latigid on

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Image Comments posted by latigid on


  1. Very pretty! May I ask what current you're driving through the LEDs? Do you experience any voltage sag/droop at the 595 anode outs? The story apparently goes, that if you're drawing more than 5-6mA (continuous) through a 595 output pin, the source voltage will decrease. http://electronics.stackexchange.com/questions/77841/how-much-current-can-my-74hc595-handle-on-each-output-pin

    While keeping in the MIDIbox paradigm of ordinary shift register chips, one thought is to add PNP BJTs as "current sources" (moreso voltage sources due to constant current sinks on the cathodes). Any thoughts on this?


  2. Yep, the vertical spacing is the standard 15mm, the horizontal is 19mm to align with encoders. The pads would move around less if they were in blocks of 4*3, but strips of 1*4 at least hold together okay in the BLM 16*16 (an acrylic spacer helps).

    Just throwing a concept here, nothing's concrete.


  3. Top board (blue) is 108mm tall, bottom (green) is 100mm. The wooden box is an old wine case that happens to be about 133mm as the outside dimension. Inside is ~110mm, so a good facsimile for Euro rails.


  4. It works with some creative pad arranging! 

    D6_6mm_2.thumb.PNG.e0791d8f31bd9e78091ea

     

    But I agree, the D6 buttons are pretty good (I gave a few reasons in the V4L thread). In saying that they are quite tall (better for raised front panels though) and do have a bit of slop when pressed, so another option's not a bad thing.