Seb's Synth-DIY Pages

Box-O-Trix - Parts list


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Here is a complete BOM for the Box-O-Trix PCB.  If you are having trouble with a particular
part, please just ask () and I will add some more information here.

Most resistors are spec'ed as 1% 50ppm/C, although this kind of precision is not necessary
everywhere - use your common sense if you want to use 5% resistors in some places.

QTY  PART-REFS                     VALUE          
---  ---------                     -----          
Resistors
---------
20   R1,R2,R4,R6,R7,R17,R38,R52,   100K   (1% 50ppm/C)
     R53,R57,R58,R60,R61,R65,R66,
     R89,R101,R119,R128,R130
6    R29,R50,R84,R85,R129,R131     10K    (1% 50ppm/C)
1    R1?                           ??K    (Optional tone shaping component
                                           to use up spare PCB space)
3    R3,R141,R145                  5K1    (1% 50ppm/C)
4    R19,R24,R40,R45               5K1    (+3300ppm/C PTC
                                           I used Farnell 732308
                                           which is actually 3000ppm/C)
7    R5,R54,R59,R62,R67,R109,R124  12K    (1% 50ppm/C)
2    R8,R9                         10M    (1% 50ppm/C)
2    R10,R31                       51R    (1% 50ppm/C)
12   R11,R32,R74,R76,R77,R78,R79,  300K   (1% 50ppm/C)
     R88,R92,R93,R94,R96
10   R12,R13,R18,R33,R34,R39,R82,  20K    (1% 50ppm/C)
     R83,R106,R107
2    R14,R35                       27K    (1% 50ppm/C)
6    R15,R22,R36,R43,R138,R140     2M2    (1% 50ppm/C)
2    R16,R37                       75K    (1% 50ppm/C)
4    R20,R28,R41,R49               560K   (1% 50ppm/C)
6    R21,R25,R27,R42,R46,R48       30K    (1% 50ppm/C)
4    R23,R44,R99,R108              200R   (1% 50ppm/C)
4    R26,R47,R102,R120             220K   (1% 50ppm/C)
2    R30,R51                       1K4    (1% 50ppm/C)
2    R55,R63                       120K   (1% 50ppm/C)
4    R56,R64,R70,R115              1M     (1% 50ppm/C)
2    R68,R113                      470K   (1% 50ppm/C)
6    R69,R103,R114,R121,R132,R133  1K     (1% 50ppm/C)
2    R71,R116                      470R   (1% 50ppm/C)
6    R72,R100,R117,R118,R142,R146  4K7    (1% 50ppm/C)
2    R73,R91                       150K   (1% 50ppm/C)
6    R75,R97,R104,R105,R122,R123   15K    (1% 50ppm/C)
2    R80,R98                       510R   (1% 50ppm/C)
2    R81,R90                       360K   (1% 50ppm/C)
2    R86,R87                       100R   (1% 50ppm/C)
2    R95,R139                      200K   (1% 50ppm/C)
6    R110,R111,R112,R125,R126,     100T   (Select between 0K and 100K
     R127                                  to give 4.5V at JFET drains)
2    R134,R137                     240R   (1% 50ppm/C)
2    R135,R136                     2K2    (1% 50ppm/C)
3    R143,R148,R149                220R   (1% 50ppm/C)
1    R144                          680R   (1% 50ppm/C)
1    R147                          1.5K   (1% 50ppm/C)           

Capacitors
----------
5    C1,C3,C18,C36,C40             4.7uF  (Radial electrolytic)
2    C1?,C3?                       ???pF  (Optional tone shaping components
                                           to use up spare PCB space)
13   C2,C11,C16,C26,C31,C33,C34,   1uF    (Radial electrolytic)
     C35,C37,C38,C39,C98,C99
1    C2?                           ???nF  (Optional tone shaping component
                                           to use up spare PCB space)
2    C4,C19                        47pF   (Low K Ceramic disc)
8    C5,C6,C20,C21,C41,C42,C54,    47uF   (Radial electrolytic)
     C62
8    C7,C10,C22,C25,C52,C58,C89,   10uF   (Radial electrolytic)
     C90
2    C95,C96                       10uF   (Tantalum)
8    C8,C13,C17,C23,C28,C32,C73,   100nF  (0.2" pitch polyester)
     C83
32   C43,C44,C45,C46,C47,C48,C49,  100nF  (Axial multilayer ceramic)
     C50,C51,C55,C56,C57,C59,C60,
     C63,C64,C65,C66,C67,C68,C92,
     C94,C100,C101,C102,C103,C104,
     C105,C106,C107,C108,C109
5    C9,C14,C24,C29,C97            10nF   (0.2" pitch polyester)
2    C12,C27                       0.47uF (Radial electrolytic)
4    C15,C30,C53,C61               22pF   (Low K Ceramic disc)
6    C69,C71,C74,C79,C81,C84       22nF   (0.2" pitch polyester)
2    C70,C80                       470pF  (Low K Ceramic disc)
2    C72,C82                       680nF  (0.2" pitch polyester)
2    C75,C85                       15nF   (0.2" pitch polyester)
6    C76,C77,C78,C86,C87,C88       2.2nF  (0.2" pitch polyester)
2    C91,C93                       2200uF (Radial electrolytic)

Integrated Circuits
-------------------
12   U1,U4,U5,U7,U8,U10,U12,U14,   TL072      (Dual JFET Opamp)
     U22,U26,U28,U29
2    U2,U6                         THAT4301   (Analog Engine)
2    U3,U9                         LM3916     (Bar Display Driver)
                                or LM3914
2    U11,U13                       4069UB     (Hex CMOS Inverter)
1    U15                           LM358      (Dual Single Supply Opamp)
2    U17,U24                       THAT2180   (VCA)
1    U18                           OP275      (Dual Bipolar/JFET Opamp)
1    U19                           78L05      (Voltage Regulator)
1    U20                           PIC16F688  (Microcontroller)
1    U21                           6N139      (Optoisolator)
1    U23                           LM317T     (Voltage Regulator)
1    U25                           LM337T     (Voltage Regulator)

Transistors
-----------
6    Q1,Q2,Q3,Q4,Q5,Q6             J201       (JFET)
6    Q7,Q8,Q9,Q10,Q11,Q12          2N3904     (NPN)

Diodes
------
6    D1,D2,D5,D6,D12,D13           LED        (Green)    
22   D3,D4,D7,D8,D9,D10,D11,D14,   1N4148     (Signal diode)    
     D15,D16,D17,D18,D19,D20,D21,
     D22,D23,D24,D25,D26,D33,D34
2    D27,D28 (= D57,D58 on PCB)    LED        (Red)      
4    D29,D30,D31,D32               1N4002     (Rectifier diode)

Miscellaneous
-------------
2    FB1,FB2                       FERRITE BEAD  (Rapid 26-4865)
1    J1                            15-18V AC         
2    J2,J3                                        
2    LED1,LED2                     LED-BARGRAPH-RED
5    RV1,RV2                       50K           (0.2" x 0.2" pitch trimmer)
2    RV5,RV6                       1K            (0.2" x 0.2" pitch trimmer)
1    SKT1                          COMP1 IN       
1    SKT2                          SIDE CHAIN 1 IN
1    SKT3                          COMP1 OUT      
1    SKT4                          SIDE CHAIN 1 OUT
1    SKT5                          COMP2 IN       
1    SKT6                          SIDE CHAIN 2 IN
1    SKT7                          COMP2 OUT      
1    SKT8                          SIDE CHAIN 2 OUT
1    SKT9                          MOS1 IN        
1    SKT10                         MOS1 OUT       
1    SKT11                         MOS2 IN        
1    SKT12                         MOS2 OUT       
1    SKT13                         CLIP1 IN       
1    SKT14                         CLIP1 OUT      
1    SKT15                         GATE1 IN       
1    SKT16                         GATE1 TRIG     
1    SKT17                         GATE1 OUT      
1    SKT18                         MIDI IN        
1    SKT19                         GATE2 IN       
1    SKT20                         GATE2 TRIG     
1    SKT21                         GATE2 OUT      
1    SKT22                         MIDI THRU      
1    SKT23                         JFET1 IN       
1    SKT24                         JFET1 OUT      
1    SKT25                         JFET2 IN       
1    SKT26                         JFET2 OUT      
4    SW1,SW2,SW3,SW5               SW-DPDT        
2    SW4,SW6                       SW-SP6T        
2    SW7,SW8                       SW-SP3T        
1    SW9                           MIDI Channel   
2    SW10,SW11                     SW-SPST        
9    VR1,VR2,VR4,VR15,VR17,VR18,   100K           
     VR20,VR28,VR30
3    VR3,VR8,VR13                  50K
10   VR5,VR6,VR10,VR11,VR16,VR19,  1M             
     VR23,VR26,VR31,VR32
4    VR7,VR9,VR12,VR14             10K            
2    VR21,VR29                     1M Log         
2    VR22,VR25                     4K7 Log        
2    VR24,VR27                     470K
(All socket, switch and pot connectors are 0.1" pitch Molex KK PCB
 headers or cheaper equivalent like JYK P2500-xx/H2500-xx)

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