Home Alarm Siren circuit diagram/specs

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KS

20 posts

Geek

#258716 16-Oct-2019 22:29

Hello everyone,

My retired father is in the process of doing DIY home security system. They are in South Auckland, and the bad guy was trying to break in, while my father was sitting in the garage, listenning to music (!!!). Now my parents are under huge stress, and really need your help, guys.

He's got a siren, which used to be very common in New Zealand sometime ago, but there is no brand name, no circuit diagram, and no specs. Photos are attached.

The questions are: What's the voltage, polarity etc for this piece of equipment? If he just wants to run it, using a power supply, how shoud he connect the power supply and what kind of power supply does he neeed?

He wants to be able to run the siren(and the strobe light) remotely, by using a "smart home" relay.

If someone could help, my parents and I would really appreciate the help.

MuzaNZ

45 posts

Geek
+1 received by user: 36

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#2338612 17-Oct-2019 09:24

Most of these sirens tend to run on 12v DC and draw less than 0.5Amps

You just need to power the circuit board in the siren with 12v and it will run, i'm not sure on which terminal is for positive and negative tho.

sittingduckz

689 posts

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#2338631 17-Oct-2019 09:39

Using a multimeter, you could check the resistance between the sirens neg lead and the 2 power terminals. If you get a low or no resistance on one of these you could assume that was the neg power terminal.

It looks like you can't see ther curcuit board at all :)

I'm not a complete idiot, I still have some parts missing.

KS

20 posts

Geek

#2339923 17-Oct-2019 20:51

sittingduckz:

Using a multimeter, you could check the resistance between the sirens neg lead and the 2 power terminals. If you get a low or no resistance on one of these you could assume that was the neg power terminal.

It looks like you can't see ther curcuit board at all :)

Thanks for your response. Yes, the board is completelly covered - I think it's kind of moisture protection..

Unfortunatelly, we did try the method you suggested - it didn't help: the resistance is exactly the same on the both... but thank you anyway.

If there is anybody, who actually had some experience with those - I would appresiate your help. Those sirens used to be present on almost every second house some 7 - 10 years ago. Please, please help :)

KS

20 posts

Geek

#2339924 17-Oct-2019 20:56

MuzaNZ:

Most of these sirens tend to run on 12v DC and draw less than 0.5Amps

You just need to power the circuit board in the siren with 12v and it will run, i'm not sure on which terminal is for positive and negative tho.

Thanks for you response. We belive, that taking into account the board structure (as far as we can see) wrong polarity coould permanently domage it. So we need to know for sure, before trying. So if someone had experience with it, could you please share your valuable knowlege?

sparkz25

750 posts

Ultimate Geek
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Inactive user

#2339946 17-Oct-2019 21:58

That is a PC3 siren driver This will solve your problems

KS

20 posts

Geek

#2340286 18-Oct-2019 15:22

sparkz25:

That is a PC3 siren driver This will solve your problems

Thank you very much! That's exactly what I was looking for :))