Jan 212018
 

So last week, some more parts arrived for this project.  Crucially, some capacitors, and some MOSFETs.

Turns out, the MOSFETs I got last time were not I²PAK … I thought that’s what I ordered last time, but clearly not, because that’s what these are, and they’re bigger than the previous ones.

No matter, lean them back like dominoes and they still fit.  I’ve got a tube of 50 of them.

I was able to put the pull-down resistor in, and I basically fitted the MOSFETs along a track, scoring the track between the legs so they didn’t short out.  For the 12ohm resistor to the drain, I’m doing half-veroboard-PCB, half-point-to-point construction to link the drain pin (annoyingly in the centre) to the outside world.

I’ll need to rustle up a 2-pin KK to act as the power input, and that board is done.  I might add two in parallel on here so a short lead can link from here to the mainboard to supply +12V.  This will go on the right-hand side (lower photo) just past where that jumper connects.

After that, the next step is wiring up the buttons and switches.  The use of 4-pin connectors should greatly simplify the wiring since everything we need is on the one connector.