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CR Alarms

Bellbox piezo drive circuit

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Hi all, I have a question for you experts, something I have been wondering for a while,What voltages do the piezo's run at in the bellboxes? and are they a shock hazard? On many bellboxes I fit I notice the piezo's are connected to a small transformer on the pcb, (at least I think its a transformer it certainly looks like one). When the sounder is operated I notice the voltage pen lights up red around the cables to the piezo's. I know the xenon strobe circuit is definitely a shock hazard (High voltage strobe capacitor and trigger transformer). 

 

Do the piezo's run at high voltage when sounding and are they shock hazard? 

 

Just curious, thanks

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Piezo speaker drivers are generally driven from a supply of 2-5V. Within the driver oscillator circuit this is normally increased upto 30V to increase the volume output. Although implementation of electronics and components may vary by manufacturer.

They should not be a shock hazard like the strobe circuit would be, although I am certainly not recommending you poke components within your favourite brand of glowy flashy thing.

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Posted (edited)

Thanks :), don't worry I have no intention poking around inside the components. I had a pretty nasty belt  from a strobe once some years ago,NOT NICE! I put it down to inexperience, luckily the bellbox wasn't too high up. cheers

Edited by CR Alarms
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