I know what you're thinking. Been there, done that for years but the Raspberry Pi OS configurator really does make it very simple. If in doubt, just pick the correct machine type and a basic Raspberry Pi Linux and click on the Next buttons. Any extra configuration will be done with the wizard which ...

I think that you're expecting things to be more complicated than they are and am then getting confused as to why it's not asking you awkward questions and looking for complexity and tying yourself up in knots. They've taken a lot of effort to make it almost foolproof and simple. In that last screen ...

SPF, DMARC and DKIM only verify that the server sending the e-mail is the who they say they are in the DNS and that the e-mail hasn't been modified. All these things can be easily set-up automatically by spam bot networks so that the bot machines pass all these tests. The spam bot controllers merely...

In the last week or so the right-hand speaker on my MacBook Pro 15" Unibody blew. So I bought a replacement on-line and tried fitting it this morning. All went well until I tried unplugging the speaker cable from the motherboard. The iFixIt site says to use a pludger to lift the connector strai...

The Mac Portable regulated power supply unit is complete. I designed and printed a box for the electronics (everything hot glued) and it all tests good. IMG_3674.jpeg The built-in ammeter is useful as it shows when the system is charging the battery and when it reduces the CPU clock too. When suspen...

Yay! As I suspected!

Shorted to ground as in internal failure?

How far onto the board is the power getting now?

As it's a Pi 4 you'll need a heatsink on the CPU and chipset chips with some sort of fan.

I put together the regulation circuit and tried it out... IMG_3673.jpeg The unit's voltage regulation is completely pants but I've managed to at least limit the maximum voltage. When first plugged into the Mac Portable the voltage drops to below 7V for a time, which is actually fine as the Mac Pro c...