need help on smps like circuit

[gurinder_dhiman]

hi to all

i need a solution to connect more than one siren to a circuit using extrnal power supply(12v 1A) and my circuit supports only one siren (12v 350ma). so i need a circuit to do this, what i have
1. i have a driver circuit 12v 350 ma(can operate only one siren)
2. power supply 12v 1ma
3. and sirens (12v 350ma)

just need to add more siren

please reply



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[pickit2]

Replace the original siren with a relay or a power fet, and you can have as many siren as you like.
if you can't drive the relay direct you could add optocoupler with transistor to drive relay

[jestanoff]

If your siren is just a speaker (for example 4ohm 10W) without any electronics, you can use power amplifier for each additional speaker. I recommend you to use TDA7056 in this case, because it is expensive and easy to use. If your siren includes electronics, you can follow advice of pickit2.