Inside an edc v3 flashlight with schematic
I'll just assume that this unit is a clone of one of the many similar looking products. It's hard to…
Solar shed-light teardown with schematic
An intriguing solar shed light that uses a YX8183 chip I've not come across before. It's from the same company…
Guinness nitrosurge teardown – with schematic
A new twist on the original ultrasonic plate that was used to "surge" the classic Guinness drink to liberate the…
Apocalypse solar lighting system.
Something worth adding to this. During the current war against Ukraine the cost of power banks has been price gouged…
Horrible ebay ultraviolet floodlight with schematic
In the very best tradition of direct imports from China, this light has a few technical issues. I got this…
Unusual usb germicidal light with hideous design feature
This is a rather unique USB rechargeable UVC germicidal light I got secondhand from eBay. I've not seen any other…
Ikea sm hagel usb charger teardown
Thanks to John for sending me some of the new updated versions of the Koppla charger. Since reviewing that one…
Inside a mechanic’s test probe – with schematic
A very simple, but extremely useful 6-24V test probe that can detect polarity and force energise circuitry in either polarity…
Inside a fuel injector tester with schematic
More information from Andy Brown. The reason the coil is driven with two voltages is not for reducing power dissipation.…
pandemic theatre usb sterilising dongle
Since proper UVC sterilisation of a surface requires a decent output power and exposure time, I'd rate this dongle as…