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through beam siren

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lucyisaly

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hi i only have basic knowledge of electrics, i need a circuit to sound a siren and light a beacon (combined unit if possible) when a send and receive through beam is broken, the circuit is to be 24v i have 415v, could anyone advise on what components to use as i have looked on rs website and there are so many different photocells im not sure what to buy, they also dont list a suitable transformer any help is greatly appreciated
 
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