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I am trying to silence my air purifier (Philips AC5659/10). I think it uses a piezo-buzzer (front & back of PCB visible on page 4 of this document). In a similar vein to this question, I would like to know if it's safe to just remove the disc, leaving the inside of the buzzer disconnected?

enter image description here

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  • \$\begingroup\$ it's safe if you don't break it. have you tried tape? \$\endgroup\$ Commented Jan 8, 2022 at 22:53
  • \$\begingroup\$ I have tried tape and putting some silicone, but it's barely muffled. So I am verifying if it's OK for this circuit to just remove the internal disc without replacing it with anything. \$\endgroup\$ Commented Jan 8, 2022 at 22:56
  • \$\begingroup\$ Most probably yes. \$\endgroup\$
    – winny
    Commented Jan 8, 2022 at 23:17
  • \$\begingroup\$ It is redundant \$\endgroup\$ Commented Jan 9, 2022 at 0:28
  • \$\begingroup\$ Take a plastic cap of a bottle and glue it over it. \$\endgroup\$
    – Codebeat
    Commented Jan 9, 2022 at 23:51

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I did this with my toaster oven because it was ear splitting loud. Unplug the device, take a flat head screw driver just pry it a bit at the bottom of the black cylinder. If it's anything like my piezo was, and they look very similar, it's a plastic cylindrical cap on top of a plastic tube base that houses a piezo disc inside. The cap popped right of and I took the disc out essentially leaving an open circuit in its place. Wasn't even glued in place.

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  • \$\begingroup\$ That's exactly what I did. I've removed the piezo disc. I am only contemplating if leaving an open circuit there could have some residual effects. From what I get from this question: electronics.stackexchange.com/questions/297304/… this could be an issue with transformers, but I don't think that's the case with this PCB. However, my electronics knowledge is fairly limited, so I am looking for some confirmation from experts in this area. \$\endgroup\$ Commented Jan 9, 2022 at 1:04
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    \$\begingroup\$ @KarolJ.Piczak It's fine. Designers usually aren't spiteful enough with deep enough pockets to put in circuitry to detect whether the piezo is open/functional or not to disable the entire device. \$\endgroup\$
    – DKNguyen
    Commented Jan 9, 2022 at 1:04
  • \$\begingroup\$ I did not expect to find any specialized circuitry to detect this kind of tampering. I was more concerned with what potential physical side effects could happen assuming that this circuit wasn't designed for such a situation. But I've managed to strip the piezo disc, leaving it open as in the picture, and so far it seems to be working fine. \$\endgroup\$ Commented Jan 9, 2022 at 23:37
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I can now add an empirical answer to this - I've removed the piezo disc, and everything seems to be working fine so far, totally silenced.

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