This is an insect bite relief pen I got from AliExpress. I'm not sure if the vibration actually does anything other than indicate that the unit is active.

Now I'm back at my usual bench, I've tested the heater for its power rating and the run time.
At 3V the heater passed 480mA suggesting a power dissipation of 1.44W and a hot resistance of around 6.25 ohms.

When the button is pressed, the circuit board turns on the load for exactly 2 minutes and thirty seconds. It could be quite useful on its own as a fixed time load energiser. If switching an inductive load, make sure a standard diode is put across the load (band towards positive) to protect the transistor from the high voltage spike when the load turns off.

This is the listing this device came from as a bundle deal:-
https://www.aliexpress.com/item/1005009458033431.html
It's showing as about double the price of the bundle deal, so it may be worth looking at the listing and seeing if it then pops up in the bundle section of the website.



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#ElectronicsCreators
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