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Extending the soundscape of a hexaphonic guitar pickup
sorveltaja:
Oh boy, what a job to do! Time flies, when you're having fun(or so they say). Now the vocoder pcb should match the schematic:
Next step is to verify, how well they match... only one way to find that out. Yes, by building it.
But now it's good time to take a break of it, although some traces perhaps need to be beefed up. For now, I'll leave it there.
I'll start building the phase shifter, by redrawing its pcb, as it has too thin traces, overly big pads, and some too tight spots, for my liking. I've already added letters to the bottom(like in the original pcb), to make building more straightforward:
That is the updated version of the original pcb, found at http://www.generalguitargadgets.com/effects-projects/extras/epfm-book/
Then salvaging all the reusable parts from the old phase shifter, printing 'housings' for led/ldr -pairs, and so on.
sorveltaja:
The phase shifter pcb is finally in etching bath. It took 6 or 7 times, to get all the traces to transfer. Usually it works right away, but this is a bit bigger pcb(100 x 93mm), than most ones, that I have previously made.
As I use flat iron, as a part of transfer, it just needed more heat and pressure to be distributed, than smaller ones. Fingers crossed, that the traces stand one more time the heat, when soldering, as I already roasted that pcb so many times.
Anyways, once it seemed good to go, I dropped it in etching bath, and only then noticed, that the trace pattern was mirrored.
That is one bugger of a trap, where I fall every now and then. But yes, it was (again) one of those moments of "Play it again Sam, one more time, but please, not backwards this time".
PekkaNF:
Play it again Sam gone Leslie Nielsen?
sorveltaja:
^^Just like that :D
But yeah, holes for the phase shifter pcb are now drilled. There are some fractures in only few traces, that needs to be checked, if they need to be patched, though.
Vocoder pcb images are also ready for transfer. Should make a good practicing on that size(100 x 75mm), as there are five of them.
sorveltaja:
The phase shifter board with almost all components:
IC's, some switches, and pots are to be added. Optoisolators need to be made, and the resistors parallel with ldr's, and resistors in series with leds need also be tested, and modified, if needed.
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