Smoke Alarm

Hello to all nice people; I appreciate advice on what to do as I am not as clever as some of you out there. I have a "First Alert" smoke detector installed under the house next to the heating furnace. I intend detaching the peeper from the detector and bring it up into my study via a 6 metre long 6 core telephone type cable so that I can definately hear it. However preliminary test showed that the peeper sounded too soft (quiet) with this length of cable. Obviously some sort of amplification is required. Has anyone out there any simple ideas? Thank you for any useful information.


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Don't muck around with an existing smoke alarm and compromise its safety, you are asking for trouble. Use one of the 12V wired smoke alarms designed to attach to a home alarm system. You could even use a low cost one or two zone alarm system to monitor it, then you get proper battery backup protection etc. You can even get wireless smoke detectors, once again designed for home alarm systems.

Dave :)

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David L. Jones


** If the beeper has more than two wires ( my example of a First Alert alarm has three ) make SURE you have it wired in the correct order to the PCB.

....... Phil

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Phil Allison

Buy the item suitable for the job.

System Sensor 2012H

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Operates off 12 volts and has an normally open set of relay contacts which would be suitable for connection of a secondary sounder.

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David Sauer

a> it sounds like the capacitance of the phone cable is too high - you could try using cable with a lower capacitance. eg: tv-antenna ribbon. b > Reassemble the alarm and use a baby monitor with the squelch turned up.

c > replace the sounder on the alarm with a diode pump. run the DC from this through the phone cable at the other end use the DC to trigger an alarm.

maybe something like this: .---- +V | [SIREN] 10nF | || / --> >--||--. |/ || | .----------| | | |\| .->|-+-->|---->...>---+-[100K]-. ~\ | | | ---> >-+------------->...>------------+----+---- 0V Bye. Jasen

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On Tue, 4 Jul 2006 11:16:55 +1000, "thesnowbaron" put finger to keyboard and composed:

Depending on the design, you may be able to wire an optocoupler across the existing beeper. Then use the output of the optocoupler to control a second, remote, battery powered beeper. Alternatively, if an LED illuminates when the siren goes off, then you could wire the optocoupler in series with the LED.

- Franc Zabkar

Please remove one 'i' from my address when replying by email.
Reply to
Franc Zabkar

Jaycar have a 12V hardwired smoke detector on sale that has NO and NC relay contacts for remote alarms, or other devices. LA-5045 $24.95 each.

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