Not the best of the designs, part 2

Powering the microcontroller

As you’ve noticed, the mu-controller requires a power supply somewhere in-between of 1.6 and 3.6 volts. This is where the challenge comes, because it’s no longer like on the chinese toys where you have a cheap-ass AMS1117 to step-down an USB port1, and now you’re actually required to understand the electronic part of programming.

Well, the problem with this is that I have no idea of what I’m doing.

Power supplies were part of my coursework, but linear ones, which are plain shit.

dogfuck.jpg

So, I’ve found out the easiest and cheapest option was to use a MC34063, which I did use.

mcpbrd.pngmcpschm.png

And this is supposed to be a mini-pluggable board with pins on both ends, after consulting the datasheet and this tool, however it turned out the voltage divider and the output capacitor weren’t actually outputting like expected, and the Multisim’s 14th edition simulation of this regulator is broken™2.

Additionally, I’ve changed some resistors about four times3, a capacitor4, had to tin like half of the board and add some pin legs in the soup because the copper tracks came out with the heat, and this is the result of it:

mcupowersupp1.jpgmcupowersupp2.jpg

And this’ the output of it:

mcupowersupp3.jpg

Powering on the microcontroller

It’s alive!

blink1.jpeg

Footnotes

  • ^1 ‘worst trade deal ever’
  • ^2 and this is why you shouldn’t pay for software

    the bias is about 0.2 V in the simulation

  • ^3 no, I know what you’re thinking, but even adjustable pots are for single use in fine-tuning amps
  • ^4 for which I would like to thank to Wurth for sampling it to me; it was part of an AC-DC power supply which I never really made because I’ve fucked up the trace width and the tracks simply blew up, along with a fuse and about 1 mm of my floor tile.