Wow that is crazy; today I saw these kinds of voltage converters/ power supplies for the first time on amazon and promptly RUclips is recommending me a great video about them 😅.
Thanks for the contribution again. Just a few hints: For Isolation Tests usually you short all pins of the input side and all the pins of the output side. So you just get 2 connections and need only one single measurement without being in danger to damage your device e.g. at the output side. You can easily get rid of the copper of the proof board by using a hot soldering iron. I also have this HKL supplies but I prefer using an external power supply to keep mains out of my own unit. I typically buy some quality power supplies "for sale" (because of not having latest greening solutions) from Pollin. 5V for 2.50 EUR or 15V 1.66A router supply for 1.75 EUR. In the 15V case by adding an "mini adjustable 24V 3A 97.5%" (buzz words for eBay or ali, typically 0.50 EUR) DC/DC converter. Adding a barrel socket and you are done. 15 V is sometimes helpful e.g. using a longer supply cable or when powering other (sensor-)stuff with the same PSU. Simple, cheap and safe solution. Some of my ESPs are powered by my 24V homeline which is is driven by a 24V5A supply (also Pollin 7EUR) and connected to my APS UPS 700.
Thank you very much for the very detailed advice. I also usually use external power supplies, e.g. USB mobile phone power supplies (mains to 5V, 1A and fully meets all legal requirements in most/all countries) but for a current project I wanted to try an alternative and share my (lack of) experience . Even the perf boards are sitting unused for years in my box, because for prototypes I mostly use bread boards or order PCBs (not etching and drilling them myself anymore since they became so cheap).
I this in my project to power on my esp8266 .but the problem is Vin and Gnd have connections. Is that okay? Because when i want to test with multimeter there no 5v reading.
Hi! You mentioned in the video that the inverter is supplying a sinusoidal output but the product description on the Ali express link says its a 15Khz square wave output. Are you able to confirm? Thanks!
Wouldn't 1W be enough for ESP32? I am really struggling to find smallest possible power supply for ESP32. I tried capacitive dropper circuit, but it really is problematic, and almost impossible to do, because of wifi transmission current spikes. Adding bulky smoothing capacitor is kind of counter productive, and also increases startup time. Plus I would like to be able to drive few small leds, and a relay, so that adds complexity (I could use 24V relay, and use capacitive dropper to just power relay, with pretty small current, but again, that is separate components to think about, makes it impossible to use in both US and EU from one product, and removes galvanic isolation).
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Wow that is crazy; today I saw these kinds of voltage converters/ power supplies for the first time on amazon and promptly RUclips is recommending me a great video about them 😅.
Thanks for the contribution again.
Just a few hints:
For Isolation Tests usually you short all pins of the input side and all the pins of the output side. So you just get 2 connections and need only one single measurement without being in danger to damage your device e.g. at the output side.
You can easily get rid of the copper of the proof board by using a hot soldering iron.
I also have this HKL supplies but I prefer using an external power supply to keep mains out of my own unit. I typically buy some quality power supplies "for sale" (because of not having latest greening solutions) from Pollin. 5V for 2.50 EUR or 15V 1.66A router supply for 1.75 EUR. In the 15V case by adding an "mini adjustable 24V 3A 97.5%" (buzz words for eBay or ali, typically 0.50 EUR) DC/DC converter. Adding a barrel socket and you are done. 15 V is sometimes helpful e.g. using a longer supply cable or when powering other (sensor-)stuff with the same PSU.
Simple, cheap and safe solution.
Some of my ESPs are powered by my 24V homeline which is is driven by a 24V5A supply (also Pollin 7EUR) and connected to my APS UPS 700.
Thank you very much for the very detailed advice. I also usually use external power supplies, e.g. USB mobile phone power supplies (mains to 5V, 1A and fully meets all legal requirements in most/all countries) but for a current project I wanted to try an alternative and share my (lack of) experience . Even the perf boards are sitting unused for years in my box, because for prototypes I mostly use bread boards or order PCBs (not etching and drilling them myself anymore since they became so cheap).
Yes your excellent KiCAD skills make it easier for you to get good quality PCBs. Then the proto-boards are only needed for urgent Tasks.
Excellent video! It would have been very interesting to cut one of the modules apart to look inside...
Maybe also a test for RFI...
Hi, see maby this youtube video for disassembling ruclips.net/video/zrxekAJ_M1I/видео.html
I this in my project to power on my esp8266 .but the problem is Vin and Gnd have connections. Is that okay? Because when i want to test with multimeter there no 5v reading.
Hi!
You mentioned in the video that the inverter is supplying a sinusoidal output but the product description on the Ali express link says its a 15Khz square wave output. Are you able to confirm?
Thanks!
Wouldn't 1W be enough for ESP32? I am really struggling to find smallest possible power supply for ESP32. I tried capacitive dropper circuit, but it really is problematic, and almost impossible to do, because of wifi transmission current spikes. Adding bulky smoothing capacitor is kind of counter productive, and also increases startup time.
Plus I would like to be able to drive few small leds, and a relay, so that adds complexity (I could use 24V relay, and use capacitive dropper to just power relay, with pretty small current, but again, that is separate components to think about, makes it impossible to use in both US and EU from one product, and removes galvanic isolation).
thanks, it was interesting
Please can you add a link to the esp32 Dev board in the video?
Add a link in the description: www.aliexpress.com/wholesale?SearchText=esp32+development+board ... just use the seller of your choice and trust ...
Where you get the inverter module ?
Thanks, see the description. But you get what you pay for....
I only see links for esp32 and step down, not the inverter board
found it on ebay DC 12V to AC 110V 220V Inverter Boost Module Board Transformer
Here are the search on aliexpress www.aliexpress.com/wholesale?SortType=price_asc&SearchText=tl494+inverter+100w
Are there fake versions of these out there?
yes. Do you want some?