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UK diy (uk.d-i-y) For the discussion of all topics related to diy (do-it-yourself) in the UK. All levels of experience and proficency are welcome to join in to ask questions or offer solutions. |
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#1
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My garage is separate from the house by about 20m. There is currently
a bit of a worry about security and I have rigged up a burglar alarm. It then struck me that it would be a bonus if I could link a smoke alarm into that too. Electronics is my training so I don't have any problems in that area, but I've dismantled the smoke alarm (ie got it out of the plastic !) and am puzzled to see that the piezo sounder has 3 leads - why ?. The IC is under the sensor cover - would anyone know if that is likely to have a dc output rather than the switching one for the sounder ? Thanks Rob |
#2
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In article ,
robgraham writes: My garage is separate from the house by about 20m. There is currently a bit of a worry about security and I have rigged up a burglar alarm. It then struck me that it would be a bonus if I could link a smoke alarm into that too. Electronics is my training so I don't have any problems in that area, but I've dismantled the smoke alarm (ie got it out of the plastic !) and am puzzled to see that the piezo sounder has 3 leads - why ?. The IC is under the sensor cover - would anyone know if that is likely to have a dc output rather than the switching one for the sounder ? Look at this thread: http://groups.google.com/group/uk.d-...205e3d276d90f2 -- Andrew Gabriel [email address is not usable -- followup in the newsgroup] |
#3
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robgraham wrote:
My garage is separate from the house by about 20m. There is currently a bit of a worry about security and I have rigged up a burglar alarm. It then struck me that it would be a bonus if I could link a smoke alarm into that too. Electronics is my training so I don't have any problems in that area, but I've dismantled the smoke alarm (ie got it out of the plastic !) and am puzzled to see that the piezo sounder has 3 leads - why ?. The IC is under the sensor cover - would anyone know if that is likely to have a dc output rather than the switching one for the sounder ? Thanks Rob Another option would be to install a 12v detector like the Menvier m12. -- Toby... remove pants to reply |
#4
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Hi
There are many smoke alarms out there (as posted) operating on 12v or you can buy a 240v unit with relay from most good diy outlets or if you are near an alarm supplier see if they do an adapter unit . As for the 3 wire to the piezo I can only think it is for the test button as some piezo sounders are dual voltage amd have 3 wires (com ,low,high). HTH CJ |
#5
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In article ,
Toby writes: robgraham wrote: My garage is separate from the house by about 20m. There is currently a bit of a worry about security and I have rigged up a burglar alarm. It then struck me that it would be a bonus if I could link a smoke alarm into that too. Electronics is my training so I don't have any problems in that area, but I've dismantled the smoke alarm (ie got it out of the plastic !) and am puzzled to see that the piezo sounder has 3 leads - why ?. The IC is under the sensor cover - would anyone know if that is likely to have a dc output rather than the switching one for the sounder ? Thanks Rob Another option would be to install a 12v detector like the Menvier m12. but bear in mind that 12V buglar alarm smoke detectors don't have a sounder built in to them - they rely on the alarm to do that. -- Andrew Gabriel [email address is not usable -- followup in the newsgroup] |
#6
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On Nov 26, 3:43*pm, robgraham wrote:
My garage is separate from the house by about 20m. *There is currently a bit of a worry about security and I have rigged up a burglar alarm. It then struck me that it would be a bonus if I could link a smoke alarm into that too. *Electronics is my training so I don't have any problems in that area, but I've dismantled the smoke alarm (ie got it out of the plastic !) and am puzzled to see that the piezo sounder has 3 leads - why ?. The IC is under the sensor cover - would anyone know if that is likely to have a dc output rather than the switching one for the sounder ? Thanks Rob Just to keep this thread going ('bumping' I believe), the smoke alarm in question is a cheapy from BnQ (~£6) called a Fire Angel. It dismantles quite easily though the labelling on the back needs to be ripped off, and the pc board comes out OK - I then desoldered the ionising device cover and found an IC in there which conveniently comes up on the web (RE46C122). Pin 2 of this is designed for triggering other alarms and goes high when the alarm goes off - isn't that convenient ! There is a track from this pin to the test/hush switch which will make a good output point. I haven't tried it yet, but this gives me the 'in' that I wanted - assuming that there aren't variations on this IC that don't comply with the data sheet of course !! Rob |
#7
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robgraham wrote:
On Nov 26, 3:43 pm, robgraham wrote: My garage is separate from the house by about 20m. There is currently a bit of a worry about security and I have rigged up a burglar alarm. It then struck me that it would be a bonus if I could link a smoke alarm into that too. Electronics is my training so I don't have any problems in that area, but I've dismantled the smoke alarm (ie got it out of the plastic !) and am puzzled to see that the piezo sounder has 3 leads - why ?. The IC is under the sensor cover - would anyone know if that is likely to have a dc output rather than the switching one for the sounder ? Thanks Rob Just to keep this thread going ('bumping' I believe), the smoke alarm in question is a cheapy from BnQ (~£6) called a Fire Angel. It dismantles quite easily though the labelling on the back needs to be ripped off, and the pc board comes out OK - I then desoldered the ionising device cover and found an IC in there which conveniently comes up on the web (RE46C122). Pin 2 of this is designed for triggering other alarms and goes high when the alarm goes off - isn't that convenient ! There is a track from this pin to the test/hush switch which will make a good output point. I haven't tried it yet, but this gives me the 'in' that I wanted - assuming that there aren't variations on this IC that don't comply with the data sheet of course !! Rob Did you work out why there are 3 cables to the sounder? -- Adam |
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