Defective nightlight autopsy, half-assed fix and improvements.
bigclivedotcom 15:47
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I quite enjoy doing autopsies on defective electronic equipment. It's like a puzzle to not only find the defective components, but to work out the reason why they failed and then try to fix the device or make it better.
In this case the fault was caused by a thermally stressed component that causes the light to use more actual metered power when it's not lit! It would actually be an improvement to just have it lit all the time at lower intensity.
Update:- I did fit a much lower value capacitor (100nF), a new discharge resistor (1Mohm) and chopped the resistor feeding the sensor circuitry and also chopped out the front indicator LED. The result was a bright splash of light on the wall surrounding the unit with a power consumption that I estimate at about 0.2W, and that didn't even show up on the Hopi or other power monitor socket.
If you enjoy these videos you can help support the channel with a dollar for coffee, cookies and random gadgets for disassembly at:-
http://www.bigclive.com/coffee.htm
This also keeps the channel independent of YouTube's advertising algorithms allowing it to be a bit more dangerous and naughty.
In this case the fault was caused by a thermally stressed component that causes the light to use more actual metered power when it's not lit! It would actually be an improvement to just have it lit all the time at lower intensity.
Update:- I did fit a much lower value capacitor (100nF), a new discharge resistor (1Mohm) and chopped the resistor feeding the sensor circuitry and also chopped out the front indicator LED. The result was a bright splash of light on the wall surrounding the unit with a power consumption that I estimate at about 0.2W, and that didn't even show up on the Hopi or other power monitor socket.
If you enjoy these videos you can help support the channel with a dollar for coffee, cookies and random gadgets for disassembly at:-
http://www.bigclive.com/coffee.htm
This also keeps the channel independent of YouTube's advertising algorithms allowing it to be a bit more dangerous and naughty.
Category (YouTube): Science & Technology
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