Inside an LCD voltage tester (with schematic)

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bigclivedotcom

bigclivedotcom

Жыл бұрын

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.
I specifically avoid using intrusive mid-run video adverts for a more relaxing viewing experience.
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#ElectronicsCreators

Пікірлер: 257
@nigel-matthews
@nigel-matthews 2 жыл бұрын
You spoil your viewers (and Patreons) making these tear down videos even while you’re traveling for work. The behind the scenes videos of the show in the castle are fascinating!
@zyeborm
@zyeborm Жыл бұрын
I'm kinda hoping Clive can use KZfaq to retire, he'd have to be one of the few KZfaqrs with around a million subs who still has a day job. Perhaps he has retired and is taking the fun jobs. Let's hope that's the case 🙂
@nigel-matthews
@nigel-matthews Жыл бұрын
@@zyeborm he’s definitely one of the hardest working KZfaqrs.
@sebastian19745
@sebastian19745 Жыл бұрын
I first have seen one of these around 1997. Then I got one and I used it and I found it very useful as a non-contact indicator but also as raw voltage indicator. As a plus, it have a small flat screwdriver. Since then, I had many, just because I used to lost them, but no one ever broke.
@danedewaard8215
@danedewaard8215 Жыл бұрын
Thank you for explaining this device!!! I bought one at the dollar store a few years ago and always thought it was a VERY STRANGE THING!!!! I may start using it now. Thanks again!
@DieselTjuv
@DieselTjuv Жыл бұрын
We use these to test our electric horse fence. However, when testing an electric fence you need to make sure that you DO NOT touch the terminals on the end of the tester, since it will give you a proper shock :) Just touching the fence with the screwdriver bit alone is sufficient to make the flash symbol appear. Also, this is a much cheaper electric fence tester than a "proper" tester (and anything related to horses is for some reason at least 4 times more expensive)
@thephilpott2194
@thephilpott2194 Жыл бұрын
Horse eqpt: Yes- they assume you have enough money that a huge mark-up won't be noticed. All a bit naughty.
@tin2001
@tin2001 Жыл бұрын
You can get digital fence meters for under $100AU (roughly £50) on eBay. You can get ones with LEDs for different voltage ranges fences use for around $20 (with actual ground wires instead of the user). There's also ones in the hundreds of dollars, which are no doubt more accurate and better built... But if you're just checking the voltage at the far end, a rough idea is good enough. I've just been using the back of my hand though. We can't find the actual meter.
@DieselTjuv
@DieselTjuv Жыл бұрын
@@tin2001 Yep, I'm not interested in the actual voltage, just that there is voltage. Back of the hand is of course the cheapest option :)
@davidfalconer8913
@davidfalconer8913 Жыл бұрын
A bit like " medical " stuff for old folk .... hideously expensive .... litter grabber = £15 , Poundland™ = £1 ..! ! .........
@rjmun580
@rjmun580 Жыл бұрын
You have an electric horse? Watt is its name?
@VarionJimmy
@VarionJimmy Жыл бұрын
Interesting indeed! Was curious about the Non Contact path. And of course, raw LCDs are always a bit mystical. It would be fun with a video about them. Perhaps how to (re-)use them for own projects? Or just an exploration.
@TheRailroad99
@TheRailroad99 Жыл бұрын
Crazy how little components these are in this. 100% optimized to be economical
@sadn0x281
@sadn0x281 2 ай бұрын
hence why it's so cheap xD normally i wouldn't buy it but it was so cheap i decided meh why not (it was $0.75 in my local store)
@maxmotion8470
@maxmotion8470 Жыл бұрын
It somewhat reminds me of a fever Thermometer. Love your Videos and watched them for years, you inspired me to start studying Electrical Engineering last year! Thank you very much for your interesting Videos:)
@kimvibk9242
@kimvibk9242 Жыл бұрын
Let's hope the doctor doesn't mix them up...'You have a temperature of 110 V - take an aspirin and a resistor and call me tomorrow"...😀
@poppy5525
@poppy5525 Жыл бұрын
I think you're bang on dude. I reckon that the casing is literally an off the shelf part. Originally for dollar store thermometers, repurposed for volt meters.
@RFC-3514
@RFC-3514 Жыл бұрын
@@poppy5525 - Are "dollar store (body) thermometers" a thing? That's the kind of device that is usually regulated (same as pregnancy tests, etc.) and sold only in authorised places. Though I guess they can sell them anywhere if they label them as something else.
@dantronics1682
@dantronics1682 Жыл бұрын
@@poppy5525 actually the voltage screw driver was out before the thermometer,I have one thats I bought in the early 90s
@markfergerson2145
@markfergerson2145 Жыл бұрын
@@RFC-3514 All that's required is a disclaimer (printed in a font so small an ant would need a microscope to read it) to the effect of "not to be used to make medical diagnoses".
@KeritechElectronics
@KeritechElectronics Жыл бұрын
Had one in my old lab, nice for a very quick test but a typical neon indicator is way more reliable, and a multimeter is way more useful. This thing is so astonishingly simple!
@Kitsaplorax
@Kitsaplorax Жыл бұрын
I'd hope to see a destructive safety test with this. How does it react to 480 or 1 Kilovolt? High humidity might make it conducive.
@markfergerson2145
@markfergerson2145 Жыл бұрын
With an ammeter between the touchpad and earth.
@mrbyamile6973
@mrbyamile6973 Жыл бұрын
@@markfergerson2145 I read your comment as "an amateur" thats probably also likely to happen 😄
@markfergerson2145
@markfergerson2145 Жыл бұрын
@@mrbyamile6973 Lol!
@LarixusSnydes
@LarixusSnydes Жыл бұрын
This would be a great fit for Photonic Induction, but BigClive also has a device to test the insulation between transformer windings.
@wimwiddershins
@wimwiddershins Жыл бұрын
We had a gadget to remove the static charge on CRT screens that had a display that was powered by the discharge (little lightening bolt). Bit of a "solution looking for a problem" thing.
@RFC-3514
@RFC-3514 Жыл бұрын
You needed to discharge static from CRT screens if you used one of those completely useless "radiation filters". So it was really a solution to a problem caused by a non-solution to a non-problem. :-P
@BuyitFixit
@BuyitFixit Жыл бұрын
"I have dangerously defeated the safety shutter...." - I thought "Danger" was your middle name? :)
@acmefixer1
@acmefixer1 Жыл бұрын
This suffers from the same problem a DMM has: there is not enough load on the circuit to determine if the circuit is connected or if the voltage that is read is from capacitive coupling. Say the breaker for the circuit has been turned off. The capacitive coupling from another conductor in the same conduit could make you think that the circuit's breaker is still closed. This is why professional electricians use a Wiggy with the solenoid that pulls the indicator to the correct voltage, and takes a few milliamps of current. Thanks, Clive. I think the cheap, little neon light indicators might be better for residential electrical testing.
@thephilpott2194
@thephilpott2194 Жыл бұрын
Yeah, i recall double checking with an analogue meter when working on a ring main that i was certain that i'd isolated......the DMM was coming up with phantom voltages from adjacent conductors.
@drkastenbrot
@drkastenbrot Жыл бұрын
proper multimeters have a low z mode for that
@straightpipediesel
@straightpipediesel Жыл бұрын
All of the Fluke DMMs for professional electricians or industrial workers have a low impedance mode. (Fluke 113, 114, 117, 87V). It's a solved problem, without having to resort to old fashioned techniques.
@davidg4288
@davidg4288 Жыл бұрын
@@thephilpott2194 I had that problem at my Dad's house years ago, there was enough capacitive coupling to show 80 volts or so on a disconnected circuit on an analog multimeter! This was in USA with 120 volt mains. My fingers showed nothing so I continued my work.
@Gold63Beast
@Gold63Beast Жыл бұрын
Love you BigClive. I Never knew about print on resistors. Really cool. You learn something new everyday. 🙏
@janami-dharmam
@janami-dharmam Жыл бұрын
I recently saw one set-top box remote that had the resistors printed on the green solder resist. The PCB was single side and made very cheaply (the battery leaked and one electrolytic capacitor went bad). The connections were all low resistance values (acting like jumper wires).
@amorphuc
@amorphuc Жыл бұрын
Fascinating. Thanks Big Clive.
@johncrook4469
@johncrook4469 Жыл бұрын
Your videos are truly amazing!
@EverBeyondRadio
@EverBeyondRadio Жыл бұрын
"Probably Fairly Safe"...😆
@ianrtait5721
@ianrtait5721 Жыл бұрын
Excellent explanation. Very informative.
@whitesapphire5865
@whitesapphire5865 Жыл бұрын
I have a couple of these, somewhere. I've never really been convinced of their worth, but as a quick test of "YES/NO" potential being present, they might be alright, though I think I'd still prefer an active method of testing before putting any fingers at risk. As a rule I use the "Lo-Z" feature on my Fluke.
@zyeborm
@zyeborm Жыл бұрын
A positive indication means danger, a negative indication doesn't mean squat lol. I'd still test with the meter then crowbar it just to be sure 🤣
@richardbriansmith8562
@richardbriansmith8562 Жыл бұрын
Awesome Video big clive
@TC_here
@TC_here Жыл бұрын
I always found phase testers/Voltage testers like this a strange bit of kit.. Stick this screw driver into the mains and touch the metal bit at the top.. if it lights up you have power :) What could go wrong..
@wargamingrefugee9065
@wargamingrefugee9065 Жыл бұрын
And that's why God invented the apprentice.
@gordonm2821
@gordonm2821 Жыл бұрын
I agree, never trust anything where you are part of the circuit
@plainedgedsaw1694
@plainedgedsaw1694 Жыл бұрын
I heard about some people testing mains presence by chewing on whole toothpick to make it more conductive and to feel the shaking when they poked the mains with it.
@muzikman2008
@muzikman2008 Жыл бұрын
I used to remove the resistor out of neon testers and wrap a bit of copper wire around its leads to effectively short it out, twist the neon legs together, then put it back in. That stopped the idiots using death trap tester Screwdrivers... 😂☠️.. I didn't really, but should have pmsl. Drop these lcd testers in the sea and watch it glow like its user.. Bin them.
@plainedgedsaw1694
@plainedgedsaw1694 Жыл бұрын
@@muzikman2008 those testers have their place, sometimes you don't have second point to measure against. I do have a few stray single wires around my house, that turned out to be live, but there really isn't a point around where i could ground one probe of dmm to find out.
@wavemaker54
@wavemaker54 Жыл бұрын
It would be cool to know what equipment you use when making these videos. Someone on here probably knows or there’s a previous post with all the info already gathered together. Clive, I appreciate your knowledge and the desire to share and teach what you’ve learned throughout your career. Thank you.
@Electronics-Rocks
@Electronics-Rocks Жыл бұрын
So simple I bought one for my dad and myself from CPC back in the eighties. I lost my one year's ago.but now I have my dad's after passing. The back on ours is either welding or very well glued as even had it run over by cars. I found very useful throughout my years nice to have one. A bit disappointed not sealed for safety as used my one in the wet never a problem but Clive would not have made a video.
@johndododoe1411
@johndododoe1411 Жыл бұрын
If outside is wet or dirty, power can reach finger no matter what's inside.
@jp040759
@jp040759 Жыл бұрын
WOW. Simple but complicated. Very cool idea. Sure are some smart/creative folks out there.
@jensschroder8214
@jensschroder8214 Жыл бұрын
The LCD can be compared to small capacitors, which are also the display.
@curtishoffmann6956
@curtishoffmann6956 Жыл бұрын
"It's probably fairly safe." "Here, hold my pint."
@TATICMOOR
@TATICMOOR Жыл бұрын
I used to have one of these many a year ago, it was handy to use the end as a flat terminal screwdriver too.
@I4get42
@I4get42 Жыл бұрын
Hi Clive! Cool video as always. Hope you are doing well 😊. This kind of reminds me of the old Nintendo Game & Watch where fixed characters would get turned on and off. Though that was of course DC low power.
@tomschmidt381
@tomschmidt381 Жыл бұрын
Interesting circuit taking advantage of LCD operation. It looks safer then the neon screwdriver I have where you touch the clip to provide enough capacitive coupling to cause the neon indicator to glow.
@Lucius4992
@Lucius4992 Жыл бұрын
Interesting. I have had one of those for many years now, no one died yet, also never teared it apart and mostly used it as a small screwdriver for adjustments. It was always weird for me to think that we are supposed to stick our fingers in it while connected to mains and without knowing what's inside. I damaged the lcd by using an igniter just for fun. Thank for the video!
@stephenmanning1553
@stephenmanning1553 Жыл бұрын
When I first lived in the outback of Western Australia there were a lot of remote "properties" with local gensets producing 36VAC. there were 36V light globes available in the shops. Sorry I don't remember if there were 36V washing machines, radios or whatever?
@Knaeckebrotsaege
@Knaeckebrotsaege Жыл бұрын
Had one of these in all black when i was a teen 20+ years ago. Difference was mine had actual metal buttons and the whole thing was definitely not openable (I tried.. obviously :D). Definitely neat to find out how these thingies work so many years later
@wisher21uk
@wisher21uk Жыл бұрын
Looks cool Clive thanks just hope they’re safe, I always double check with my fluke meter and switch the mains off completely, you may laugh but my friend got a shock as his flat was wired to nextdoors flat ....
@TheTruthAboutLemmings
@TheTruthAboutLemmings Жыл бұрын
What a nicely minimalist design. I've got one and just assumed it had a chip and button battery in it
@LarixusSnydes
@LarixusSnydes Жыл бұрын
This is in fact an Integrated Circuit, but on a macro scale and without using silicon Fascinating to see it seemingly perform switching, but without a single transistor.
@LawpickingLocksmith
@LawpickingLocksmith Жыл бұрын
Amazing!
@twocvbloke
@twocvbloke Жыл бұрын
I've had a few of these in the past, never used them for testing, just as a crap screwdriver, cos I usually made them go crunch either through too much torque or from using them to pry stuff open... :P
@d.t.4523
@d.t.4523 Жыл бұрын
Great. Do they make a current clamp version? I should incorporate that into my HV gloves, as a visual indicator. Good luck. 👍
@dcallan812
@dcallan812 Жыл бұрын
Handy bit of kit.. I dont think I would let my mother loose with it but stil luseful.
@Shaun.Stephens
@Shaun.Stephens Жыл бұрын
Merci mon ami.
@daveschmarder-1950
@daveschmarder-1950 Жыл бұрын
This device is self-testing. If the resistors become shorted, there will get an indication of you screaming as you touch the mains.
@CanizaM
@CanizaM Жыл бұрын
Based on the title (and the HUGE TEXT in the thumbnail) I was momentarily confused that this was some sort of special tool for assisting with the repair of LCD monitors and the like. Also noticed the packaging claims it has a "fine display". Not great, not bad, just fine.
@Kitten-Master
@Kitten-Master Жыл бұрын
a remarkably simple device. i may have a few laying around. or at least something similar in external design never actually used it before... always just used a meter
@edgarmatzinger9742
@edgarmatzinger9742 Жыл бұрын
Looks like a rectal thermometer to me. It would a problem if that thing would report 110v when inserted....
@Neovo.Geesink
@Neovo.Geesink Жыл бұрын
If you have the Uni-T or another meter which can measure Ohms, You can probe the LCD to check if it will react to that low voltage. If no reaction, try swapping the polarity, but I recon that it Will show the symbols for a brief period untill the crystals will realighn.
@johns2038
@johns2038 Жыл бұрын
I might become a patron for these early access videos...
@bigclivedotcom
@bigclivedotcom Жыл бұрын
Right now the Patreon feed has a lot of backstage show stuff not released on the main channel.
@dimitar4y
@dimitar4y Жыл бұрын
@@Okurka. yes, the normal electrical videos, not his actual job with the backstage show stuff, which actually requires him to put more effort and take "time off" the work he does itself. Also 1$ is not a pay wall lol
@d.t.4523
@d.t.4523 Жыл бұрын
@@Okurka. There is not likely any technical disassembly going on backstage. His "videos" are for technical reference, for we techs. Random goings on isn't his normal video, so it's not meant for this venue.I'm not a patron, so don't blame me for defending his choice of content. I like the techie stuff, and don't have time for the random content. Good luck to you. Make me some videos if you like, but don't complain about my preferences. Thanks for your input. 👍
@dimitar4y
@dimitar4y Жыл бұрын
@@Okurka. oh woowee, 2 dollar, i'm going BROKE. Dead broke! End of the world! :l
@Mark1024MAK
@Mark1024MAK Жыл бұрын
@@dimitar4y - if you’ve got some spare cash, send it my way and I will find a good cause for it 😊
@dblitroot
@dblitroot Жыл бұрын
The common connection in These types of LCDs are driven by AC voltage. The common connection on these types of LCDs is called the "Back-Plane". The segments are capacitively coupled to the Back-plane. To turn the segment ON it has to be driven with the voltage that is 90 deg out of phase to the BP. When in phase with the BP the segment is OFF. I think the voltage is what will destroy an LCD, not the current. Also, they absolutely must be driven by AC voltage. DC voltage will light up a segment, and can be used as quick test, buy it will "burn" it after a short time.
@frogz
@frogz Жыл бұрын
wheres the micro?? love it lol
@jussikuusela7345
@jussikuusela7345 Жыл бұрын
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.
@davidbarrass
@davidbarrass Жыл бұрын
Are you doing the Tatoo this year? I was watching some of your work on Saturday from the Simple Minds concert down in Princes St Gardens
@andrewsmart2949
@andrewsmart2949 Жыл бұрын
ford tried the screen printed components thing on an ignition module called "thick film ignition",it was terrible,at least you can replace it with a bosch module that works LOL
@MsLancer99
@MsLancer99 Жыл бұрын
I've brought one of these from Poundland but now I can't find it. It's great fun to use
@richkh
@richkh Жыл бұрын
That blue plastic shell has been repurposed from a digital thermometer. Made from the same molds.
@janami-dharmam
@janami-dharmam Жыл бұрын
that is called innovation!!
@kevinmartin7760
@kevinmartin7760 Жыл бұрын
How much voltage would it take to arc between the traces to the NCV terminal, bypassing the resistors? Those clearances look pretty small!
@IanSlothieRolfe
@IanSlothieRolfe Жыл бұрын
The seperation for mains voltages (240-400v) reccommended is 4 to 6 mm so I would say the seperation on this gadget is barely adequate, although the resistors would prevent a significant (i.e. dangerous) current flowing. I'd be happier if there where some kind of solder mask or other insulating coating on the board personally, but I think the NCV test is relying on the capacitive coupling between the probe connection and the track (the bit of trace going round the probe connection acts as a capacitor), so they had to run it fairly close.
@kevinmartin7760
@kevinmartin7760 Жыл бұрын
@@IanSlothieRolfe The only protective resistor would be the one next to the NCV contact, and there is also a narrow gap there potentially bypassing that resistor. The other hand contact is well-isolated by a resistor.
@PeterShipley1
@PeterShipley1 Жыл бұрын
do you have for the old neon bulb screwdriver testers. I'm sure the younger viewers have never seen one.
@joelmurphy9369
@joelmurphy9369 Жыл бұрын
that's a brilliant design. optimize everything and reduce component requirements to zero. Supply chain kerfuffle-proof! Clive, you are so good at giving us a close up view of the things... why, for sooth, won't you show us a close up of the instructions!?!?
@eded8045
@eded8045 Жыл бұрын
i got 2 now as gifts from Ali years back ))
@weerobot
@weerobot Жыл бұрын
Cool .
@BlondieSL
@BlondieSL Жыл бұрын
WAIT! WAIT!!! You mean that's NOT a rectal thermometer? OMG! O.... M.....GGGGGG....! So my temperature isn't 120V? ROFL 😅😂🤣 Sorry, I just had to.
@kevinhardisty6465
@kevinhardisty6465 Жыл бұрын
Clever in it’s simplicity
@RIXRADvidz
@RIXRADvidz Жыл бұрын
what a fluffy soft comfy bench, are you going to upgrade your bench when you get back to the island? as nice and fluffy comfy as this bench is, it's probably not a good idea for all the burning and shorting that goes on, owell, it was a dream for a moment.
@albear972
@albear972 Жыл бұрын
It looks like they repurposed a common LCD thermometer to make this item.
@laernulienlaernulienlaernu8953
@laernulienlaernulienlaernu8953 Жыл бұрын
Does the direct test still give you a tingle if you touch an earth while testing mains voltage? ⚡
@fortuner123
@fortuner123 Жыл бұрын
The one I bought in Thailand instructed you not to touch both buttons at the same time! I have no idea why but because of that I never use it!
@tncorgi92
@tncorgi92 Жыл бұрын
I am curious, how much did that cost? I just had to buy one, at the home improvement store they ran from 10 dollars to about 30, depending on the bells and whistles you want built in.
@calv6051
@calv6051 Жыл бұрын
This one is from Poundland in the UK. It costs £1 or £2.
@tncorgi92
@tncorgi92 Жыл бұрын
@@calv6051 that's pretty good, the one I bought doesn't have that kind of LCD display. Just LEDs and a beeper.
@tundramanq
@tundramanq Жыл бұрын
Bare LCD displays are damaged and eventually destroyed by exposure to sunlight. The whole screen progressively turns black permanently. Make sure the display has a very good UV filter plate on top around UV sources..
@dantronics1682
@dantronics1682 Жыл бұрын
it only cost a quid
@DjResR
@DjResR Жыл бұрын
Stalwart brand from Maxima in Estonia has same device._
@OneBiOzZ
@OneBiOzZ Жыл бұрын
I have not seen printed resistors in a very long time
@robsmith9392
@robsmith9392 Жыл бұрын
Iv an odd question not directly related, I think I have an access point being scrammed by dodgy mains voltage something like transients Without breaking the bank and spending a mass fortune in high end Fluke equipment, have you any idea how I can detect these as I just may be barking up a wrong tree…
@Slikx666
@Slikx666 Жыл бұрын
It looks like a Poundland thermometer but slightly different. 🤔👍
@dougiedrever7168
@dougiedrever7168 Жыл бұрын
more soda stream vids please
@Pulverrostmannen
@Pulverrostmannen Жыл бұрын
Man I would like to test the insulation properties of this pen with my 3KV supply to see how it would react both in LCD and Isolation properties
@Leahi84
@Leahi84 Жыл бұрын
How are you getting the zoomed photos when you're not at home? Just curious.
@bigclivedotcom
@bigclivedotcom Жыл бұрын
I improvised a studio setup and bought a new printer for shared use at work.
@q12x
@q12x 2 ай бұрын
It would be good to explain why it is functioning. My impression is that 50Hz in the mains and in my body (as an antenna) will drive each segment of the LCD through its coresponding printed resistor. Each of those numbers are in fact a single segment shaped as a number or shape(the flash).
@bigclivedotcom
@bigclivedotcom 2 ай бұрын
The LCD requires very low current, but does need a voltage threshold. It's done with a high resistance voltage divider, with you as one of the resistors.
@q12x
@q12x 2 ай бұрын
@@bigclivedotcomhmmm... I believe the complete answer is that the LCD is driven with 3V AC! _sinusoidal_ at 50Hz. From practice I know a LCD segment is working with 3V DC at 100Hz alternating in both the pos and neg rail.Basically an AC but made from a square wave.
@German_byte
@German_byte Жыл бұрын
I like that if the unit fails you could still use it as a screwdriver.
@crazygeorgelincoln
@crazygeorgelincoln Жыл бұрын
One could try to make it waterproof to stop the moisture escaping.
@benespection
@benespection Жыл бұрын
A really interesting design compared with the traditional neon bulb death traps, but I still really hate the idea of testing if a circuit is live by becoming a part of the circuit itself. I think I'll stick with my non-contact volt pen for any quick live/dead verification and smugly enjoy my 1000 V isolation. :)
@Oneloudest
@Oneloudest Жыл бұрын
Are you not working the Tattoo this year? Always loved watching the behind the scenes footage.
@ernstoud
@ernstoud Жыл бұрын
Note the large distance between the C and the E in the CE mark. This is a Chinese Export product. For sure not compliant with any safety standard.
@Jimmyfisher121
@Jimmyfisher121 Жыл бұрын
That is what I call lawyer print, you know when it is important information when it is a micro dot.
@gavincurtis
@gavincurtis Жыл бұрын
LCD adventure afterparty: kzfaq.info/get/bejne/m62BhLp6x6qRnoE.html
@Dave96z34v2
@Dave96z34v2 Жыл бұрын
Should have made it with a conformal coating to prevent moisture arc over.
@bitelaserkhalif
@bitelaserkhalif Жыл бұрын
Alas, I thought it was a multimeter crammed in small thermometer packaging
@davidfalconer8913
@davidfalconer8913 Жыл бұрын
For £1 , this is great value , but I would always use a neon tester for ( UK , 230 Volt ) mains .... the LCD uses the alternating supply as it's protective clock frequency ( normally a 30 hertz square wave in most other pricey equipment ) .... LCD's work also on DC , but prolonged use on DC strips the transparent tin layer off the glass , this will shorten this testers life ... but ... hey it's an excuse to head off down to Poundland™ and buy another ( + lots of other bits ... the little green cable ties are good value , garden shelf , wiring looms don't mind a different colour ( Ha - Ha ) ................
@svenboske844
@svenboske844 Жыл бұрын
Wow, it seems this Things havent changed much in the last 30 or so Years. Except mine has a detachable Clip, and is not so easy to open.
@ekhalilov5543
@ekhalilov5543 Жыл бұрын
@joerod7526
@joerod7526 Жыл бұрын
3:57 " one moment please "
@stephendavis6894
@stephendavis6894 Жыл бұрын
I bought one of these in 1990 for £1.50 and have used it a lot as a quick check. Went to use it a couple of weeks ago and there it was - gone!
@dantronics1682
@dantronics1682 Жыл бұрын
if you do a direct voltage reading on 12v battery it will start working again
@stephendavis6894
@stephendavis6894 Жыл бұрын
@@dantronics1682 I meant that it has vanished, not in any of my toolboxes and certainly not where it should have been. Didn't have my multimeter either but managed to complete the job without burning the house down.
@frankowalker4662
@frankowalker4662 Жыл бұрын
They've come a long way from a neon in a screwdriver. :)
@deepblueskyshine
@deepblueskyshine Жыл бұрын
They've cheapen the product, but meawhile they've increased the price. Some 20 years ago when these chinese testers appeared they cost the equivalent of 50cents to a dollar (at least in my country - Bulgaria and were several times cheaper than a neon bulb live wire tester) and worked in a logical way - only the detected level appeared on the LCD display. I guess there were some simple logic COG capable of working from a tiny charge on earlier models, but no more.
@ruben_balea
@ruben_balea Жыл бұрын
That model showing only the closest voltage was also available in Spain, at least in the Chinese bazaar nearest to my house, they had them for €0.60 while their classic neon screwdriver was €0.99 A genuine Wiha type 255-3 made in Germany was at least €3.50 at hardware stores but there were also clones for half the price.
@deepblueskyshine
@deepblueskyshine Жыл бұрын
@@ruben_balea Nowadays in the cheapshop near me there is nothing under a euro.
@ruben_balea
@ruben_balea Жыл бұрын
@@deepblueskyshine Here Chinese bazaars must be the only ones that have a lot of things for 1 euro or less, mainly because they seem to have thousands of things for sale so they can have a few hundred things for less than 1 euro because those really don't have much value. Then the rest depends, it can be cheap and bad, cheap and acceptable, on rare occasions cheap and quite good... and the same happens with more expensive products. I still bought a pot lid knob for 1 euro a couple of days ago, best quality stainless steel ;-) the steel is actually pretty decent and doesn't rust, but the screw they come with is aluminum and I swapped it out for a stainless steel one. I had already bought those more times, to replace the hard plastic bakelite-style ones when they crack. Then the classic shops "everything for €1" really don't have almost anything at €1 but rather at €2 or 2.50 and in the end they sell practically the same products as the Chinese bazaars.
@Namenloser_
@Namenloser_ Жыл бұрын
Oh great the Pen of Death is finally digital.
@oussamalasfer4860
@oussamalasfer4860 Жыл бұрын
i had red one when i was kid lol
@eak125
@eak125 Жыл бұрын
Of course Clive travels with a spudger...
@StephenFasciani
@StephenFasciani Жыл бұрын
I find it funny how right on it it says AC only, but he tested it with a DC thing
@hughaskew6550
@hughaskew6550 Жыл бұрын
The resistance values don't seem to correspond to the voltage scale...
@S.park.y
@S.park.y Жыл бұрын
I wouldn’t ever test anything greater than 12v with these things. I’ve been bitten before, once bitten twice shy
@randycarter2001
@randycarter2001 Жыл бұрын
It uses you as an antenna.
@SaltyPuglord
@SaltyPuglord Жыл бұрын
And a capacitor as well!
@WilliamWallace14051
@WilliamWallace14051 Жыл бұрын
36 Volts for golf carts and GE Elec Trak lawn mowers.
@renelaizer6518
@renelaizer6518 Жыл бұрын
Induction?
@phonotical
@phonotical Жыл бұрын
Anything that tests if the power is on or not and uses you to pass current through, just no If water got in, could the tracks wear down
@chrisw1462
@chrisw1462 Жыл бұрын
Hmm.. Metallic buttons on a voltage tester... "Just touch the buttons to find out if there's voltage in the circuit!" Yeah, I bet!.
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