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Author Topic: need help on smps like circuit  (Read 888 times)
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gurinder_dhiman
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« on: September 26, 2009, 11:01:15 11:01 »

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



gurinder_dhiman@yahoo.co.in
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pickit2
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« Reply #1 on: September 26, 2009, 12:22:33 12:22 »

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
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jestanoff
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« Reply #2 on: September 26, 2009, 09:37:14 21:37 »

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. 
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