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From: The Natural Philosopher <tnp@invalid.invalid>
Newsgroups: comp.os.linux.misc
Subject: Re: News : ARM Trying to Buy AmperComputing
Date: Fri, 24 Jan 2025 11:21:23 +0000
Organization: A little, after lunch
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On 24/01/2025 01:57, rbowman wrote:
> On Thu, 23 Jan 2025 21:59:58 +0100, D wrote:
> 
>> I've seen some tutorials utilizing the GPIO pins. I imagine that that is
>> where it would come in handy to avoid a birds nest of cables and crappy
>> soldering.
> 
> I use solderless breadboards and Dupont wires when playing around. It's
> quick and dirty, emphasis on the dirty part. The preformed jumpers are
> neater but they're a bit of a PITA. I've seen videos of people pressing
> them in with no problems but that ain't me.
> 
> I haven't done a PCB in decades and never was very good at it but that was
> before software to help with the routing. There's still a lot of overhead
> for a DIY project.
> 
> https://www.instructables.com/DIY-PCB-using-Liquid-Photoresist/
> 
> That's the basic procedure I followed. For one-offs I used presensitized
> PCBs rather than spreading it on myself. For volume I'd make a silkscreen
> but then you're into a whole other art form. The artwork was tape and
> transfer symbols on mylar.
> 
> Then you move on to etching. I used ferric chloride which is fairly nasty
> stuff and tends to dye everything in sight yellow. Another choice was
> sodium persulfate. I never used HCL and hydrogen peroxide. That seems to
> have its fans.
> 
> Then if you finally wind up with a flawless PCB the fun begins, drilling a
> crap load of holes. A Dremel drill press helps. Depending on the board
> material, buy a lot of bits.
> 
> All that makes the online services look extremely attractive.
> 
> 
Indeed. I tried using the clever PCB routing stuff but in the end it 
took longer to key in all the relevant info than it did to do it the way 
I always used to. Pads and tape but done in simple 2D CAD. with layers 
for each of the board parts - legend, top mask, top copper, lower 
copper, lower mask...drill file.

I actually enjoy that a lot more than pissing around with chemicals. And 
drills.



-- 
“when things get difficult you just have to lie”

― Jean Claud Jüncker