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This board holds the SEQ's illuminated buttons, which are driven from a shift register matrix. The ENC-PLATE board stacks on top.
A shift register chain of 3 DIN 74HC165 and 2 DOUT 74HC595 chips are used. Two of the DINs scan the encoders and one scans the button columns. The DOUT parts are connected into a matrix. Note that both the high and low sides have driver transistors (PNP and NPN, respectively). This means that the anode side of the matrix will operate with inverted behaviour (pin high = LED off).
There are special instructions for connecting the parts which are covered below.
Type | Qty | Value | Package | Parts | Mouser | Reichelt | Conrad | Other | Notes |
---|---|---|---|---|---|---|---|---|---|
Resistors | |||||||||
1 | wire link | THT | R17 | ||||||
18 | 47R 5% | THT | RJ1-9 | see instructions | |||||
8 | 100-220R 5% | THT or 1206 | SJ1-8 | see instructions | |||||
16 | 1k 5% | THT | R1-16 | ||||||
Resistor networks | |||||||||
3 | 9*10k | SIP10 | RN1-3 | bussed network, not 5 pairs of resistors | |||||
Capacitors | |||||||||
5 | 100n | 1206 | C1-5 | ||||||
0 | do not fit | C6 | |||||||
Diodes | |||||||||
24 | 1N4148 | THT | |||||||
LEDs | |||||||||
16 | RGB flat | superflux | ELV: 68-10 94 64 | see instructions | |||||
8 | various | 3mm | insert into switches | ||||||
Transistors | |||||||||
8 | BC808 | PNP SO-23 | |||||||
8 | BC818 | NPN SO-23 | |||||||
ICs | |||||||||
3 | 74HC165 | SOIC16 | IC1, IC3, IC5 | 595-SN74HC165DR | |||||
2 | 74HC595 | SOIC16 | IC2, IC4 | ||||||
Switches | |||||||||
16 | Matias | QuietClick | SW1-16 | see notes | |||||
8 | MEC/APEM | 3FTH9 | SW17-24 | 642-3FTH9 | TASTER 3FTH9 | 705276 - 62 | |||
Headers | |||||||||
1 (3) | 1*3 | male | |||||||
3 | 1*10 | male | |||||||
2 | 2*5 | male | |||||||
Hardware | |||||||||
16 | switchcaps | ALPS-DSA clear | |||||||
8 | switchcaps | 19mm | 642-1S11-19.0 | 1S11-19.0 |
note that two sets are required per SEQv4+ build!
v1.0: first release.
Take your time as some of these parts require some patience.
High-brightness LEDs are often expensive or don't have viable mounting options. To get around this, we will use flat-top superflux/piranha RGB LEDs and bend the legs over to make a pseudo SMT part :). There are at least two different LED pinouts, so make sure you know how yours function.
Important is:
The LEDs are available in RGB, but the official MIDIbox SEQ software only supports two of these colours. (if wanted, you could attach 0.1“ headers to the PCB and drive the LEDs with custom hardware.) So we need to select what LEDs are in the matrix using the resistor jumpers (RJ). Find RJ1-8 spanning across the middle of the board. Pins A(1-8) and B(1-8) represent the 8 anode busses and pins 1, 2 and 3 represent the pins of the LEDs in the row.
For the ELV-sourced LEDs, pin 1 as marked on the PCB is the red LED and pin 2 is the green one. You can mix the LED colours, e.g. if you wanted to show step 1 (and 9) as a different colour.
For the Mouser-sourced LEDs, the pinout is different. You can always check the colours of LEDs by using the diode tester of your multimeter.
Say we want red and green LEDs throughout. Simply solder RJ1-8 with 47R from A to 1 and B to 2 for each instance. RJ9 should match RJ1. For blue and green, solder A to 2 and B to 3 (depending on the LED used).
Pinheader J4 is a vestigial connector and could be used for two extra LED functions.
SJs are similar. As the current is quite high to drive the RGB LEDs, it's wise to use a 100-220R resistor to provide suitable current to the MEC LEDs. The position should match 1, 2 or 3 (two arbitrary positions) according to how the RJ of the same column is connected. Note that the forward voltage of the MEC switch LED should be the same or lower as the position chosen on the RGB LED. For instance, if RJ was set to “3” (blue LED) and a red LED was used in a MEC switch, then the current path may illuminate the red one over the blue.
Currently the design is © 2017 antilog devices with all rights reserved; all documentation is CC BY-NC-SA 3.0.