What is the least shitty shit store? Never had a good experience with any of the shops such as, wish, aliexpress and the rest of em. But which one of them is considered the better one, or more likely to actually arrive with the correct item? Is etsy considered better than the rest? Are there any of these “low priced” stores...
I got these TP4056 modules from an AliExpress vendor and fail to understand how the protection circuit works or if it’s just typical Ali shovelware. It could be my limited understanding of electronics....
Yes that I found as well but have/had trouble understanding why it would be built like this. Also why a MOSFET would be designed internally like this. If you want more power capability you’d get a bigger MOSFET rather than two tiny ones in parallel right?
It’s related to the internal body diode of the N channel mosfet, so two of them are in series but reversed. When one MOSFET is activated, current may flow easily in one direction but be reduced by the body diode of the other. When both are activated, current may flow easily in either direction.
It seems they don’t really prevent discharging or charging separately due to the body diodes but they can cut off the battery alltogether.
Yeah true. I went through the arch process to learn about Linux though so it was worth it in the end but I still have no clue about selinux, apparmor etc that are shipped by default in other distros. Also the need for firewalls/antivirus which isn’t really an issue in Linux but still.
Does anyone recognise these power supplies? They’re cheap AliExpress led drivers and I want to change its output voltage to around 22V from 12V. I’ve read that the way to do this is to adjust the REF voltage on the IC that controls it. It’s a KA3845 but I don’t understand where that reference voltage is regulated. One...
Replying to myself for informational reason. Modifying voltage was more or less successful. Both optocouplers transmit a reference voltage, so both need to be adjusted simultaneously.
This can be done by changing the value of R19, a 23.2k smd resistor close to the output terminals.
I’ve attached a 10k pot with a 10k and 6.8k resistor in series and successfully modified the voltage down to 22.5.
The power supply itself is a piece of crap though. It claims to handle 400W but anything over 150W causes the short circuit protection to activate, never mind overheating at 150W very quickly.
Thanks. I ordered the 24V model in hopes of adjusting it down to 22V. I will use that to keep a 7s Li-Ion battery at a minimum charge level whereas a solar panel array may increase that voltage higher. It looks like the 24V model’s capacitors need to be changed as well since they can’t handle the Li-Ion batterys’ max charge voltage.
Well there certainly is some regulation because attaching a load does not decrease the voltage by much. Increasing the voltage is indeed ambitious for the 12V model but lowering the voltage of the 12V model seems doable.
I have a 3D printer and have a special filter that has two 24V blower fans that are connected in parallel. Unfortunately my printer doesn’t have the proper connectors for the fans. So if I purchase something like this power jack adapter I know the adapter is 12V not sure if that would make a difference. Anyway if I connect the...
Yeah don’t worry about it. Running a fan at a lower voltage than it’s meant for will result in slower fan speeds and a longer lifetime. Compared to the wattage an actual laptop will draw this is absolutely nothing. I power my soldering iron with an old laptop charger without issues.
Those plugs are generally used in 12V systems but they can handle higher voltages too. It’s the current you need to be mindful of for the most part, they can overheat if you try to power a space heater or something from that but a few fans won’t cause any issues.
Hi, I have built a microvawe transformer spotwelder, I have put a single turn of welder wire for in the secondary and I’m timing it with arduino. Worth mentioning it was/is a 230V transformer. Electrodes are sharpened copper rods. I believe the voltage is still high. The spotwelds it produces are slightly discolored and not as...
I just came across this and thought I’d share. I’ve struggled to get headers and IC’s off boards after soldering them on backwards/upside down. This video shows a cool trick with a piece of copper wire that makes them very easy and quick to get off without expensive tooling. I was thoroughly impressed. Hope someone else...
Pretty basic question but I am struggling to find the words to get the correct search result. The soldering iron I bought came with very narrow tips that I think are supposed to be used for circuit boards and components....
With soldering you want to maximize heat transfer at all times so flat surfaces (chisel tip for example) are usually ideal. If you want to remove solder from a hole in a PCB you’re better off with a round tip as that has the most contact area then. It will make it easier to use a solder sucker in that case for example. Personally I have the chisel tip on 90% of the time and might be willing to switch to the large flat one.
Wattage does not mean how hot it gets, it means how fast it gets to the desired temperature. Also Chinese vendors tend to exaggerate greatly with specifications, especially with cheap products.
How many Star Trek fans will see red because they don't see red? (lemmy.world)
What is the least shit online store of the shitty ones? such as: Wish, AliExpress, etc..
What is the least shitty shit store? Never had a good experience with any of the shops such as, wish, aliexpress and the rest of em. But which one of them is considered the better one, or more likely to actually arrive with the correct item? Is etsy considered better than the rest? Are there any of these “low priced” stores...
TP4056 useless protection circuit? (discuss.tchncs.de)
I got these TP4056 modules from an AliExpress vendor and fail to understand how the protection circuit works or if it’s just typical Ali shovelware. It could be my limited understanding of electronics....
What is a nifty little feature modern gadgets have lost? (lemmy.world)
For me it’s the notification light you used to find on older phones, was particularly good to know if your phone was charged without picking it up
Linux mint = best beginner distro (lemmy.ml)
Adjusting SMPS output voltage (discuss.tchncs.de)
Does anyone recognise these power supplies? They’re cheap AliExpress led drivers and I want to change its output voltage to around 22V from 12V. I’ve read that the way to do this is to adjust the REF voltage on the IC that controls it. It’s a KA3845 but I don’t understand where that reference voltage is regulated. One...
Because it's almost time (feddit.nl)
Merry KREE-mas everyone.
Is it safe to use a laptop charger to power two parallel 24v fans?
I have a 3D printer and have a special filter that has two 24V blower fans that are connected in parallel. Unfortunately my printer doesn’t have the proper connectors for the fans. So if I purchase something like this power jack adapter I know the adapter is 12V not sure if that would make a difference. Anyway if I connect the...
Tech workers - what did your IT Security team do that made your life hell and had no practical benefit?
One chestnut from my history in lottery game development:...
Microvawe transformer spotwelder. Is there a way to improve it?
Hi, I have built a microvawe transformer spotwelder, I have put a single turn of welder wire for in the secondary and I’m timing it with arduino. Worth mentioning it was/is a 230V transformer. Electrodes are sharpened copper rods. I believe the voltage is still high. The spotwelds it produces are slightly discolored and not as...
Huzzah! (slrpnk.net)
deleted_by_author
PSA To people watching YouTube with AdBlockers
You might have noticed that even on Firefox (depending on your lists) YouTube may detect uBlock Origin on Firefox now...
Vegan food: The west vs India (lemmy.ml)
Neat trick for desoldering many-pin components (youtu.be)
I just came across this and thought I’d share. I’ve struggled to get headers and IC’s off boards after soldering them on backwards/upside down. This video shows a cool trick with a piece of copper wire that makes them very easy and quick to get off without expensive tooling. I was thoroughly impressed. Hope someone else...
Attempting to repair controller, Have I damaged it beyond repair?
Hey all, have I damaged this xbox 360 controller circuit board beyond repair?...
What tip should I be using to solder wires together?
Pretty basic question but I am struggling to find the words to get the correct search result. The soldering iron I bought came with very narrow tips that I think are supposed to be used for circuit boards and components....