Archive for August 14th, 2012

HT GPS+Voice Circuitry: Bare PCB

Drilling the PCB went fine, as did the etching & silver plating:

PCB with edge wrap - front

PCB with edge wrap – front

The rear side has a fine ground plane:

PCB with edge wrap - rear

PCB with edge wrap – rear

The small spots scattered over the rear mark vias that stitch the front and back planes together; lacking plated-through holes, I solder nippets of 24 AWG wires to both sides. The wrinkly edge comes from solder on the copper foil binding the entire perimeter.

While I have no hard evidence that all of the fuss & bother matters, the most recent version of this circuit is the quietest yet: the machine noise from the TinyTrak3+ that plagued the first iteration has pretty much vanished.

I’ll grant you that the¬†silver plating¬†doesn’t look very silvery in these pix, but it’s quite different from the bare copper in person. Here’s the front just after rubbing it in with a vigorous circular motion:

HT-GPS PCB - raw plated - top

HT-GPS PCB – raw plated – top