Editing Big Digit Driver Assembly Instructions
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Line 9: | Line 9: | ||
|Type | |Type | ||
|Vendor | |Vendor | ||
− | |Part Number | + | |Vendor Part Number |
− | |Quantity | + | |Quantity per Board |
|---- | |---- | ||
|1 | |1 | ||
|N/A | |N/A | ||
− | | | + | |PCB |
|Big Digit Driver board | |Big Digit Driver board | ||
− | |Evil Mad | + | |Evil Mad Science LLC |
|N/A | |N/A | ||
|1 | |1 | ||
Line 22: | Line 22: | ||
|2 | |2 | ||
|R25 | |R25 | ||
− | | | + | |Current Sense Resistor for DP |
− | | | + | |22 ohm, substituting 24 ohm 1/4 watt carbon film resistor |
|Digikey | |Digikey | ||
|24QBK-ND | |24QBK-ND | ||
Line 29: | Line 29: | ||
|---- | |---- | ||
|3 | |3 | ||
− | |R1 | + | |R1 through R5 |
− | |68 ohm | + | |DP Load Resistors |
− | + | |68 ohm 1/4 watt carbon film resistors | |
|DigiKey | |DigiKey | ||
|68QBK-ND | |68QBK-ND | ||
Line 38: | Line 38: | ||
|4 | |4 | ||
|R11,R13,R15,R17,R19,R21,R23 | |R11,R13,R15,R17,R19,R21,R23 | ||
− | |16 ohm | + | |Current Sense Resistors |
− | + | |16 ohm 1/4 watt carbon film resistors | |
|Digikey | |Digikey | ||
|16QBK-ND | |16QBK-ND | ||
Line 46: | Line 46: | ||
|5 | |5 | ||
|R12,R14,R16,R18,R20,R22,R24,R26,R27 | |R12,R14,R16,R18,R20,R22,R24,R26,R27 | ||
− | | | + | |Base Resistors, Power LED Resistor |
− | | | + | |1k ohm 1/4 watt carbon film resistors |
|Digikey | |Digikey | ||
|1.0KQBK-ND | |1.0KQBK-ND | ||
Line 54: | Line 54: | ||
|6 | |6 | ||
|D1, D2 | |D1, D2 | ||
− | | | + | |Linear Regulator Load, DP Load (Diodes) |
− | |1N4740A | + | |1N4740A, 10V, 1 watt |
|Digikey | |Digikey | ||
|1N4740A-ND | |1N4740A-ND | ||
Line 62: | Line 62: | ||
|7 | |7 | ||
|U9 | |U9 | ||
− | | | + | |Shift Register Socket |
− | |16 pin | + | |16 pin 0.3" Socket |
|Digikey | |Digikey | ||
|A100206-ND | |A100206-ND | ||
Line 70: | Line 70: | ||
|8 | |8 | ||
|U10 | |U10 | ||
− | | | + | |Schmitt Trigger Socket |
− | |14 pin | + | |14 pin 0.3" Socket |
|Digikey | |Digikey | ||
|3M5462-ND | |3M5462-ND | ||
|1 | |1 | ||
|---- | |---- | ||
− | + | |9 | |
− | |JP1 | + | |JP1 thru JP5 |
− | | | + | |SPI Ground Jumpers/Schmitt Trigger Bypass |
− | + | |Zero ohm 'Resistors' | |
− | + | |Digikey | |
− | + | |0.0QTR-ND | |
− | | | + | |5 |
− | |||
− | |||
− | |||
|---- | |---- | ||
|10 | |10 | ||
− | |Q1 | + | |Q1 thru Q8 |
− | | | + | |Digital Control Transistors |
− | |2N3904, 40V | + | |2N3904, NPN Transistor, 40V, TO-92 |
|Digikey | |Digikey | ||
|2N3904-APCT-ND | |2N3904-APCT-ND | ||
Line 97: | Line 94: | ||
|11 | |11 | ||
|U1 thru U8 | |U1 thru U8 | ||
− | |Adjustable Linear Regulator | + | |Current Regulators |
− | + | |LM317L, Adjustable Linear Regulator, 0.1A, TO-92 | |
|Digikey | |Digikey | ||
|LM317LZ-ND | |LM317LZ-ND | ||
Line 105: | Line 102: | ||
|12 | |12 | ||
|U11 | |U11 | ||
− | | | + | |Linear Regulator |
− | |TL750L05, | + | |TL750L05, 5V, 150mA, TO-92 |
|Digikey | |Digikey | ||
|296-8002-5-ND | |296-8002-5-ND | ||
Line 113: | Line 110: | ||
|13 | |13 | ||
|C2 | |C2 | ||
− | |Bypass Capacitor | + | |Bypass Capacitor |
− | |Ceramic Capacitor | + | |10uF Ceramic Capacitor |
|Digikey | |Digikey | ||
|445-4816-ND | |445-4816-ND | ||
Line 121: | Line 118: | ||
|14 | |14 | ||
|C1, C3, C4 | |C1, C3, C4 | ||
− | |Bypass Capacitors | + | |Bypass Capacitors |
− | + | |0.1uF Ceramic Capacitor | |
|Digikey | |Digikey | ||
|BC1148TR-ND | |BC1148TR-ND | ||
Line 129: | Line 126: | ||
|15 | |15 | ||
|LED1 | |LED1 | ||
− | | | + | |Power LED |
− | |3mm | + | |3mm Yellow LED |
|Digikey | |Digikey | ||
|754-1212-ND | |754-1212-ND | ||
Line 138: | Line 135: | ||
|J2, J3 | |J2, J3 | ||
|Screw Terminal | |Screw Terminal | ||
− | |2 position euro-style | + | |2 position euro-style screw terminal |
|DigiKey | |DigiKey | ||
|ED2635-ND | |ED2635-ND | ||
Line 145: | Line 142: | ||
|17 | |17 | ||
|J5, J6 | |J5, J6 | ||
− | | | + | |SPI Headers |
− | |0.1" | + | |6 pin (2x3 DIL) 0.1" Header |
|Digikey | |Digikey | ||
|609-3202-ND | |609-3202-ND | ||
Line 153: | Line 150: | ||
|18 | |18 | ||
|J4 | |J4 | ||
− | |Power Jack | + | |Power Jack |
− | |2. | + | |2.1mm ID Barrel Jack |
|Digikey | |Digikey | ||
|CP-002AH-ND | |CP-002AH-ND | ||
Line 161: | Line 158: | ||
|19 | |19 | ||
|U9 | |U9 | ||
− | |Shift Register | + | |Shift Register |
− | |74HCT595, | + | |74HCT595, 8-bit 16DIP |
|Digikey | |Digikey | ||
|568-1560-5-ND | |568-1560-5-ND | ||
Line 169: | Line 166: | ||
|20 | |20 | ||
|U10 | |U10 | ||
− | |Schmitt | + | |Schmitt Trigger |
− | |74ACT14, | + | |74ACT14, 16DIP |
|Digikey | |Digikey | ||
|296-4368-5-ND | |296-4368-5-ND | ||
Line 177: | Line 174: | ||
|21 | |21 | ||
|J1 | |J1 | ||
− | |Display Connector | + | |Display Connector |
− | |11 Position/22 Contact 0.156" pitch | + | |11 Position/22 Contact 0.156" pitch board edge connector |
|Digikey | |Digikey | ||
|EBM11DSAN-ND | |EBM11DSAN-ND | ||
Line 185: | Line 182: | ||
|22 | |22 | ||
|N/A | |N/A | ||
− | |Standoffs | + | |Display Top Standoffs |
− | | | + | |Standoff, 7/8" round |
|Digikey | |Digikey | ||
|1848K-ND | |1848K-ND | ||
Line 193: | Line 190: | ||
|23 | |23 | ||
|N/A | |N/A | ||
− | |Display | + | |Display Bottom Standoffs |
− | | | + | |Standoff, round, 3/4" |
|DigiKey | |DigiKey | ||
|3488K-ND | |3488K-ND | ||
Line 201: | Line 198: | ||
|24 | |24 | ||
|N/A | |N/A | ||
− | | | + | |Display Top Standoff Washers |
− | | | + | |1/16" thick Nylon Washers, #6 screw |
− | |McMaster | + | |McMaster |
|90295A090 | |90295A090 | ||
|2 | |2 | ||
Line 209: | Line 206: | ||
|25 | |25 | ||
|N/A | |N/A | ||
− | |Display/Driver Board | + | |Display Bottom/Driver Board Standoffs |
− | | | + | |1/8" tall Nylon standoff |
− | |McMaster | + | |McMaster |
|94639A407 | |94639A407 | ||
|2 | |2 | ||
Line 217: | Line 214: | ||
|26 | |26 | ||
|N/A | |N/A | ||
− | |Mounting Screws | + | |Display Bottom/Driver Board/Mounting Screws |
− | |Button Socket Cap | + | |Screw, Button Socket Cap 6-32 x 1/2" |
|McMaster | |McMaster | ||
|92949A148 | |92949A148 | ||
− | | | + | |6 |
− | |---- | + | |---- |
|27 | |27 | ||
+ | |N/A | ||
+ | |Display Top | ||
+ | |Screw, Button socket Cap 6-32 x 3/8" | ||
+ | |McMaster | ||
+ | |92949A146 | ||
+ | |2 | ||
+ | |---- | ||
+ | |28 | ||
|N/A | |N/A | ||
|Delrin Insulator | |Delrin Insulator | ||
|Delrin Insulator | |Delrin Insulator | ||
− | |Evil Mad | + | |Evil Mad Science LLC |
− | |||
− | |||
− | |||
− | |||
|N/A | |N/A | ||
− | |||
− | |||
− | |||
− | |||
|1 | |1 | ||
|---- | |---- | ||
|} | |} | ||
+ | |||
+ | |||
== Assembly procedure == | == Assembly procedure == | ||
Line 249: | Line 248: | ||
=== 1. The circuit board === | === 1. The circuit board === | ||
− | Here's what the | + | Here's what the bare circuit board looks like: |
http://evilmadscience.s3.amazonaws.com/wiki/bdd/v0.9/assy/bdd_001.jpg | http://evilmadscience.s3.amazonaws.com/wiki/bdd/v0.9/assy/bdd_001.jpg | ||
Line 291: | Line 290: | ||
=== 3. Decimal Point Load Resistors === | === 3. Decimal Point Load Resistors === | ||
− | + | Let's finish off the decimal point resistors. | |
+ | |||
+ | We'll be installing 68 ohm resistors (color code: Blue/Gray/Black/Gold) in locations R1 through R5. | ||
http://evilmadscience.s3.amazonaws.com/wiki/bdd/v0.9/assy/bdd_010.jpg | http://evilmadscience.s3.amazonaws.com/wiki/bdd/v0.9/assy/bdd_010.jpg | ||
Line 318: | Line 319: | ||
Getting the hang of this? Great! | Getting the hang of this? Great! | ||
− | Next, let's install the 16 | + | Next, let's install the 16 ohms (color code: Brown/Blue/Black/Gold) current sense resistors. These come as a segment from a large spool. Just pull them straight out and straighten the leads as needed. |
http://evilmadscience.s3.amazonaws.com/wiki/bdd/v0.9/assy/bdd_016.jpg | http://evilmadscience.s3.amazonaws.com/wiki/bdd/v0.9/assy/bdd_016.jpg | ||
Line 328: | Line 329: | ||
− | === 5. Base | + | === 5. Base resistors === |
Next, locate all the 1k ohm resistors (color code: Brown/Black/Red/Gold). | Next, locate all the 1k ohm resistors (color code: Brown/Black/Red/Gold). | ||
Line 369: | Line 370: | ||
− | === 8. SPI Header Ground | + | === 8. SPI Header Ground Connections === |
− | Next, we will install the jumpers that connect the Big Digit Driver to the SPI ground line. For this we'll use zero ohm | + | Next, we will install the jumpers that connect the Big Digit Driver to the SPI ground line. For this we'll use zero-ohm 'resistors' - they have no real color code, they look like resistors with a single black stripe instead of five or more. They're not really resistors either (well, they do have a resistance - like all wire - but it is very low!) and each could actually be replaced with a length of wire. |
http://evilmadscience.s3.amazonaws.com/wiki/bdd/v0.9/assy/bdd_030.jpg | http://evilmadscience.s3.amazonaws.com/wiki/bdd/v0.9/assy/bdd_030.jpg | ||
Line 381: | Line 382: | ||
− | ''Please note that locations JP1, JP2, and JP3 are | + | '''Please note that we leave locations JP1, JP2, and JP3 empty!''' |
+ | |||
+ | These locations are the Schmitt trigger bypass jumpers. The Schmitt trigger is used to 'boost' the signals that run down a series of drivers and helps eliminate synchronization issues due to noise and attenuation. | ||
+ | |||
+ | If, for whatever reason, you don't want to use the Schmitt trigger you will need to install four jumpers in locations JP1, JP2, and JP3. Ninety-nine percent of our users should NOT install these bypass jumpers! | ||
+ | |||
+ | DO NOT use both the Schmitt trigger and bypass jumpers at the same time! Doing so shouldn't cause any damage, but the behavior of displays down the line will be strange and unpredictable. | ||
+ | |||
+ | You may note that photos later in this instruction set have these jumpers installed! This is for illustrative purposes only! '''Unless you have a good reason to bypass the Schmitt trigger, do not install these jumpers!''' | ||
− | |||
− | |||
− | === 9. Shift Register and Schmitt | + | === 9. Shift Register and Schmitt Trigger Sockets === |
Next, we will install the sockets for the ICs. | Next, we will install the sockets for the ICs. | ||
Line 422: | Line 429: | ||
http://evilmadscience.s3.amazonaws.com/wiki/bdd/v0.9/assy/bdd_034.jpg | http://evilmadscience.s3.amazonaws.com/wiki/bdd/v0.9/assy/bdd_034.jpg | ||
− | We will be installing these into locations Q1, Q2, Q3, Q4, Q5, Q6, Q7, and Q8 (in a line across the middle of the board). Note that orientation matters! Take a | + | We will be installing these into locations Q1, Q2, Q3, Q4, Q5, Q6, Q7, and Q8 (in a line across the middle of the board). Note that orientation matters! Take a peek at the board. See how the footprint is a circle with a flat side? That flat side matches up with the flat side on the part itself (the side with the text on it) - in other words, the flat side of the part should be facing toward the top of the board. |
http://evilmadscience.s3.amazonaws.com/wiki/bdd/v0.9/assy/bdd_035.jpg | http://evilmadscience.s3.amazonaws.com/wiki/bdd/v0.9/assy/bdd_035.jpg | ||
Line 519: | Line 526: | ||
− | === 17. SPI | + | === 17. SPI headers === |
These are also a bit tricky. The SPI header is a two by three block of straight pins. These should drop right into locations J5 and J6, on the left-hand and right-hand side of the board. Solder one pin on the back and then flip the board over. Make sure that the header is perpendicular to the board and the black plastic block is seated on the board. Once you're sure the header is seated properly, solder the rest of the pins on the back. | These are also a bit tricky. The SPI header is a two by three block of straight pins. These should drop right into locations J5 and J6, on the left-hand and right-hand side of the board. Solder one pin on the back and then flip the board over. Make sure that the header is perpendicular to the board and the black plastic block is seated on the board. Once you're sure the header is seated properly, solder the rest of the pins on the back. | ||
Line 550: | Line 557: | ||
http://evilmadscience.s3.amazonaws.com/wiki/bdd/v0.9/assy/bdd_066.jpg | http://evilmadscience.s3.amazonaws.com/wiki/bdd/v0.9/assy/bdd_066.jpg | ||
− | You may need to | + | You may need to fiddle with the pins a bit to get it to plug into the socket at U9. Carefully pressing the side of the pins against a flat, hard surface is a good way to do this. |
− | + | Orientation matters with this part! See that notch on one end of the IC (on the left end in the photo)? That should line up with the notch/semi-circle on the IC footprint on the board. | |
http://evilmadscience.s3.amazonaws.com/wiki/bdd/v0.9/assy/bdd_067.jpg | http://evilmadscience.s3.amazonaws.com/wiki/bdd/v0.9/assy/bdd_067.jpg | ||
Line 558: | Line 565: | ||
− | === 20. Insert Schmitt | + | === 20. Insert Schmitt Trigger === |
− | The Schmitt | + | The Schmitt trigger is the 14 pin IC that has 'SN74ACT14N' written on it. It is the bottom chip in this photo. |
http://evilmadscience.s3.amazonaws.com/wiki/bdd/v0.9/assy/bdd_066.jpg | http://evilmadscience.s3.amazonaws.com/wiki/bdd/v0.9/assy/bdd_066.jpg | ||
− | + | The Schmitt trigger and it goes in location U10. Like the shift register, orientation matters: the notch on one end of the IC (on the left end in the photo above) should line up with the notch/semi-circle on the IC footprint on the board. | |
http://evilmadscience.s3.amazonaws.com/wiki/bdd/v0.9/assy/bdd_068.jpg | http://evilmadscience.s3.amazonaws.com/wiki/bdd/v0.9/assy/bdd_068.jpg | ||
Line 620: | Line 627: | ||
=== 26. Board Spacers And Standoffs - Top of Display === | === 26. Board Spacers And Standoffs - Top of Display === | ||
− | To match the height of the stack-up on the bottom of the display, use the 1/16 inch (1.6mm) thick nylon washer, 7/8 inch (22.2mm) tall threaded standoff, and | + | To match the height of the stack-up on the bottom of the display, use the 1/16 inch (1.6mm) thick nylon washer, 7/8 inch (22.2mm) tall threaded standoff, and 3/8 inch (9.5mm) long 6-32 threaded screw. On the top corners, pass a screw through the display board and washer. Screw a standoff onto it. |
http://evilmadscience.s3.amazonaws.com/wiki/bdd/v0.9/assy/bdd_088.jpg | http://evilmadscience.s3.amazonaws.com/wiki/bdd/v0.9/assy/bdd_088.jpg | ||
Line 627: | Line 634: | ||
=== 27. Really done this time! === | === 27. Really done this time! === | ||
− | That's it, you're completely done | + | That's it, you're completely done! Hang it on a wall and plug it in! The kit includes four extra 1/2 inch 6-32 screws for mounting purposes. |
http://evilmadscience.s3.amazonaws.com/wiki/bdd/v0.9/assy/bdd_092.jpg | http://evilmadscience.s3.amazonaws.com/wiki/bdd/v0.9/assy/bdd_092.jpg | ||
http://evilmadscience.s3.amazonaws.com/wiki/bdd/v0.9/assy/bdd_083.jpg | http://evilmadscience.s3.amazonaws.com/wiki/bdd/v0.9/assy/bdd_083.jpg |