build it
- see here (2c)
- see here (2d)
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should be fairly straightforward: you can follow the values printed on the board. typically, you'd do the SMD parts first, then the through-hole parts, and finally the mechanical stuff. make sure to take a look at the note re: OLED below.
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ignore the 3-pin header adjacent to the 2x14 teensy header, it's not needed; "Q" is where the four NPN transistors go. here is the silkscreen as a .pdf (rev_2c).
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before installing the through-hole parts, check your soldering, especially around the dual op amps. some of the passives around them are a bit tricky to reach once the trimpots are in place; that is, if you use them (as noted, you can use jumpers instead, and 0.1% resistors). this is how things should look, with all the trimpots installed (pictured below is a rev2c pcb):
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the jacks share the ground pad, facing each other:
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if using the bourns ones, they're not tall enough. don't try to push them in. you have to solder them onto the top side of the board, so that they line up with the jacks:
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if using an aluminium panel, make sure the OLED pins don't touch the panel! (ie, cut them flush with the pcb).
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the OLED goes in between the two
^marks: ignore the right-most signal, that's DIN/MISO, which isn't needed for the display. -
also: use a low profile socket! you'll have to trim the pins somewhat so as to make things fit / line up with the other components (ie jacks, encoders):
- you have to cut one trace:
