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Every connector under the sun is here. Plus it has IC interconnects so this post is technically not breaking the rules :)

Thanks Davide for this great resource!

This is a quick prototype HV DC buck board I built using the fiber-laser PCB process I posted earlier.

Still experimenting with trace limits and thermal performance, but it's working surprisingly well so far.

This is V2 of my e-ink DAP project, it has :

• a high quality TI DAC (TAD5212)
• physical controls with a physical wheel (with a hall effect sensor)
• a haptic motor
• 24h battery (even more if I put a larger battery in it)
• BLE audio
• a small 41x73x14mm form factor.
• the nRF53 as its main MCU
• microSD slot

V1 horribly failed, here is what changed since then:

• No more Wi-Fi, this is a bummer, I plan to add this back in V3
• Way longer battery life, V1 used a much more power hungry chip
• Different DAC, it's better in some sense, and worse in others, but not hearable to the human ear

The firmware is still in very early stages, I still haven't implemented a ton of features that the hardware is capable of, like DSP, Bluetooth, etc.

I also need 3D print the case in resin, so it doesn't look like this, I want to use transparent resin

The whole project is open source: GitHub
And the whole process was journaled and documented from beginning to end: V1 journal, V2 journal

Every time i want to do an experiment in the lab and use USB power to my DUT i need to find a cabler with correct connector and thick wires enough for the purpose and then cut it :(:( to be able to connect it to my bench power supply.

So finally i decided to solve this reoccurring issue with a universal adaptor that will solve all my challenges and stopping me cutting cable after cable.

This led up to designing the small adaptor that fits most power boxes since it has moveable banana binding posts. I have added polarity protection and over voltage protection that can be disabled to make it flexible and pass thru voltages from 3-20V out to the USB-A and USB-C connector.

I have also added charging negotiation circuits for both USB-A (up to 10W @ 5V) and USB-C (up to 15W@ 5V).

The adaptor can handle up to 6A so it will work for most application!! I have worked a lot with heat managment and tried to keep low resistance in the current paths. When loading max the hottest component reaches around 85 degrees C in room temp