Differences

This shows you the differences between two versions of the page.

--- mididocs:seq:blm16x16_build_guide [2016/03/28 21:24] – [General considerations: read before building] latigid_on
+++ mididocs:seq:blm16x16_build_guide [2017/11/24 19:52] (current) – [Dimensions] latigid_on
@@ Line 25: / Line 25: @@
   * 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.
-  * 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.
@@ Line 44: / Line 44: @@
 ==== 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.
+[[http://www.mouser.com/ProjectManager/ProjectDetail.aspx?AccessID=e31c510729]]
 <code>
                       Quantity  Recommended     Description
-**Resistors**
+Resistors
 -MF1/4DC1002F      4	        4	        10k through hole
 -CR1206FX-1002ELF  41	100	        10k 1206
@@ Line 54: / Line 56: @@
 -PTL45-10G0-102B2  -         -               1k  slider, 10mm shaft
-**Resistor networks**
+Resistor networks
 -4816P-T2LF-10K    5	        6	        10k bussed (165 pullups)
 -4816P-1LF-1K      5	        6	        1k isolated (current sinks)
@@ Line 60: / Line 62: @@
 -4816P-1LF-56      5	        6	        56R isolated (blue LEDs)
-**Capacitors**
+Capacitors
 -TVX1C471MAD	      1	        1	        470uF electrolytic axial
 -C1206C104K5R	      23	50	        100n ceramic 1206
 -F931C106MAA	      5	        10	        10uF tantalum 1206
-**Diodes**
+Diodes
 -BAT54	      36	100	        Schottky diode SO-23
 -1N4148TR	      289	300	        1N4148 diode
 -LS4148-GS18	      5	        10	        4148 quadroMELF
-**LEDs**
+LEDs
 -APTR3216ZGC	      289	300	        LED green 1206 reverse mount
 -APTR3216QBC/D     289	300	        LED blue 1206 reverse mount
 -APTR3216SURCK     -         -               LED red 1206 reverse mount
-**Transistors**
+Transistors
 -BC81840MTF	      36	100	        NPN BJT SO-23
-**ICs**
+ICs
 -SN74LVC1G17DBVR   3	        10	        Schmitt trigger, overvoltage tolerant SO-23-5
 -SN74HC165DR	      5	        10	        74HC165D SOIC
 -SN74HC595DR	      15	20	        74HC595D SOIC
-**Connectors**
+Connectors
 -T3507-000	      1	        1	        DIN 8 panel connector
 -T3504-001	      2	        2               DIN 8 plug
@@ Line 89: / Line 91: @@
 ---                   1         -               2x5 IDC plug female (DIN8 <-> miniCore)
-**Hardware**
+Hardware
 ---                   40cm      -               10-way ribbon cable
 ---                   20        -               M3 nut (stainless)
@@ Line 99: / Line 101: @@
 ---                   8         -               M3 standoff, 25mm (for spacing PCB during building)
-**Buttons**
+Buttons
 ---                   18(19)    -               adafruit 4x4 silicone
-**Spacer**
+Spacer
 ---                   1         -               spacer cut from 3mm opaque acrylic
 </code>
+==== Parts notes ====
+  * 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.
+==== Tools needed ====
+  * 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
+==== Dimensions ====
+Here are the dimensions for the button, hole and slider locations. Note that the unmarked mounting holes are M3 (3.2mm diameter)
+{{:blm16x16_x:dimensions.png?300|}}
+{{:blm16x16_x:dimensions.png?linkonly|}}