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This strip has a very smooth and even glow along its full length due to the use of a COB based strip with a diffuser in front.  It's ket down by being mains voltage with no smoothing, so it flickers a bit too much for comfort.

It also has a very inappropriate dimmer, which was interesting in its own right.

It is hackable though, and could be used with a little bit of custom circuitry to set a lower intensity with no flicker at all.  (Cap dropper with smoothing.)

I wonder if they do a 12 or 24V version.  It would be safer, with no flicker.

https://www.youtube.com/watch?v=Q19zDo0D1rE

Files

Flickery COB LED strip with terrible dimmer. (with schematics)

Interesting material, but suffers from the curse of these mains voltage LED strips, which is the flicker at 100 or 120Hz. Not visible when looking directly at it, but definitely visible in peripheral vision and on moving objects. One slight error in the video. I said I was testing a metre, but it was a half-metre (20") section that I tested as 8W. So 16W per metre. The dimmer is completely unsuited to sensible control of the LEDs, since they don't light until quite far into the sinewave and then snap on. The snubber network is perplexing. Almost as if they felt they had to use it, but kept increasing the resistor value because it would be making the LEDs glow visibly. 200K is way too high for a snubber. They would have been better just not using it. The use of the COB strip inside with densely packed LEDs gives a very linear glow. A nice use for this strip would be to combine it with a capacitive dropper with smoothing, for a low level flicker-free glow along the full length. For functional illumination I'd tend to recommend using low voltage DC strip for a smooth PWM dimmable illumination. It's more versatile due to being able to be cut in much smaller increments, and the low voltage supply is safer too. The high voltage strip has the advantage of lower current along very long runs, but I'd not want to use the clip-on friction connection for any significant load. If you enjoy these videos you can help support the channel with a dollar for coffee, cookies and random gadgets for disassembly at:- https://www.bigclive.com/coffee.htm This also keeps the channel independent of YouTube's algorithm quirks, allowing it to be a bit more dangerous and naughty. #ElectronicsCreators

Comments

John Lundgren ~ Acme Fixer

It seems to me that they could have used a smaller value pot and series resistor to get rid of the pot's dead zone where it does nothing as it's turned. Possibly it would be better to replace the dimmer circuit with a filter capacitor and a high-low switch with just a resistor. Thanks, Clive.

Mike Page

Quite dangerous. That box came apart without a screwdriver. That's a big no-no for a consumer product.

Curtis Hoffmann

"A very inappropriate dimmer". Caution: NSFW dimmers.

Charles

Opportunity for a short-short video - test that fuse and see at what current - and if - it actually opens, and whether it does so gracefully or not. With the rest of the careful attention to safety of this circuit, it might just be a tinned steel lead with a do-nothing plastic body molded onto it :)

David Reader

did you try to measure the fusible resistor? - it mau be the bands run the other way, so perhaps 22 ohm? that would make more sense maybe?

Gordo

Radio ham here.. Yep, hate the broad spectrum interference. It's interesting to get a cheap battery-operated MW/AM transistor radio (what we used to call a "tranny") and walk around the house identifying the sources of interference. Very similar looking lights can have very different emission characteristics. Our worst LED (30W tube replacement) can be heard across the entire AM band from 100m away..