Jump to content
Security Installer Community

Bellbox piezo drive circuit


CR Alarms

Recommended Posts

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

Link to comment
Share on other sites

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.

Link to comment
Share on other sites

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
Link to comment
Share on other sites

Join the conversation

You can post now and register later. If you have an account, sign in now to post with your account.

Guest
Reply to this topic...

×   Pasted as rich text.   Paste as plain text instead

  Only 75 emoji are allowed.

×   Your link has been automatically embedded.   Display as a link instead

×   Your previous content has been restored.   Clear editor

×   You cannot paste images directly. Upload or insert images from URL.

  • Recently Browsing   0 members

    • No registered users viewing this page.
×
×
  • Create New...

Important Information

By using this site, you agree to our Terms of Use.