Timon Profile picture
16 Oct, 17 tweets, 5 min read
Ok EEZ Bench Box 3 assembly thread is a go.
Feets are on
PCB also haz 🦶
Front panel on, gotta make sure that USB con and rotary encoder are properly poking through their holes.
AUX PSU
Rear panel
Ethernet dong
Ok something is not right, the AUX PSU stays off if the cable to the MCU board is plugged in. Its happy when removed 🤔
Problem found, @jmarcelino had the same issue. The IDC was crimped slightly offset on one side, shorting out all the conductors. Trimming and reseating fixed it and its now turning on!
2 holes not tapped but got a M3 tap so quick fix.
All done and running :)
The case could use some better grounding though, 50-60ohm to earth is quite high.
Some small early adopter issues but all in all an impeccable product @envox has put together :)
Especially at this price!
Assembly was very easy and straight forward outside of the cable issue and untapped holes. Servicing or modifying the unit will be very easy. Its just 4 screws to get access to the innards and very little isn't directly accessible from there.
Grounding seems to go through the power supply cases and through the top chassis to the rest of the metal part so it is very dependant on those 4 chassis screws how well grounded it is. After opening it up again it went up to ~130ohm
Will def. retro fit some more chassis gnd con.

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More from @timonsku

17 Oct
Lets play "Which part is cheaper?"
We have two 16-pin USB-C connectors. One costs ~20 cents and the other ~5 cents at QTY 100.

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Read 17 tweets
16 Oct
One of those weird German things that I think are not really well known outside of Europe is the fact that it is very normal that several bombs will be defused in you area, every year. It is so normal that we got a "Kampfmittelräumdienst", a public service to remove bombs. /1
Unlike many countries they have nothing to do with police or military. They are more like (and often working with or part of) the fire department.
WW2 was 80 years ago and we are not even close to having all the bombs removed, its being estimated that about 1/5th has been found
Around ~5500 bombs are being found every year in the whole of Germany. So the chance of you needing to evacuate your home because of a bomb being disposed very close to you is very high and might happen multiples times in your life here.
Read 5 tweets
15 Aug
I created a re-usable 3D printed mould to cast little plant pots from concrete. Here is what went well and what went wrong [Thread] Image
At first I designed it as a 2 part mould in @adskFusion360
You can see more about the initial design here:
The idea was simple, have a big hole on the bottom to pour the concrete in and a few smaller ones to let the air out. Uneven spots on the bottom wouldn't visible and its easy to sand. That was at least the idea. Image
Read 26 tweets
5 Jan
Inspired by watching @ruthgracewong talk again I thought it might be fun to take a look at the Fomu made by @xobs and @mithro and see what went into this seemingly simple tiny product. Please bare in mind I'm no expert at this, just the knowledge I picked up over time.
(Thread)
I will mostly look at the case for now, I think many of you are familiar with PCBA, though I think @xobs might have some interesting hard ships to share from that too.
For example that hard gold can be.. hard :)
The case is a single injection moulded piece of clear plastic and its a pretty nifty one!
Lets first look at these overhangs that hold the Fomu in place. These are normally not possible, if you think about it, so you gotta trick around a bit.
Read 23 tweets
23 Sep 19
All the stuff arrived today. Unfortunately there were issues with the display assembly plastic piece and the backplate.
They were printed in SLS, not exactly the best process for large flat things, so some warping is to be expected. (Thread)
There is also some shrinking which the manufacturer usually accounts for you by making your parts a bit larger.
This has completely failed with Weerg here, they made it so much larger that it is 2mm longer than it should be and the warping is enormous. So the parts are not usable
Again, really shitty part for SLS but it was the fastest option. In hindsight I should have let e-make mill those 2 pieces as well and only print the blocks and face plates.
The overcompensation is really the biggest issue, typical SLS warping would have flattened when fastened.
Read 14 tweets

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