So I made this 3S Balance charger that uses three TP4056 modules and three 230VAC to 5V DC modules so that they can work together and charge eatch string of cells individually, this makes it so that every time you charge your battery you make sure that it will be balanced once fully charged and no cells can stop charging before they are fully charged like with a normal chargers. And the best part is this is scaleable to how many strings you want even a 100s1p pack. Every module have to have an personal galvanically isolated power source so if you don't have 5V power supplies you can use three phone adapters instead using the usb port. It's very important that the power supplies are isolated from eatch other, you can't use one power source for all three modules. I don't remember exactly why but if i am not mistaken the GND is chared by the input and output making it impossible to series connect the output if you parallel the input making a shortcurcuit.

I made a Power supply board to get more experience with ecad.

It connects directly to 230VAC main via the plug on the bottom left. The plugs on the right output 48/24/12/5/3.3/1.6V DC with a small webinterface via ESP32-S2 for switching and checking voltage and current.

PCB & schematic files are avalable here (Altium files): https://github.com/Timo-Hauser/POWERPANEL-HW

I will use the PCB in my Mini Rack with my Raspberry Pi inside.

I cheated a bit by stepping down the ac with a LRS-150-24 module so its DC-DC only.

I would love to get some feedback on the Schematics as well as the PCB layout.

I choose the parts mainly based on availability at JLCPCB and tried to avoid any tht parts.

I'm aware I could buy this premade for cheaper but it was fun so far.

Rail	Source	Rated
24 V	Mean Well LRS-150-24 brick, through a TPS16630 eFuse	2.5 A
48 V	LM5156H boost from the 24 V bus	1 A
12 V	LMR51450 buck	3 A
12 V fan	LMR51450 buck, feeds 4 × 4-pin PWM fan headers	3 A
5 V	LMR51450 buck, TPS2557 current-limited terminal switch	3 A
3V3	LMR51450 buck	2 A
1V6	buck from 5 V	1 A

Also for those that care I did work with AI on the project.

I just made my first handmade PCB. I drilled and cut the lanes my self. There is no short circuit and its little bit messy. If you have any advice maybe how i can do it beter i will take it.

I know i could make it with those fluid chemicals or whatever but my parents don't trust me with it.

Its a 5-35 to 5 V Circuit with a LED that indicates when the 5V pin gives out power.

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For most of my questions and debugs I used opus 5.5, I learned a lot from this project and can't wait to do more! It's been very fun :D

Spotwelded a 3s2p 40A Battery custom fit inside the old battery box that had completely different sort of battery cells than 18650, thats why I had to make the pack in a staircase type of way just to get the pack to fit inside the original batterybox, then I ran balance leads out from the box thru a connector that i can take apart so that I can unhook the charger that i made from the battery, the charger is a 3s balance charger that runs on 230VAC and always fully charges eatch string of cells so that the battery will never be unbalanced. Even at about 50% charge the drill has more power now than before with the new 40A pack. Cost me less than buying a new battery thats weaker and lasts a shorter time between charges than the one I made!

It smells exactly how you’d imagine

On a safety module.l took apart to take a look, i have no intention to put it back in production.

Dallas DS1225Y Battery 64K Nonvolatile SRAM X-Ray Images. They seem to have assembled this one with the battery on the bottom side. Hope this helps people be able to bodge in a battery and reuse these. It was hard to get the perfect angle.

I am running out of items to X-ray LOL.

Disassembled YIG microwave oscillator, a high-performance frequency source that uses a magnetically tuned yttrium iron garnet sphere to achieve exceptionally low phase noise and highly linear, wideband tuning across multi-octave microwave frequencies.

Photographed with macro lens and a camera, sample from our collection.

Hope you guys enjoy it! We couldn't find high-res images of the spheres online, so we decided to shoot them ourselves.

This is an LED blinkenlights type of thing, driven by 74HC14 Schmitt-trigger inverters driving the LEDs directly; and 74HC157 multiplexers to select different sequences.

It's my first time using such tiny components - the matrix area of the board needs to be clear of components but I needed to keep the rest of the board as small as possible while cramming in lots of capacitors and resistors.

I know some of you solder this stuff but I can't begin to imagine doing so so I left it to JLCPCB - OTOH I'm still an electronics novice so I'm impressed/amazed/astounded it worked!

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Oh dear

I'm a highschool student in Australia who's really interested in sound engineering and recently decided to start designing a custom IEMA (In ear monitor amplifier) as a cheap and opensource alternative to the Behringer P2.

For context, I do live sound at different gigs around where I live and I wanted a cheap and flexible wired IEM beltpack for when I perform that's not the Behringer P2 so I decided to make my own from scratch using analog circuits! I first built the PCB in Kicad and then modelled a case in fusion and then got my renders through blender!

All the design files are available here - https://github.com/aaravjhamb/openIEMA and I would love to answer any questions!

I didn't know about these things until recently.

I've found them to be the handiest things ever for doing test and measurement work because they convert any bare wire into a banana plug-able wire. So instead of connecting to a bare wire with an alligator clip and having an exposed connection, I clip one of these onto the wire and plug it directly into the banana port it needs to connect to - multimeter, signal generator, power supply, etc.

I also use these with banana plug to BNC converters on my oscilloscope. Obviously this isn't as good as a regular shielded oscilloscope probe for some applications but for others it is just fine. It's much better than having an exposed wire to probe connection in a lot of situations.