A very simple device. I've never really considered that LCDs have an accurate threshold voltage at which a segment will change state. I get the feeling this display has a higher voltage than average.
The use of printed resistors is an interesting evolution from the traditional surface mount ones. I suppose that a variation in carbon ink thickness isn't too critical as it still results in an equally scaled voltage divider.
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The use of printed resistors is an interesting evolution from the traditional surface mount ones. I suppose that a variation in carbon ink thickness isn't too critical as it still results in an equally scaled voltage divider.
I specifically avoid using intrusive mid-run video adverts for a more relaxing viewing experience.
If you enjoy these videos you can help support the channel with a dollar or two for coffee, cookies and random gadgets for disassembly at:-
https://www.patreon.com/bigclive
Patreon supporters get early access to advert-free videos as they are made, and also regular live streams.
The Patreon support keeps the channel independent of YouTube's advertising algorithms allowing it to be a bit more dangerous and naughty.
Other contribution options are available at:-
http://www.bigclive.com/coffee.htm
#ElectronicsCreators
I like that if the unit fails you could still use it as a screwdriver.
Merci mon ami.
I wouldn’t ever test anything greater than 12v with these things.
I’ve been bitten before, once bitten twice shy
WOW. Simple but complicated. Very cool idea. Sure are some smart/creative folks out there.
Stalwart brand from Maxima in Estonia has same device._
You make good videos Clive and your warm voice is very pleasant!!
I got laughed at in vocational school when I told people that everything that is conductive and has a surface area, including humans, has a capacitance, and that is how the neon screwdriver thingy (as well as this) is coupled to ground by the user to complete the circuit… and the reason why you will likely feel a small buzz in your fingers if you accidentally touch a live circuit, even if you are standing on a dry wooden floor wearing wellies and touching nothing else… and why if you touch the radio antenna the reception may be greatly improved in certain circumstances, and why touching the core of an audio input cable will cause a buzz on the speakers. Among other things. Likely many of them still think there's just some obscure magic to how these things work.
That device is shockingly⚡basic! yet very clever design from the circuit point of view, but i wouldn't trust it for direct mains testing by any means.
Great device for killing its users .Never ever use a pen tester !Don't care what brand,Ideal Klein ,Fluke ,GB or Greenlee .Many an apprentice or journeyman have got themselves shocked or killed .Don't trust them in any way .
Please DON'T buy one of these. Get yourself a multimeter which are around £10
Crazy how little components these are in this. 100% optimized to be economical