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I have this lamp which runs off of a 12V DC power supply provided. There's a faint ticking sound coming from the power supply, sort of like the sound and volume of a watch tick, but it's happening around 5-6 times per second. What part of the power supply would cause this audible effect? Is it some kind of switching relay for AC rectification? If it helps, this happens whether it's on or off.

Please note I'm not looking for advice on how to dampen the sound, I'm just curious.

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    \$\begingroup\$ Sounds (ha) very strange and annoying. Have you asked the manufacturer if this is normal? \$\endgroup\$ – Spehro Pefhany Feb 11 at 16:30
  • \$\begingroup\$ I haven't, but a lot of the Amazon reviews report light flickering at the highest brightness around that rate, and one person said this was fixed by replacing the 12V adapter with a higher wattage one. \$\endgroup\$ – PascLeRasc Feb 11 at 16:34
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    \$\begingroup\$ Usually sounds at that low a frequency are related to the power supply kicking into protection, so maybe the manufacturer provided an inadequate AC adapter. That's pure (educated) speculation on my part. \$\endgroup\$ – Spehro Pefhany Feb 11 at 16:37
  • \$\begingroup\$ Possibly helpful answer: electronics.stackexchange.com/questions/130588/… \$\endgroup\$ – Electrical Architect Feb 11 at 16:41
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    \$\begingroup\$ Have you connected the output of the power supply to a scope to see if there's a coinciding spike/dip in voltage? I agree with Spehro, it's probably not providing adequate power. \$\endgroup\$ – JYelton Feb 11 at 16:52

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