vdc relay. I am only switching one of the spkrs (out fo the pair) but need to do this on three differnet floors...(do I need three relays)? I don't know if I need...if if there is even such a thing..as a double pole or triple pole relay and need some guidance of how I might wire this up.

If anyone can point me in the right direction I'd appreciate it. THANKS in advance

hotwaterwizard

Silver - Posts: 1,350

Joined: December 11, 2003

Location: California, United States

Posted: November 24, 2005 at 2:07 PM / IP Logged

I need more details.

Are there 3 different Door bell buttons.

One button and 3 speakers hooked to the same output?

One Button and 3 different outputs?

Can the chime produce enough power for all 3 speakers?

Does the Stereo system have a preamp input?

A Schematic would help.

John DeRosa (Hotwaterwizard)

Stockton California

When in doubt, try it out !

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chrisp3

Member - Posts: 14

Joined: October 02, 2005

Location: United States

Posted: November 25, 2005 at 12:46 PM / IP Logged

hotwaterwizard wrote:

I need more details.

Are there 3 different Door bell buttons.

No. There is only one button.

One button and 3 speakers hooked to the same output?

Yes. I am using a Valcom chime unit (model 9927A) with a simple contact closure setup. Each of the speakers is attached to a volume control thru a Niles Audio VCS HUB that has internal impedance matching capabilities (which essentially provides continuity to all of the speakers at all times and it somehow internally monitors the circuit to keep it from overloading the amp).

Right now when the speakers are attached to the hub and I press the doorbell, nothing happens unless the volume control for that speaker is turned up. There is no way I can find to bypass the hub unless i physically remove the leads from the speaker and attach them to the Valcom unit. What I want to do is remove the speaker leads from the Niles HUB and insert a relay that is normally closed (thus allowing music to flow through it). When the button at the front door is depressed I want the relay to open (which will remove it from the Niles HUB) and momemtarily re-route it to the Valcom unit. Ultimatley I want the doorbell to take priorty over the speaker so that it will chime regardless of whether the volume control is turned on, off, or even if there is music passing through it..

One Button and 3 different outputs? One one button but three separate speakers (one on each floor). These speakers are normally playing music or mght be "at rest" with the volume control turned off.

Can the chime produce enough power for all 3 speakers? Yes.

Does the Stereo system have a preamp input? Yes it does but in order for it to work with a direct input to the amp....each volume control would always have to be "turned on" which might not always be the case.

A Schematic would help. I am not good with drawing schematics although I can read them most of the time. Here is a block drawing which might give you enough info. If not...let me know what else I can provide.

Thanks in advance for your time.

Chris

speaker relay -- posted image.

KPierson

Platinum - Posts: 3,527

This member consistently provides reliable information

Joined: April 14, 2005

Location: Ohio, United States

Posted: November 25, 2005 at 5:54 PM / IP Logged

There is such a thing as a 4PDT relay, four separate sets of contacts controlled by one coil. You should have no problem sourcing a 24VDC coil. Check out www.Digikey.com. You should be able to find an 'ice cube' relay, a small squarish relay that is made in a standard package, that you can buy relay bases for.

Kevin Pierson

hotwaterwizard

Silver - Posts: 1,350

Joined: December 11, 2003

Location: California, United States

Posted: November 25, 2005 at 7:22 PM / IP Logged

If you could find where the music goes into the amp you could simply switch between the door bell and the music with a relay.

Mono or Stereo?

John DeRosa (Hotwaterwizard)

Stockton California

When in doubt, try it out !

hotwaterwizard

Silver - Posts: 1,350

Joined: December 11, 2003

Location: California, United States

Posted: November 25, 2005 at 8:06 PM / IP Logged

speaker relay -- posted image.

You can get the relay at any place that sells parts for HVAC controls. I get them at Johnstone Supply

Appliance parts stores may have one as well.

John DeRosa (Hotwaterwizard)

Stockton California

When in doubt, try it out !

chrisp3

Member - Posts: 14

Joined: October 02, 2005

Location: United States

Posted: December 01, 2005 at 4:48 PM / IP Logged

Got it all hooked up today and all is good now. Speakers operate with music all the time. When the doorbell is pressed the relay switches the leads to the chime.....when the relay closes again...the music comes back on.

You guy's are great! Thanks for the help.

Now if I could only figure out what it will take to keep the relay open for 2-3 seconds. If I release the button too soon the chimer stops (because the relay is a m.o. and closes as soon as it loses power). It would be nice if I could press the button and have it remain in the open postion for a bit loger. Anyone know of a quick--inexpensive fix for this?

hotwaterwizard

Silver - Posts: 1,350

Joined: December 11, 2003

Location: California, United States

Posted: December 01, 2005 at 9:04 PM / IP Logged

speaker relay -- posted image.

This is a delayed on circuit you will have 5 seconds after power is supplied before the power comes on to the relay. If we could reverse the circuit some how. Hmmm Ummm I'll see what else I can come up with.

John DeRosa (Hotwaterwizard)

Stockton California

When in doubt, try it out !

KPierson

Platinum - Posts: 3,527

Joined: April 14, 2005

Location: Ohio, United States

Posted: December 02, 2005 at 6:34 AM / IP Logged

What kind of time frame are you on for a 'cheap' fix? I have some circuit boards scheduled for delivery in the next week that might be able to help you out. They will have a fully adjustable delay that can be set up to do several different things. Let me know if you are interested in 'testing' one for me.

Kevin Pierson

chrisp3

Member - Posts: 14

Joined: October 02, 2005

Location: United States

Posted: December 02, 2005 at 1:28 PM / IP Logged

My timeframe is sometime in the next couple of weeks. The installation is complete and the chime is working but there are some odds and ends that need to be cleaned up and we are waiting on parts. I would gladly accept your offer for testing. Thanks Chris

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