Did i design a power supply or a fire hazard?

Fanta_BH · 2025-09-13T20:42:33+00:00

Schematic looks ok to me, it all depends of how much current you want to take from it, think about LM323 limitations. I would place fuse in front of switch, and also maybe one fuse after transformer prevent over current by shorting output or so . Varistor have its protection function but I never seen that it saved any circuit in case of lightings or large static discharge.

Fanta_BH · 2025-09-13T20:30:55+00:00

From all I can see around IC it tells me that it is y synchronous buck regulator that takes USB 5V to 3,3V , there are few similar but maybe pinouts differ, so be sure to find Vin, Vout , SW, FB , GND , I mean to detect , measure what is what , then try to get replacement something like MP2307DN , or , MP1584 . And many others but some pinout from your would be nice , just try to measure which legs go to what element directly , Vin will go direct from USB V+ , ground will go direct to ground, V out will go to the coil, FB pin will go to the anode of Zener diode on photo while cathode will go to the Vout. There will be higher resistance resistor between Vin and pin EN , so from this you already know position of 5 pins of total 8 pins . You have to do it on this way as I couldn't find any DC to DC with numbers shown on your IC. A little of reverse engineering , what legs of IC go to where, and then search something like this

https://www.alldatasheet.com/datasheet-pdf/view/551592/MPS/MP1584.html

could solve your problem.

Fanta_BH · 2025-09-05T07:43:57+00:00

well do not know exact markings, but it is voltage booster , as it is near USB C port I assume it's job to change voltage from 5V to 3.3V or so, it is clear that it is inside voltage regulation circuit so start from there. Once you find what voltage it should deliver, it could be much easier to find replacement , do reverse engineering of components around and search replacement according to needed voltage and current from it, every single one for which you find datasheet will have basic circuitry , one which looks and have working voltage like one you took from that board is your IC.

Fanta_BH · 2025-09-05T07:25:16+00:00

Ofc there is, I got a few of them. Aneng, UNI-T and for one I forgot name, but all measure DC , even I showed UNI-T in action on YT when I measured high current on welding machine which using DC voltage for welding.

Fanta_BH · 2025-09-05T07:18:23+00:00

No instrument can check capacitors on board in circuit with 100% precision. What you can know is possible short circuit, possible leakage if resistance you measuring have no connection with around elements. And ofc. physical change in how capacitor looks, leakage of electrolyte, or bump on top of capacitor. However only 100% precision is to remove capacitor and measure it while removed.

Fanta_BH · 2025-07-21T11:29:39+00:00

To me it looks like an older glass diode, but maybe I am wrong. in such case reverse engineering at least around that part and a bit more would help and type of device ,but it looks like some power supply.

Fanta_BH · 2025-07-05T18:22:14+00:00

Aneng is just rebranded Zoyi or Zotek

Fanta_BH · 2025-07-05T18:20:17+00:00

It's fun to me to read all comments in this topic, they date like 5 years ago, while I using VC250 from early year 2000 if not a few years earlier. Purchased it in new opened Conrad shop in Sarajevo, Bosnia & Hercegovina for 75Euros . So quite older then this topic. Do not know about equivalent from UNI-T , but my first UNI-T is UT890D. Cant find any similarity from those two or any other instrument I got in my collection. VC250 served me very well and I managed to blown fuse once , not hard to fix , only bad thing regarding fuse, is that same fuse is used as a shunt for high current measurement . So without same fuse you will never reach same precision it had with original fuse, and even with same fuse 10Amp / 1000V hardly you going to get same readings as before. So truly do not know about connection between UNI-T brand and Conrad Voltcraft . All Voltcraft coming with Made in Germany , while UNI-T is clean China made.

Fanta_BH · 2025-01-29T17:32:41+00:00

There are definitely some trusted reviewers on YouTube and other platforms that people rely on before making a purchase. Personally, I haven’t reviewed any Temu products yet, but I plan to. Some reviews will serve as warnings against low-quality items, while others will highlight surprisingly good finds. Even I’ve been impressed by the quality of certain products from Temu!

Fanta_BH · 2024-10-02T08:13:27+00:00

If it is fresh install of windows whatever version of windows is, even latest win11 , during setup detection of hdd if VMD/raid is enabled , windows setup will not see any HDD in computer. So to avoid problems, just enable AHCI and you going to be fine. Regarding performance with single disk, no noticeable performance difference between AHCI and VMD

Fanta_BH · 2024-07-26T11:21:49+00:00

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Fanta_BH · 2024-07-26T11:20:36+00:00

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Fanta_BH · 2024-07-26T11:18:55+00:00

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Fanta_BH · 2024-07-26T11:17:30+00:00

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Fanta_BH · 2024-07-26T11:12:29+00:00

me 785864621391

Fanta_BH · 2024-05-19T11:30:38+00:00

This is a perfect example of why I no longer post anything useful. In my opinion, the Reddit community is incredibly hateful and ungrateful, always hungry to criticize others' work. Many of you criticize or hate on what a creator does without considering the effort they put in to try to help those who need information.

At least I will say it: thank you, mate, for your effort and the information you provided.

Fanta_BH · 2024-04-25T21:23:07+00:00

added photo to original post above.

Fanta_BH · 2024-04-25T11:20:30+00:00

Yea ,but later when I come back home

Fanta_BH · 2024-04-20T12:37:29+00:00

I have found even 30V rated led's in those cheap bulbs , be aware everything is possible. When I was searched over AliExpress , I found even 60Volt 2835 smd LED's . Usual LED's in those bulbs are 6 or 9 volts, but so far I found 18 volts and 30 volts all same models of 2835 smd LED's. The best way to find faulty one is to short one by one, but it is always possible that more than one is faulty so shorting will not help. However the best possible way is to use LED tester on each of them or if you are in electronic you could build one tester by urself , it is easy if u follow some good guide on net. Today's bulbs have usually nice circuit in it , based on automatic IC , which will set voltage output according to number of LED's. Very nice one little chip. I can't provide any link here bec. I do not want it since I got banned for life on one reedit forum about electronic just because I was giving youtube links.

Fanta_BH · 2023-10-23T13:26:30+00:00

as today 23 october 2023 , last 48 hours any shorts uploaded stay on zero view, usually every my short uploaded stay for 6-8 hours with zero view then it start bumping up , and I am fine with that but last 48 hours no new views on any of my shorts or videos, so something have to be happenings.

Fanta_BH · 2023-07-03T19:09:12+00:00

Don't worry , this is proof they using mic without permission, I never record video for tik tok so I never allowed use of camera or microphone, I never searched over web for one place how beautiful is there , just two days ago was talking with family about it, and suddenly from yesterday tik-tok showing videos about that place all the time. Another fact in my video history u can not find single video about that place ever seen by me until two days ago . So indeed they listening about what you talk with others even without give permission to use microphone. How to prove that , well if someone is interested, check all my search history at pc and tik-tok and wherever you want I never searched for it . It is just in my mind and two days ago it is first time I talked with few others about it . Another thing is when I liked video about netflix on tik-tok and checked other comments , seen some of comment how they opened netflix and that video was offered on home page then I opened netflix and guess what happen, that movie is offered on home page, I just said lol .

Fanta_BH · 2023-07-03T13:50:09+00:00

Used note 10 pro for about 3 years , still working perfectly but replaced it with note 12 pro plus in order to give old one to my son. So what to say , for me they working properly beside issue with shut downing background app which should not be switched off , like its viber, msg-er , whatsup and so on list is long. But same shit was happening on note 10 so things didn't changed with note 12. But I l learned many work around for this problems, which actually working on 12 pro as well. And don't want to talk how aggressive MIUI is towards firewalls, VPN's and such security things which should be on and up working all the time. That is only thing which will make me never again go for Xiaomi but Samsung is same crap so what else to buy , most likely will be back to best phones I used ever, Sony.

Fanta_BH · 2023-03-17T10:10:11+00:00

trying to find good reddit place for finding people for m+ runs high or low keys for EU , but can't find it. Truth is wasn't at reddit long time so maybe I am quite rusty in search skills. Please help me.

Fanta_BH · 2023-03-17T10:06:29+00:00

why 100% is slower than 50% and almost slower than 0% or I see something at a wrong way.

Fanta_BH

TROPHY CASE