Category Archives: Design

PCBWay: Educational 555 Board

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I got an email from one of the marketing people from PCBWay who said they could offer me free PCB printing services in exchange for a review of their service on my blog. I am very happy to do that!

Today I signed up for an account over here: https://www.pcbway.com/Member/Login/

The signup process was extremely painless: email address, password, terms of service, privacy policy, done.

(Note: I am not a lawyer, but I did read the ToS and privacy policy, and basically they claim the rights to your design files for various purposes and might transfer your data over an insecure network. I think these services are fine for hobbyists dealing with open hardware, but if you’re a commercial entity dealing with higher value intellectual property or larger volumes you might like to get legal advice before engaging.)

After logging in I got an email confirmation code emailed to me. I updated my account settings including my basic information and contact information so they know where to ship my PCBs. In exchange for my having filled out my full profile they gave me US$35 worth of vouchers with various terms (e.g. minimum spend).

I then used their shared project service to search for a 555 timer circuit that would meet my requirements. I found this one: Educational 555 Board.

I clicked “Add to cart” and accepted all the defaults (shown below) on my order for 5 PCBs. So far I am a happy customer! (Update: as part of our sponsorship deal PCBWay covered the shipping costs too! I was a bit worried they might ask me to cover the shipping, but they included it, which was super excellent, especially as the shipping was about five times as much as the boards themselves!)

I’m just getting started with PCB printing. I expect that in future I will do much more of it. I have been working my way through PCB design with KiCad – updated for KiCad 7 to learn how to design PCBs using KiCad. Apparently there is a PCBWay Plug-In for KiCad, so that might be something worth checking out.

When my PCBs from PCBWay arrive I will make a video of me putting together the 555 timer circuit and then using it to test my IC test probes. Stay tuned for that one!

Large Language Models and The End of Programming – CS50 Tech Talk with Dr. Matt Welsh

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Here’s an interesting talk about how we won’t need programmers very soon: Large Language Models and The End of Programming – CS50 Tech Talk with Dr. Matt Welsh.

If refers to the following books:

Netfilter and iptables

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This evening I read the iptables man page and Linux iptables Pocket Reference from cover-to-cover; my notes are here: Netfilter.

I think at this point I am ready to use iptables in anger for the first time in a long time, and the first time ever on a router.

However, before I take that on, I’m going to have a quick diversion into the following books, and then sleep, and I will do my iptables programming when I wake up tomorrow.