Double QX5252 - Perpetual Light?
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- čas přidán 12. 09. 2024
- Each week I will grab a random electronic component from the vault and build a circuit - this week I follow through on a crazy idea to use two QX5252 chips to generate a stable voltage all day and all night - and it works!
More info at onecircuit.blo...
www.tindie.com...
That is some awesome work and great thought process
I like this QX5252 upscaling and also look forward to see your uses, including the Attiny. Good thinking!
That is a brilliant idea to get the circuit lighting 24/7
Thanks! 👍😀
A bit late, but if you want the 5252 running 24/7 just charge the battery directly via a shottky diode, not thru the chip.
If you use a second chip for charging you are basically just using it's internal diode, the rest of the chip is unnecessary and might even be wasting a bit of energy.
Yes it was a silly idea, I now use the SOT-23 version which has an LS pin to allow 24/7 operation. 🤷🏻♂️
Cool. It could be used in a weather monitoring station in remote places.
I'm using an ATtiny 85 to run Xmas lights.
More circuits involving the 5252 please
I don’t think this obsession of mine with this little chip is going away in a hurry! 👍😀
@@onecircuit-as I've seen circuits made with more than one of these chips in the same one circuit but playing a different role in the circuit
It’s an interesting chip, that’s for sure!
cool, but are you really getting 5v out of it?.....if so, is that just because of the added 5.1 zener diode?.....just curious as ive been messing with this qz5252 too... interesting little chip. cheers,
It is a great chip and yes the zener is the key to the voltage - a 3.3V zener will see a stable 3.3V out of the QX5252 (who's output jumps around a bit at 44kHz-ish)
@@onecircuit-as excellent, i,ll try that then....ive had 2 warm white leds running on a 1.2v battery and solar charged, had it running solid for 16 hours...and only used 0.175v amazing....so ill try the zener. Cheers matey... happy tinkering. :)
They run forever (even with Tasmanian "sunshine" powering them). The SOT23-5 version (available at LCSC) has the ability to run all day when you ground the LS pin - it works a treat.
@@onecircuit-as excellent, i just found some of those on aliexpress.....thanks for the heads up, i,ll take a look at the datasheet....cheers man, all the best from UK...and wet n windy grey skies ;)
Nice idea. I was looking for something like that for a Votive candle. I have some questions. I have looked at the poor datasheet of it but I haven't understood what is its output voltage Vbat. Is it the same of the solar panel Vsbat? It is important to know that in order not to damage the batteries. In your circuit what is the purpose of the schottky diode (there is one inside the chip) and of the cap? Thanks
It is the same as the panel (I use 2V). The schottky half rectifies the output - see earlier video where I put an oscilloscope on the output. Any diode would help but the schottky has low forward voltage. 👍😀
@@onecircuit-as I see. So it's needed if you apply some IC as output. Apllying just an LED it's not needed then. What about the cap? Is it needed for the IC at the output?
Yes I only have those components to smooth the output for the Attiny uCs I use (which are fairly forgiving it seems). For LED output the eyes won't notice the flickering as from memory it's around 40kHz?
@@onecircuit-as ok, cool. I'll do a video after my prototipe will work correctly for a couple of weeks. Cheers
This video (czcams.com/video/8qygw51U9YE/video.html) features the SOT23-5 version of the chip which is more useful for day/night usage.
Have you checked if your solution works flawlessy after 1 week? Mine doesn't work properly anymore. It can't charge the battery enough. I use 5 x 0.6V solar panels in series.
Yes it’s still chugging along on the window sill. The SOT23-5 version (just a single switchable QX5252) is even more efficient running four randomised LEDS night and day now for months. They both use 2V “160mA” solar cells. I have measured current in the Tassie sun at 100mA with a 20ohm resistor. I am interested to see how they go during the winter months. Let me know how you’re going with your version.
@@onecircuit-as which kind of battery do you use? I've used NiMH AA ones.
Same - just the cheap ones. I think maybe the current from your solar cells might be low? Have you measured it?
@@onecircuit-as I will measure it. I have 0.6V * 5 little solar panels. Is the total current the sum of the 6 ones like what happens with the voltages?
Wiring the solar cells in series increases voltage. Wiring them in parallel increases current. 👍😀
You have all the wrong values and have components you don't need.
...and yet it works! Actually later I shift to the smd version which allows to be on the whole time! 😳
@@onecircuit-as you could throw dried leaves on it too, and it would work, but they are not needed.
Depends on what is needed! In this case a stable output voltage for a microcontroller - the QX5252 oscillates at 40kHz and that can be problematic depending on the project. Also, I'll give the dried leaves a go - thanks! 😁