mididocs:seq:blm16x16_build_guide
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mididocs:seq:blm16x16_build_guide [2016/03/28 21:26] latigid_on [Parts list] |
mididocs:seq:blm16x16_build_guide [2017/11/24 19:52] (current) latigid_on [Dimensions] |
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| * Pull-down resistors on current sink transistor bases (important when bases are floating and should decrease power consumption). | * Pull-down resistors on current sink transistor bases (important when bases are floating and should decrease power consumption). | ||
| * Schottky diodes from base to collector of current sink transistors. This helps to turn transistors "off" quicker and reduces "ghosting" in the matrix. | * Schottky diodes from base to collector of current sink transistors. This helps to turn transistors "off" quicker and reduces "ghosting" in the matrix. | ||
| - | * Output enable (/OE) delay implemented on pin 6 of 74HC595 chips. At power up the capacitor will charge, holding all outputs in a high impedance state until the +5V rail is stable. At power down this capacitor discharges through a pull down resistor, aided by a diode. One delay circuit is provided for each SCALAR section. | + | * Output enable (/OE) delay implemented on pin 13 of 74HC595 chips. At power up the series capacitor will charge, holding all outputs in a high impedance state to ensure all registers have been initialised. One delay circuit is provided for each SCALAR section. |
| For minimal external cabling, the BLM connects to a SEQ v4 via an 8-pin DIN connector. This combines MIDI in, MIDI out and power; the communications protocol sent and received by the BLM is standard MIDI. Most users will incorporate a Quad IIC board into their SEQ case, which is the simplest way to arrange the DIN8 connector, optocoupler and header pins. | For minimal external cabling, the BLM connects to a SEQ v4 via an 8-pin DIN connector. This combines MIDI in, MIDI out and power; the communications protocol sent and received by the BLM is standard MIDI. Most users will incorporate a Quad IIC board into their SEQ case, which is the simplest way to arrange the DIN8 connector, optocoupler and header pins. | ||
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| ==== Parts list ==== | ==== Parts list ==== | ||
| - | The following parts are available from Mouser | + | The following parts are available from Mouser, you can try this shopping basket to save time. |
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| + | [[http://www.mouser.com/ProjectManager/ProjectDetail.aspx?AccessID=e31c510729]] | ||
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| + | ==== Parts notes ==== | ||
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| + | * You can choose either Blue+Green LEDs (recommended) or Blue+Red. You could interchange some Green for Red. Green+Red is not recommended as the colour mixing is poor. | ||
| + | * Slider height: I specified 15mm shaft sliders, you could change these for 10mm. 15mm will protrude 13mm out of the case, which might be a bit long. 10mm will only protrude 8mm, so they would be less likely to break off and will probably be a bit more sturdy. TK. suggests 1k should work, the others are too high in resistance to get good jitter-free values (10k sliders with the shorter shaft aren't readily available). | ||
| + | * You should use the indicated panel mount DIN, but a cheaper pair of DIN8 plugs might work. | ||
| + | * M2 hardware is a bit difficult to find in normal stores, but Boltbase on eBay has good deals. | ||
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| + | ==== Tools needed ==== | ||
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| + | * Soldering iron, I managed with a normal tip but it’s a bit tricky with some components | ||
| + | * Solder, probably leaded. 0.5mm is strongly recommended for at least the ICs (1206 can be easily done with 1mm solder). | ||
| + | * Desoldering wick and/or solder pump. Useful when the pads get too much solder | ||
| + | * Tweezers to pick and place components | ||
| + | * Cutters for diodes and a few through hole components | ||
| + | * Good eyes or light and a loupe | ||
| + | * 2-3 small clamps | ||
| + | * Flat work surface | ||
| + | * Multimeter, test continuity between pads | ||
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| + | ==== Dimensions ==== | ||
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| + | Here are the dimensions for the button, hole and slider locations. Note that the unmarked mounting holes are M3 (3.2mm diameter) | ||
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| + | {{:blm16x16_x:dimensions.png?300|}} | ||
| + | {{:blm16x16_x:dimensions.png?linkonly|}} | ||
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mididocs/seq/blm16x16_build_guide.1459200408.txt.gz · Last modified: 2016/03/28 21:26 by latigid_on
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