No SOS mode though 🤷🏻‍♂

Interesting that on the 'flipped' image, the component labels are readable! They must have anticipated that "Big Clive always flips photos of our circuit boards, let's make it easy for him!" ;-)

I remember back in the 70s my grandma had one of those brass touch lamps. It was so sensitive that a fly could land on the metal and turn it on, low medium then high. She'd get so mad she'd unplug it. After a few years she threw it away because it annoyed her. lol

Always wondered how the modern ones worked. IKEA had a display of touch dimmers and every touch pad gave quite a strong feeling of AC fuzzy voltage.

The 5 page data sheet of the chip manufacturer (TonTek) lists different values for 3 of the resistors, depending on line voltage. It also shows two 1N4148 diodes clipping the touchpad input. And other interesting information.

That Triac (97A6) is rated for a On-State RMS Current of 0.6 A, that would imply that in countries with 220 volts AC it could handle up to a 132 Watt load and in countries with 110 volts AC, half that so, 66 watts. (I was about to ask, how much of a load before it is overloaded, but I looked it up instead, and posted this in case anyone else was interested). Thanks Clive, great video as always.

Was that a Freudian slip I heard 13 minutes into the video expressing how good this product really is in terms of the interference it can potentially produce (pun intended)? Another good video from you Clive, thank you!

Zener diode, zeeener diode. Thanks Clive for the English & American pronunciations of this part. It drives me nuts hearing zeeener all the time!

Excellent job. I've played with these dimmers for years and never understood them. Thanks so much 🙏

I've always liked proximity sensor's. In 1961 for an 8th grade science fair project I built a vacuum tube version using a 2D21 thyratron tube (valve for those of you on the other side of the pond) from a Popular Electronics magazine article. The IC version using a Triac does not seem as exciting as the glow from a tube, but I admit much more practical.

Those things are hell on short wave and hf ham radio reception.

Loving the variety lately thank you :)

As far as items like this from eBay I fall along the lines of The Emperor's New Groove: No touchy! Nooooo touchy!

Nice looking thing we could do with adding a good "buzz" when the pad is touched a sort of Haptic feedback, but mains 🤣🤣 cheer Clive 2x👍 (not had a good data 💩for years😱🤣)

My parents had a touch lamp when I was growing up. From what I remember, it would only go bonkers after a power surge or when the power totally went out. At some point, the touch module died, and my father had rewired it with an inline dimmer on the line cord. Now I'm tempted to pick up one of these modules and convert it back into a touch lamp... Thanks again for another great video!

Great video. Thanks to this instructional video, I was able to successfully operate it with a voltage of 110V. If you use it with a voltage of 110V, you need to change the resistor R1(68K) to 20K/2W and the resistor R2(1.5M) to 2.2M.

Looks very hackable and useful thanks for bringing this to our attention Clive 😊

Clive needs to make a game show to see how quickly different people can reverse engineer a complicated circuit board. Also, you have gotten so close to one million subscribers! Would be cool to reach 1,000,000 at Christmas.

Shengyn the finest things come from there to bring excitement to your life and test homeowners policy’s

"There are no standards on eBay." That is one of the most truthful statements ever spoken. In a number of ways. LOL.

I use non contact capacitive touch dimmers, originally based on Atmel's Q-touch technology, to put dimmers or switches behind tiles. They have a range of about 10mm. Mains powered ceiling lights dimmed from the bath tub.. But in theory, you could also use those mini doppler radar/microwave detectors as light switches. First time i saw one was as a lift call "button' with two sensors behind solid marble, with leds glowing through the stone. Very stylish. A completely smooth flat surface as a switch. Just needs a sticker. 👍🏻😀🇬🇧

I had a lamp back in the days with touch dimmer I liked that lamp so much lol it's nice to have a new Video just before going to bed

I have one of these for my X-Mass tree. The trigger is a mettle snow flake that it looks like a decoration

That "data shit" lapsus made my mind deflect toward toilets and think about capacitive flush actuators for some reason... Guess it wouldn't beat those IR ones but on the upside you would probably get that "fuzzy" feeling in a different context and some people might like it !

What I would be worried about is if these were referenced directly to the mains!

The coupling capacitor must be Y1 safety rated. A 3kV capacitor is not good enough. A Y1 capacitor will be designed to fail open circuit, never shorted and withstand a 8kV spike. Fortunately it's easy to add your own.

Interesting chip that's been around for yonks, I found the Chinese datasheet that described 2 capacitors in the touch plate and another in English that showed 3 !...cheers.

Touch switch and mains voltage. That is an interesting combination.

I wbay'd one of these a few year years ago for a light project - and didn't quite trust it either - so had a look inside and noticed it had the rwo capacitors which allayed my fears somewhat ... But adding a series resistor is a good idea for a bit more isolation - I shall do that !

Best thing since sliced bread. No more fumbling when you are half asleep to find the switch, just touch any part of the lamp and it comes on. Brilliant.

since the touch works through the wire insulation you might as well have the touch wire fully isolated

Ebay, mains and touch! Sounds like a good time!

Some of the "branded" ones a few years ago (meant for control of ceiling lighting via a receiver circuit) used an entirely separate stand alone transmitter and seemed quite failure prone in my case unless installed in very little used areas.

What I really want to see is the touch/wireless dimmers which have no neutral connection. I understand how they extract their power - either by a very small current through filament lamps or by adding a capacitor across the lamp in the case of LED lamps. What I don't understand is how they derive the timing with no neutral as a reference.

Yes you can use capacitive switches through plastic and pla cases. I've used 1mm thick pla to reduce sensitivity.

I once had a bare copper wire tacked into a chair rail around my room hooked into one of these touch switches. It made turning on and off the bedroom lamp easier in the dark.

In older houses with bootleg grounding and often some 60V between neutral and earth, those touch dimmers might be fun...

very interesting ty Clive.

Nice video

I couldn't resist watching this video as soon as I saw the title; "eBay mains voltage touch dimmer"; it evoked morbid curiosity by dumping dopamine into my amygdala probably. Had it simply said "voltage touch dimmer", that would have been different in a less evocative way. It was the inclusion of "voltage mains" that made me recall movie images of lights dimming during electric chair executions....

I remember building a Kit for a touch dimmer years ago in the eighties it had a touch plate made from aluminium foil which was stuck to the back of a standard electrical blanking plate, so you never touched any metal it worked great until you let the kettle boil no auto switch off on the kettle back then, so you got a kitchen full of steam and the dimmer cycling from off to full brightness for a few hours!

Triacs are notoriously noisy on the Radio Bands. On the flip side, these lamps are sensitive to Radio Transmissions, by keying the transmitter, the lamps go through their Off Dim Bright ETC every time the TX is keyed. Seen it in a neighbours window. Naughty but fun. Some PIR sensors are also prone to a UHF transmitter nearby. I once visited a relative in my Camper Van. Every time I keyed the UHF TX, ALL the outside lights came on at once in the street. People going outside to look whos there....

I put a touch light switch in our lounge that dimmed about 40 years ago. Still working.

I bought some a while back,I just seen this so I opened it up my chip is a K101/2111tryed find Data sheet it's coming up as a photocoupler I'll keep looking 👍

Uh oh Clive you're Freudian slip is showing😁 most of these touch dimmers ARE $HIT, I used to work for an electrical contractor supply, we ordered a bulk box of touch dimmers I didn't noticed until later that there was a sheet with a wiring diagram with a note in BOLD TYPE, I wired one up for a customer plugged it in to test it as soon as I touched the lamp 💥BOOM, it blew the bottom cover off the lamp🤯the Chinese company had used the same wire colors but totally opposite, the note said unit will explode unless wired according to revised diagram, someone pu dekcuf at the factory and eh we'll just throw ONE sheet of paper in the box with a note on it, instead of fixing them, some of the chinesium products are dangerously amusing but you really have to be careful.

A long while ago I found a fancy cheapish touch dimming lamp on the side of the road in somebody's trash. I decided to disassemble it and i took the module out and stuck it into a plastic outlet box and attached the Touch line to the ground of a three prong outlet and a phone jack and crock cable. Wired up with a two prong cord and metal face plate. This let me touch the plate to turn the light on or crock cable that went to a strand of cat cable with a loop on the end which wrapped around the cord of a desk clip lamp that I had clipped to a bookcase. This let me tuck most of the wires out of The Way and I could touch a wire by the clip to activate or the face plate or I could plug a phone cable in with a little break out to route a wire around somewhere more convenient. After like 20 years the module finally died so I replaced it and it was far cheaper than I expected to just go down to the local hardware store. The best part is the outlet cover that I used was custom painted by my mom with a little Bugs Bunny figure on it and that's where it has lived since. Considering that most of the lamps in the US are two prong whether it's metal or plastic double insulated or not… Three prong ones supposedly exist I have never seen one in the wild. other than cable abrasion the only contact point is in the socket connections which is usually insulated with a cardboard insert that if in good condition is sufficient, and I have never scene one otherwise unless the whole lamp is soaked which you wouldn't want to use anyway at that point. I have not had any issues and I find this fairly safe knowing what it is and how it works. although now I'm thinking what's three prong metal and motorized that I could plug in in touch to control speed hmmmm.

thank you!

Simple and it works, pretty nice functionality too, but again, two 1n caps in series SHOULD be used in line with the sensor as a safety measure.

I still have my three 15 watt canadabra base bulb 'brass' touch lamp, bought at a flea market in 1992 or so. Still works fine, I haven't even had to pull it out and replace the assembly. Our last house, it would turn itself on during the night about once a week.

You can use it with the COB LEDs that use no filtering and smoothing and purely resistive current limiting for the LEDs. It will flicker horrible but there might still be applications where flicker doesn't matter.

Thanks Clive 👍🇮🇪💚🙏🏼

Actually bought 1 of these off of Wish for £1. They sent it in shrink wrap, instead of the pictured plastic casing. Installed it on a lamp, all the same, & it works. Didn't realise how unsafe they can be. May have to take another look at it now

I ordered 6 of these to play with. I forgot all about them until you did this video! I need to drink less and err play more? With electronics :p

Perfect for the bathroom lamp

A follow up video showing the resistor experiment (R3) would be nice.

I had a touch lamp as a kid. You could play with the ceiling fan in a different room and it would cause the lamp to turn on and off. On a totally different breaker even.

Bought a couple of these from Amazon one of our touch lamps had failed. Casing and conductor colours are identical to this one. PCB slightly different. Connected as per diagram and it worked a treat, however out of interest I tested between metal casing of the light fitting and a known earth and had 160v which seems rather alarming. I was going to retro fit one of these to a bathroom shaving light but no Way, in a special location! Compared this to the matching other lamp which still has the original circuitry and it had around 20v.

Worth mentioning that there should be 2 caps in series, but they only installed one. But initially touching the insulation had the same effect. It is of course stray capacitance in series with the 4kV capacitor. It may be worth setting it up so you only touch the insulation Edit. I commented before the end of the video 😂

I got given a faulty touch light by a neighbour to look at. It had that exact module inside, the touch ring was under the upstand threaded nut which clamped it to the base. The whole light was made of metal, and it wasn't earthed, so I decided it was too dangerous to repair and return to them, so they got it back faulty.

As a radio ham,I have a touch lamp and it does generate a large quantity of noise,also when I am transmitting the lamp turns on and of because the touch wire act as an Antenna,no amount of suppression seems to work.

Hi Clive. interesting and thanks for the warnings. Nice of you to mention us Radio Hams, would you be one , I wonder? Again thanks and keep them coming whatever the subject.

I normally use the non-dimmable version of this touch dimmer switch, for LED light bulbs. You Used to be able to buy these touch lamps in the UK, from the supermarket. I haven't seen them lately, maybe they're not compliant enough, due to the touching of the metal parts reference to Live. I have two, touch bedside table lamps. I replaced the dimming version of the modules, with simple on-off ones(from eBay, upgraded the triac for bigger ones) This makes it led compatible. I also added a resistor in series with the touch wire, for extra safety. In Europe you need to reverse the plug to get them to work, if the polarity of L & N is wrong.

Big Clive , you could do audio books ,you have a very soothing voice ...I like it ..

i got the exact same one to repair a lamp and tbh it looked a lot safer than the failed one i removed

As a Scotsman I always appreciate the datashit

The 'kick' from a lamp burnout frequently fries these. I've put three of them in a friend's lamp.

I'm going to try to find the on-off only version of this. Any sine wave chopping wipes out the lower part of the radio spectrum, as you mentioned, and the majority of the radio stations I listen to are on AM, so no dimmers or noisy SMPS allowed in the house !

I was debating on purchasing two for our bedroom side table light, but then I remembered I asked a Chinese seller about another item is it earthed and the reply was what is earth? So I don't think I will bother, I need to find an English electrical suppler to purchase two of them? Thanks for the video, it was most enlightening!

Thanks for that. I've made a few lamps using these and it's a bit of reassurance. My main worry is always the same as yours, did the manufacturer do what they say they did? There are so many variations of wire colour out there, I don't trust them not to have substituted something and I've had some where the "touch" wire is black and others where it's yellow and the black is the feed to the bulb. For this reason, I always try it out on the first go using a neon screwdriver to touch it with. Deliberately wiring a mains electrical device directly to a metal casing always feels wrong!

No spark, no fumes, no zap. Where is your spirit of Xmas Clive ? 🎅

There's a huge safety problem with this thing in that the circuit trace connected to the touch input almost certainly isn't sufficiently separated on the PCB from mains voltage traces. The 3kV capacitor should bridge an isolation boundary on the PCB.

I never thought of using a dimmer switch in series with Christmas lights. It could dramatically increase their lifetime. Especially useful, not that the tungsten lamps are getting harder and harder to find with each passing year.

I remember in the early 90's when I first saw a touch lamp. They were seemingly powered by magic.

As always an excellent video. Thanks for that very informative explanation on this device. If you ever come across one of those cheap LED globes that claim to have some sort of emergency functionality built in, in that they are supposed to stay on in the event of a power failure but still operate as a normal light bulb, it would be interesting to see a tear down on one of them. We are flooded with cheap Chinese ones her in South Africa🇿🇦, but very few of the brands actually work as intended and also just how safe are they? Thanks for sharing. Love the channel!!

We had a lamp that I assume had something smiilar for controlling it. I found it annoying, and was happy enough to pass that lamp along to another family member...

I was expecting it to be potted. Aluminium foil tape, for ducting, has vulcanized rubber adhesive. I use two layers, with the lower layer in contact with the "ring" (in this case). Added capacitance and shielding. ;)

Yess.. Let's take a look at the data-shit.. how often is it just like this ? 🤣..Again, great video , and always much fun !

I totally wouldn't trust my life to how good some random manufacturer was at isolating the touch pad, lol.

My bedside light is a touch sensitive one, it has a similar module to this inside it. I run a wire from the metal touch surface to the top of my headboard so I don't have to lean over to turn it on or off 😂 coz I'm lazy like that. Always wondered what was inside the module, but keep forgetting to take it apart and see how it works. I tried mine with led lamps to no avail.. Must need a load between 40 to 60W I'm assuming, which is well above a 3.5 to 5W led lamp. Great explanation as always Mr C 😎👍

It would be a lot more interesting if all the wires were the same color and they all came out of a single hole in the box.

I really enjoy your videos. I have a few lights I've acquired in my occupation. A cheap ever brite solar light and a Eshine 24in usb rechargeable led light that seems to be very high quality. I'm willing to send you two of each as my support of your channel. I would just like to know if there is an easy way to modify the solar lights to make them motion sensing only. Currently they stay on at low intensity and brighten when motion activated.

Next you should take a look at an eBay Turbo Encabulator. Been wondering if the pre-famulated amulite housing is a worthy upgrade.

Would be a really nice addon to these videos some oscilloscope measurement footages.

That was some real data sh*t......🤣. Thanks for the video Clive

Interesting!

"eBay mains voltage touch dimmer" Not having seen the video yet, I guess if you touch mains, your light will go dim, yes.

There actually appear to be a couple of different "datasheets" floating around the internet for this.. One (which most closely resembles this circuit) appears to actually just be a one-page "how to" article somebody wrote up. There is another one which looks like it may be an actual datasheet from the manufacturer, but interestingly that one shows a very different value for that clock resistor (330K instead of 620K) but still doesn't really explain the value at all (though it does say you should change it from 330K to 390K depending on whether you're using 50 or 60 Hz)...

it seems to me that I use to make those with a 555 timer a touch switch but just off and on

Reminds me of when Alec of Technology Connections made his go boom due to ambiguous wire colours, and his was sold in a store, dodgy stuff... :P

Places like continental Europe don't have polarized plugs. I don't think China does, either. I wonder, do they have different circuits in their touch lamps or just instructions that read "Troubleshooting - If it doesn't work, flip the plug around."

شكرا على محاضراتك المفيده وعلى المجهود الذي تبذله هل لديك فيديو حول servo stabilizer

Any suggestion as to what value inductor between the triac and the load? It’s very bad in my neighborhood having noise coming from high voltage lines, aging insulators and a half a mile from the ocean. Corona central on the 7 KV lines feeding the transformers in the neighborhood. Next to impossible to work certain bands any time of day.

Clive, do you reckon it may be possible the processor recognizes a change in the level of RF interference, and not a change of potential on the round sensor lug? Your hand setting it off on the insulated wire made me think so...

Excellent knowledge and I almost understood a lot of it and I can just about explain how the basic electronic components work. How did you gain your knowledge and have you ever been involved in expert witness stuff in court?

Would be even better for lamp life if it switched on during the sine wave zero crossing point and then off during the rising voltage peak.

Bought a wall switch/dimmer with a touch plate some 25+ years ago. Touch it and lights on or off depending on previous state. Touch and hold, dim/undim (is that a word?) from last setting and "direction". Really neat! Lost it when the landlord decided to "modernise" the building and I never found one like it since. Boo hoo!

Are metal table lamps which use these modules safe, the ones I got from Ikea show a double insulated symbol. The mains plug is a three pin type but the earth pin is plastic. Would the main earth leakage breaker protect one if the case became live. The connections to the control module in the base of the lamp is the same as shown in your video. i get the classic tingling sensation when touching the lamp. You have saved me on a number of occasions from doing risky things particularly with microwave transformers - thank you.

In my experience dimmers don't really work with LED lamps even the ones that say they are dimmable on the box. They dim down part way then stick at a brighter level that I want, or go completely dark. In the devices that go prematurely dark my guess is that the issue is that the led doesn't take enough current to keep the a triac latched. I haven't figured out what's going on when you can't get it to dim all the way to nearly off.

Ebay, mains voltage, and touch. Those are some words that should never go together.

I installed one of these in my room as a teenager that triggered by touching a large lead weight I had suspended by my headboard and during and intense thunder and electrical storm it turned on and scared the living shit of of me. I had been watching scary movies before bed. I almost had a data shit it scared me so bad.