Post contributed by Dylan:
I recently went away for Christmas holidays and caught up with some old friends. One of my friends had recently acquired a second hand electric skateboard but was having problems charging it. I offered to take a look and in process of doing accidentally put 40V across a couple of electrodes I shouldn’t have, this blew up a component on the board immediately and I sought to figure out what it was.
I couldn’t easily read the remaining markings on the package that hadn’t been melted off but knew is was a 6 pin package, had a D notation on the silkscreen (presumably for diode) and ‘KL’ marking at the least melted end. Luckily there was 3 others like this on the board, they were symmetrical components that all had the marking KL6C8.
I googled KL6C8, diode, semiconductor, array, pcb component to no avail so turned to EEVBlog Forum for help. Within a day someone had replied with the datasheet for the component I was searching for, after thanking them I asked how they found it and got linked to a very useful website smdmark.com where one can look find a component by searching it’s markings.
Today at makerspace: we applied knowledge of sizing resistors for limiting current through LEDs, to reduce the brightness of this fancy nightlight! It was far too bright initially, but the hot air station at makerspace made it easy to remove the original current limiting resistor (R5 in the photo below), which was replaced with a higher-valued one. Thankfully, the case of the nightlight is held together with screws, so it all went back together easily and is now working better than new!
The first I heard of 3D printing machines was in the mid-90’s; I remember hearing of things described as “Santa Claus Machines” (perhaps this old Wired article https://www.wired.com/1994/05/santa-claus-machine/ had something to do with the name) which used computer-controlled UV light to harden a special resin. Dad bought a little bit of the resin, which I remember hearing was hideously expensive, and we had grand plans for making things with it, but we still haven’t got around to finishing the required CO2 laser’s power supply…
Fortunately, here in The Future, we can easily and inexpensively get UV lasers with power supplies, or even simple UV LEDs (remember, when that Wired article was written, blue LEDs were still a year or two away from Digikey’s phonebook-thin pages). The resin is still fairly expensive at ~$150NZD/L, so you’ll not want to be asking Santa for anything too big, but it’s approachable.
Of course, now everyone and their uncle has an FDM-type 3D printer, so dealing with the expensive resin and UV light isn’t so appealing anyways…
Except! SLA printers work really really well, and you can pay someone else to do the printing for you. Not even very much money – our friends at Dangerous Prototypes sent me the part at the top of this post (along with some circuit boards) for $3USD, and look at the quality!
The VCW Web server has been replaced with a new one that’s more modern, more powerful, more efficient, and pretty much more of everything except big!
Tonight, Steve was hard at work on building out the weaving studio in the garage area. It’s great to have the concrete floors available for this sort of work, for obvious reasons:
We gained a new tool in our computer toolkit: a USB-to-IDE/SATA hard drive adapter. This is something I bought for consolidating data off a pile of hard drives from several generations of old computers. It worked great for that job, but now that it’s done I don’t need it anymore – free to borrow or use it at makerspace.
Slightly less visibly – we’re a bit closer to having a new web server, which should be considerably quicker, quieter, more reliable, and more power efficient. Current plans are to provide it with battery backup via a Toyota-makerspace collaboration, perhaps with solar power at some stage! More details to come.
One of the perks of Makerspace membership is access to the 4-post car hoist at the VCW.
I just wanted to share a recent success story from this afternoon: a WoF revealed that my car needed a couple suspension bushings replaced – the shop doing the WoF quoted about $110 to do the job, parts included. As car repair jobs go, I think that was a reasonable estimate. But, I was able to get OEM parts for well under half that amount, and – using the hoist – easily do the job in about 45 minutes this afternoon including cleanup!
Apologies for the low quality photo – just wanted to share some progress with the Pact scoreboard over the last few weeks. The PCBs are mostly assembled, the board itself is mostly ready. Next up: buttons and Arduino firmware!
It was a quiet Saturday this weekend, unless you were either a Jaffa rolling down Baldwin St, or the new 3D printer. We’ve been requested to make a hundred or so of these Grommets for the Loom Room:They’re used like this, in table-top looms: