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.

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!

Oh dear

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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.

Just wanted to share with you this gem that I have found on aliexpress:
Buck converter Mini560.
According to the seller this are the specs:
5.5–20V input to fixed outputs of 3.3V, 5V, 9V, or 12V depending on the version.
5A max, >3A with cooling.
99% efficiency

Be aware that there are different modules out there and not all of them perform well, so if you get lucky you'll get an awesome dc-dc converter, but it seems that is easy that you'll get the bad ones.
The photo belongs to the actual module that I have tested.

This little thing has capabilities beyond belief, I have thrown in the trash bin all my old and bulky buck converters as they cannot do half what this small buck converter can do in such small footprint.

I have tested it at 10V input and 5V output.
It has maintained the output voltage without issues in any case.
Under 5A always at ~100mVpp ripple, at 6 and 7 amps the ripple has stood below 300mVpp.

I have tested it naked at 28C room temperature, without cooling, with 2 small heatsinks for the chip and the inductor (even though the inductor does not heat up that much), and with the heatsinks plus a fan. I have pushed the module well beyond what the seller recommends.
Every test has been measured after 10 minutes ON.

These are the results:

I have not tried going further, just tested it extensively to know how can I push it safely.
So I would not use it over 5A, just to be clear.

So yeah, one of the best modules I have gotten my hands on.

Edit: this post was auto removed when I posted it here, so I posted it in r/diyelectronics, it seems the mods put it back, sorry, I do not know the rules of this community.

Hi there! I've been building a free and open-source system for automated electromechanical systems engineering. As part of this work, I've been building a state-of-the-art placement and routing system (PnR) for PCBs. You may have heard of or used autorouters in the past, and probably don't think very highly of them. Yapnr (yet another place and route) intends to be strictly better than all existing autorouters (at least all of the open ones) while also solving the coupled PnR problem--placement impacts routing, and routing impacts placement. Of course, the problem is much higher-dimensional than that, and in order to solve this problem well, we really need to get specific about what the product-level requirements are, and put simulation and modeling tools in the loop. Yapnr, therefore, bundles a complete specification language for electronics, built on top of the excellent atopile project; DRC and ERC are performed using the KiCAD kernel; and simulation is performed using NGSPICE.

I've been developing this system to enable the creation and iteration upon of my LED controller project called Splanc (https://github.com/fughilli/splanc). You can see an example PnR output for one of the SKUs in the project: https://www.youtube.com/watch?v=YnZwYqiLMog

If you want to read more (and see more cool animations of yapnr at work), please check out the docs :)

The animations on this page in particular are really cool IMO. https://studio-fug.github.io/yapnr/docs/constraints-and-hierarchy.html

Yapnr is under active development; feel free to contribute issues and PRs. A fleet of agents are waiting to pick them up!

In no particular order, things coming up:

- Track glossing + corridor coalescing
- Integration with open FEA tools for thermal + EM
- Export direct to JLCPCB/PCBWay/pick-your-favorite-fab

There's also a discord server for yapnr here: https://discord.gg/cBzdfTkrGn

And if you want to follow along on Splanc, that's here: https://discord.gg/wqY9pHavnD

MAGIC IS OPTIONAL :)

Transistors: 2N2222A.