The YX 8018 LED Booster oscillator Joule Thief Chip tested / conclusions
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- Опубліковано 12 вер 2024
- Please read the description first. The YX 8018 (Joule-Thief-Chip, often used in Garden lights with 1 LED and 1 rechargeable battery of 1,2 Volt, Ni-Cad or Ni-Mh) is tested here.
Correction: on 6.36 I say that “there is no inductor”, but that is (of course) not right…. Without the inductor the circuit cannot work, because it is an (analog, classical) L-C (C or so…) oscillator (!). And: 7 July 2024 = 9 July 2024, though I did many experiments during the past days. And on 2.16 I say "the frequency is driven up", but of course I mean: the voltage (!) is driven up at the output of the Chip, making it (out of 1.2 Volt) so high that a LED can burn.
Normally a LED cannot burn/light up on 1,2 Volts, its barrier voltage (to get a light effect) is namely much higher than 1.2 Volts. Barrier voltage also depends on the LED color = light frequency that is sent out by a LED.
I wanted to say: “both the solar panel and the rechargeable battery of 1.2 Volt were removed for this test setup”. So that we have this YX 8018 Oscillator Chip at its “bare” properties; only in this way we can do a serious test.
Everything is, furthermore, told in the video. Talking about the wiring, the oscillator frequency, the waveforms and “energy level out, to the LED” related to the supply voltage (0,6 Volt to 2,2 Volt) and more.
Important, regarding these 1.2 Volt Ni-Cad or Ni-Mh Solar Garden lamps: you can use a cell that can hold more charge, say 2 x as much.
When, in the original lamp, there was a 100 mA/Hour battery, you can use a 200 mA/Hour battery.
Your Garden Lamp can work longer during the night. But, of course: that depends on the amount of sunlight, the solar energy, that was strayed into the Solar panel during the day (!).
I even use 2000 mA/H good quality (Varta) Ni-Cads for this purpose. Of course it will be impossible to charge a Ni-Cad or Ni-Mh battery with such a high capacity via 4 tiny solar cells (showed in the video), during a (sunny) day. And, anyway, overall it works as long as all the Solar panel & Ni-Cad or Ni-Mh battery are healthy, thus not old or deteriorated.
The Ni-Cad or Ni-Mh (often 50 mA-100 mA) cells that are soldered into these cheap (Chinese) garden lights in general deteriorate within 1.5 Year.
Has also to do with the fact that these lights are not switched off during the dark season of the year, though there is a switch, + the fact that moisture corrodes these switches within (say) a few months of use.
NB: when you want to take the (say) 200 KC signal out of this oscillator chip for whatever kind of purpose: use an outcoupling capacitor in the order of 1 N-4N7 (even 10N), connected to the top of the inductor (say 470 uH), opposite to ground, Ground is pin 2 of this Chip.
Of course, like always with oscillators: do your experiments. There are always other possibilities/pins via which you can take the signal out. Find out how and where you can take that (say) 200 KC out, via a small value capacitor (1N-10N, experiment), opposite to the pins over which such a frequency is generated. Use your oscilloscope, without an oscilloscope such serious experiments are not possible.
Thanks for watching.
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This chip is new to me and very interesting. I liked that you experimented with different voltages, surprising results.
I agree. Also making a lantern with one 1.5 Volt carbon zinc or alkaline battery and a fierce LED.
It's like a mini joule thief circuit but in a chip form with a solar control circuit. Pretty neat. These are probably in many lawn solar light I would guess. Nice work
I would guess that you could tap the oscillation from the coil and drive a larger voltage through a second inductor with an external power transistor to run much higher power lights if you wanted to. You could probably take 5v and power 3 or more LEDs in series with such a setup. It's a very compact circuit so it could power a bright flashlight if done in this manner.
@@newmonengineering I've played around with these chips myself. Even in the circuit that he shows for 1.5V, you can just put two or three LEDs in series, and it works. Although the minimum operating voltage probably increases a bit, I didn't check that.
I have bought LED flashlights from China that work on a single 1.5V battery. Since white LEDs need a higher voltage than that, such a flashlight can only work with some kind of boost circuit.
@@keesvanreeuwijk7467 Good idea to use it for a lantern.
@@newmonengineering Yes, there are a lot of possibilities. Thanks.
I have played with these circuits also. I'm told that this chip has an internal oscillator not based on the inductor and has a MOSFET output transistor.
Nice work. Install the solar cell. When charging, (day light) the LED should be off. When not charging, (night) the LED should be on. 🍻
Thanks Barry, I tested it and it worked that way.
Very interesting, thanks for sharing thumbs 👍