FiremanSam
New Member
Hi all,
I am struggling with a current project due to my current electronics knowledge being limited to the words electric and solder.
I basically need to wire up a pager to an external, louder alarm/siren as it only gets reception in one part of my flat and I am normally in another room with music/tv on.
I played around with sound sensitive designs but all the circuit kits I bought I must have soldered to death as they didn't work, and wiring up a microphone and just amplifying the sound picked up alot of environmental noise.
I have since got a spare pager and have opened it up, removed the vibration device and tried to create a circuit. The external siren I have needs mains power to run, so I got one of those multi-connection adaptors, spliced into it and had the power running into the pager where the vibration device was, back out to the siren and the from the siren back to the power to complete the circuit.
This worked fine when I tested it but I have since noticed that if the power is on then the pager doesn't get reception (tested with another one placed next to it).
I assume this is due to the amount of power flowing through the pager? (The pager runs of AAA battery and the minumum I can drop the adaptor down to is 4v).
So i figured that if I could wire up a circuit for the power and siren, and have it broken by a relay which is only triggered when the pager gets a message, this would isolate the power from the pager.
However, the two relay's I have used don't seem to be triggered by the pager. Not sure if this is a power issue? Perhaps the output the the pager would send to the vibration device is very small?
Can anyone help me resolve this or help me find a relay that can be triggered by low power (if this idea will actually work!)
Thanks in advance.
Jon
I am struggling with a current project due to my current electronics knowledge being limited to the words electric and solder.
I basically need to wire up a pager to an external, louder alarm/siren as it only gets reception in one part of my flat and I am normally in another room with music/tv on.
I played around with sound sensitive designs but all the circuit kits I bought I must have soldered to death as they didn't work, and wiring up a microphone and just amplifying the sound picked up alot of environmental noise.
I have since got a spare pager and have opened it up, removed the vibration device and tried to create a circuit. The external siren I have needs mains power to run, so I got one of those multi-connection adaptors, spliced into it and had the power running into the pager where the vibration device was, back out to the siren and the from the siren back to the power to complete the circuit.
This worked fine when I tested it but I have since noticed that if the power is on then the pager doesn't get reception (tested with another one placed next to it).
I assume this is due to the amount of power flowing through the pager? (The pager runs of AAA battery and the minumum I can drop the adaptor down to is 4v).
So i figured that if I could wire up a circuit for the power and siren, and have it broken by a relay which is only triggered when the pager gets a message, this would isolate the power from the pager.
However, the two relay's I have used don't seem to be triggered by the pager. Not sure if this is a power issue? Perhaps the output the the pager would send to the vibration device is very small?
Can anyone help me resolve this or help me find a relay that can be triggered by low power (if this idea will actually work!)
Thanks in advance.
Jon