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Title: need help on smps like circuit Post by: gurinder_dhiman on September 26, 2009, 10:01:15 10:01 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 [email protected] Title: Re: need help on smps like circuit Post by: pickit2 on September 26, 2009, 11:22:33 11:22 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 Title: Re: need help on smps like circuit Post by: jestanoff on September 26, 2009, 08:37:14 20:37 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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