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seqv4plus_le_mec [2017/11/20 18:05]
latigid_on [BOM v1.0]
seqv4plus_le_mec [2018/08/20 21:15] (current)
latigid_on
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-====== SEQv4+ le MEC ======+====== SEQv4+ le mec ======
  
 This board holds the SEQ's illuminated buttons, which are driven from a shift register matrix. The [[seqv4plus_enc-plate|ENC-PLATE]] board stacks on top. This board holds the SEQ's illuminated buttons, which are driven from a shift register matrix. The [[seqv4plus_enc-plate|ENC-PLATE]] board stacks on top.
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 ===== Schematic ===== ===== Schematic =====
  
-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).+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). Actually the low (cathode) side is also "​inverted,"​ as we turn the transistor "​on"​ to sink the current by toggling the 595 pin high
  
 There are special instructions for connecting the parts which are covered below. There are special instructions for connecting the parts which are covered below.
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 ^Diodes^^^^^^^^^^  ^Diodes^^^^^^^^^^
 |         ​|24 ​   |1N4148 |THT         ​| ​           |      |        |      |     | |  |         ​|24 ​   |1N4148 |THT         ​| ​           |      |        |      |     | | 
-|         ​|24 ​   |BAT54|SOT-23 |            |512-BAT54 ​     |BAT 54 SMD        |      |     |(for prototypes, stack on top of BC818 transistors ​+|         ​|24 ​   |BAT54|SOT-23 |            |512-BAT54 ​     |BAT 54 SMD        |      |     | | 
 ^LEDs^^^^^^^^^^  ^LEDs^^^^^^^^^^
 |         |16 |RGB flat |superflux ​ |            |      |        |      |ELV: 68-10 94 64     |see instructions| ​ |         |16 |RGB flat |superflux ​ |            |      |        |      |ELV: 68-10 94 64     |see instructions| ​
seqv4plus_le_mec.1511201103.txt.gz ยท Last modified: 2017/11/20 18:05 by latigid_on