2 layers236.8 × 169.8 mm
TK2000
clemarfolly/Microdigital-TK2000
Reprodução da PCB do TK-2000 da Microdigital, clone do Micro-Professor MPF-II
212 parts17
2 layers320 × 150 mm
DigiTrainer
RetroStack/BitStack-DigiTrainer2A trainer board for digital electronics
- Size
- 320 × 150 mm
- Copper layers
- 2
- Thickness
- 1.6 mm
- Parts
- 262
- Nets
- 473
- Pads
- 1,331
- Tracks, vias
- 4,169, 145
- Routed
- Yes
- KiCad
- KiCad 8.0 (file 20240108)
- Created
- 24 Jun 2024
- Updated
- 11 Oct 2025
Overview
DigiTrainer is an open-source printed circuit board by RetroStack, from the RetroStack/BitStack-DigiTrainer repository on GitHub, published under the MIT licence. It is a 2-layer board of 320 × 150 mm with 262 parts on 473 nets, routed with 4,169 tracks and 145 vias.
It is built around the 74LS245SC, 74LS373SC and 74LS00SC, with the 74LS194PC, 74LS02PC and 74LS04PC among its other parts. Its parts include 174 connectors, 30 capacitors, 27 ICs, 12 switches and 7 resistors.
Main components
1274LS245SC
-0℃~+70℃ 12ns@5V,45pF 15mA 24mA 4.75V~5.25V 74LS 8 Bidirectional Output enable Schmitt trigger Tri-State - Buffers, Drivers, Receivers, Transceivers ROHSTexas InstrumentsBuffers, Drivers, Receivers, Transceivers
74LS373SC
--55℃~+125℃ 1 2.6mA 24mA 38ns@5V,150pF 4.75V~5.25V 74LS 8 Output enable Tri-State - Buffers, Drivers, Receivers, Transceivers ROHSTexas InstrumentsBuffers, Drivers, Receivers, Transceivers
74LS00SC
-0℃~+70℃ 15ns@5V,50pF 2 2.7V 2V 4 4.75V~5.25V 400uA 500mV 74LS 800mV 8mA NAND Gate - Logic Gates ROHSTexas InstrumentsLogic Gates74LS194PC
-0.4mA 0℃~+70℃ 25MHz 35ns@5V,50pF 4 4.75V~5.25V 74LS 8mA Asynchronous clear function、Asynchronous parallel load function、Supports forward and reverse shift - Shift RegistersTexas InstrumentsShift Registers
74LS02PC
DIP-140℃~+70℃ 15ns@5V,15pF 2 2.7V 2V 4 4.75V~5.25V 400uA 500mV 74LS 800mV 8mA 8mA NOR Gate DIP-14 Logic Gates ROHSonsemiLogic Gates74LS04PC
PDIP-140℃~+70℃ 4.75V~5.25V 6 6.6mA 74LS PDIP-14 InvertersonsemiInverters74LS112P-E
--20℃~+75℃ 0ns 15ns@5V,15pF 2 20ns 30MHz 4.75V~5.25V 400uA 74LS Series 8mA 8mA Asynchronous Falling Edge JK-Type Set and Reset - Flip Flops ROHSRenesas ElectronicsFlip Flops
74LS161DC
-0℃~+70℃ 14ns 32MHz 4 4.75V~5.25V 74LS 93mW Asynchronous Binary Counter Programmable divide ratio、Reset function、Cascade counter、Synchronous counting Rising Edge Synchronous - Counters, DividersTexas InstrumentsCounters, Dividers
74LS163APC
DIP-164 74LS Programmable divide ratio、Reset function、Cascade counter、Synchronous counting DIP-16 Counters, Dividers ROHSTexas InstrumentsCounters, Dividers
74LS174DC
-0ns 0℃~+70℃ 1 16mA 20ns 30MHz 30ns@5V,15pF 4.75V~5.25V 400uA 6 74LS Series 8mA Asynchronous Push-Pull Reset Rising Edge - Flip Flops ROHSonsemiFlip Flops74LS175PC
PDIP-160℃~+70℃ 1 10ns 18mA 25ns@5V,15pF 30MHz 4 4.75V~5.25V 5ns 74LS Series Asynchronous Complementary type D-Type Reset Rising Edge PDIP-16 Flip Flops ROHSTexas InstrumentsFlip Flops74LS266SC
-- Logic Gates ROHSTexas InstrumentsLogic Gates
README
README.mdDigiTrainer
As part of an introduction in digital electronics workshop at VCF SW 2024, I prepared this board. The intent was to reduce lookup time for datasheets and being able to just connect the inputs and outputs of various gates and logic ICs without caring too much about power supplies. In addition, this board features DIP-switches, a toggle and slide switch, hexadecimal switches, LED arrays which do have a built in resistor for current limiting, pull-up and -down resistors, and much more.
In addition to all of that, it includes a section for a Z80 CPU, static memory, and a ROM to be able to learn to program and work with 8-bit CPUs.
Latest Files
In the "Latest" folder, you'll find the most up-to-date design files, including:
- Gerber files suitable for popular online PCB manufacturers like PCBWay and JLCPCB. Most manufacturers should be fine with either.
- A Bill of Materials (BOM) in both CSV and PDF formats.
- The full schematics of the board.
Implementation
The board has been implemented using KiCAD 8. The KiCAD project files are included in this repository.
How to Use
All inputs of various ICs and gates are on the left side of the indicated gate or IC, while outputs are on the right side of the silkscreen indications. Bi-directional pins are horizontal or on the output side (such as at the Z80 CPU for the data bus).
Many components are already connected to +5V or GND and are indicated by an "arrow up" and "triangle down" respectively. Keep in mind that an LED connected to an IC output with +5V acts as an inverted output due to current sinking.
The top right area also provides a legend of common rules/laws and symbols used in digital electronics (and logic as an extension of it).
Bill of Materials (BOM)
Below is a list of materials needed to assemble the PCB.
| Reference | Qty | Description | Footprint | Datasheet |
|---|---|---|---|---|
| C1,C2,C3,C4,C5,C6,C7,C8,C9,C10,C11,C12,C13,C14,C15,C16,C17,C18,C19,C20,C25,C26,C27,C28,C29,C30 | 26 | 0.1uF | Capacitor_SMD:C_0805_2012Metric_Pad1.18x1.45mm_HandSolder | ~ |
| C21,C24 | 2 | 1uF | Capacitor_SMD:C_0805_2012Metric_Pad1.18x1.45mm_HandSolder | ~ |
| C22,C23 | 2 | 0.01uF | Capacitor_SMD:C_0805_2012Metric_Pad1.18x1.45mm_HandSolder | ~ |
| D1,D2 | 2 | D_Schottky | Diode_THT:D_DO-41_SOD81_P7.62mm_Horizontal | ~ |
| DN1,DN2,DN3 | 3 | LED Array | Package_DIP:DIP-20_W7.62mm_Socket | ~ |
| J1,J2,J86,J158,J159,J160 | 6 | Conn_01x10 | Connector_PinSocket_2.54mm:PinSocket_1x10_P2.54mm_Vertical | ~ |
| J3,J16,J17,J18,J19,J20,J21,J22,J23,J24,J25,J26,J27,J28,J29,J30,J31,J54,J55,J56,J57,J58,J59,J60,J61,J62,J63,J64,J65,J66,J67,J68,J69,J89,J99,J100,J102,J109,J110,J111,J112,J113,J114,J122,J123,J125,J126,J133,J137,J138,J142,J144,J145,J146,J147,J148,J149,J150,J151,J152,J153,J154,J155,J156,J157,J163,J168 | 67 | Conn_01x02 | Connector_PinSocket_2.54mm:PinSocket_1x02_P2.54mm_Vertical | ~ |
| J4,J5,J6,J7,J8,J9,J10,J11,J12,J13,J14,J15,J32,J33,J34,J35,J36,J37,J38,J39,J40,J41,J42,J43,J44,J45,J46,J47,J48,J49,J50,J51,J52,J53,J70,J71,J72,J73,J74,J75,J76,J77,J78,J79,J80,J81,J87,J106,J107,J108,J135,J136,J141,J143,J167,J169 | 56 | Conn_01x03 | Connector_PinSocket_2.54mm:PinSocket_1x03_P2.54mm_Vertical | ~ |
| J82,J83,J84,J85,J98,J103,J121,J124,J161,J162 | 10 | Conn_01x06 | Connector_PinSocket_2.54mm:PinSocket_1x06_P2.54mm_Vertical | ~ |
| J88,J90,J91,J101,J104,J105,J164,J165,J166,J173,J174 | 11 | Conn_01x08 | Connector_PinSocket_2.54mm:PinSocket_1x08_P2.54mm_Vertical | ~ |
| J92,J93,J94,J172 | 4 | Conn_02x02_Odd_Even | Connector_PinHeader_2.54mm:PinHeader_2x02_P2.54mm_Vertical | ~ |
| J95 | 1 | Barrel_Jack_Switch | Connector_BarrelJack:BarrelJack_Horizontal | ~ |
| J96 | 1 | USB_B_Mini | Connector_USB:USB_Mini-B_Tensility_54-00023_Vertical | ~ |
| J97,J115,J117,J127,J128,J129,J130,J131,J132,J139,J140,J170,J171 | 13 | Conn_01x04 | Connector_PinSocket_2.54mm:PinSocket_1x04_P2.54mm_Vertical | ~ |
| J116,J118,J119,J120,J134 | 5 | Conn_01x05 | Connector_PinSocket_2.54mm:PinSocket_1x05_P2.54mm_Vertical | ~ |
| R1,R2,R3 | 3 | 10k | Resistor_SMD:R_0805_2012Metric_Pad1.20x1.40mm_HandSolder | ~ |
| R4,R5,R6,R7 | 4 | 1k | Resistor_SMD:R_0805_2012Metric_Pad1.20x1.40mm_HandSolder | ~ |
| RN1,RN2,RN3,RN4,RN5 | 5 | R_Network10 | Resistor_THT:R_Array_SIP11 | http://www.vishay.com/docs/31509/csc.pdf |
| RV1 | 1 | R_Potentiometer | Potentiometer_THT:Potentiometer_Bourns_3386P_Vertical | ~ |
| RV2 | 1 | 1M | Potentiometer_THT:Potentiometer_Bourns_3386P_Vertical | ~ |
| SW1,SW5,SW6,SW7,SW8 | 5 | SW_Push | RetroStackLibrary:SW_SPST_Push | ~ |
| SW2 | 1 | SW_DPDT_x2 | RetroStackLibrary:SW_DPDT_Push | ~ |
| SW3,SW4 | 2 | SW_DIP_x04 | Package_DIP:DIP-8_W7.62mm | ~ |
| SW9 | 1 | SW_SPDT | RetroStackLibrary:SW_SPDT_Toggle | ~ |
| SW10 | 1 | SW_Push_DPDT | RetroStackLibrary:SW_DPDT_Slide_RightAngle | ~ |
| SW11,SW12 | 2 | Hex Switch | RetroStackLibrary:SW_Hexadecimal_Horizontal | https://www.ckswitches.com/media/1333/cd.pdf |
| U1 | 1 | 74LS07 | Package_SO:SOIC-14_3.9x8.7mm_P1.27mm | www.ti.com/lit/ds/symlink/sn74ls07.pdf |
| U2 | 1 | 74LS04 | Package_SO:SOIC-14_3.9x8.7mm_P1.27mm | http://www.ti.com/lit/gpn/sn74LS04 |
| U3 | 1 | 74LS266 | Package_SO:SOIC-14_3.9x8.7mm_P1.27mm | ~ |
| U4,U5 | 2 | 74LS00 | Package_SO:SOIC-14_3.9x8.7mm_P1.27mm | http://www.ti.com/lit/gpn/sn74ls00 |
| U6 | 1 | 74LS08 | Package_SO:SOIC-14_3.9x8.7mm_P1.27mm | http://www.ti.com/lit/gpn/sn74LS08 |
| U7 | 1 | 74LS86 | Package_SO:SOIC-14_3.9x8.7mm_P1.27mm | 74xx/74ls86.pdf |
| U8 | 1 | 74LS32 | Package_SO:SOIC-14_3.9x8.7mm_P1.27mm | http://www.ti.com/lit/gpn/sn74LS32 |
| U9 | 1 | 74LS02 | Package_SO:SOIC-14_3.9x8.7mm_P1.27mm | http://www.ti.com/lit/gpn/sn74ls02 |
| U10 | 1 | 74LS244 | Package_SO:SOIC-20W_7.5x12.8mm_P1.27mm | http://www.ti.com/lit/ds/symlink/sn74ls244.pdf |
| U11 | 1 | 74LS245 | Package_SO:SO-20_5.3x12.6mm_P1.27mm | http://www.ti.com/lit/gpn/sn74LS245 |
| U12 | 1 | 74LS51 | Package_SO:SOIC-14_3.9x8.7mm_P1.27mm | http://www.ti.com/lit/ds/symlink/sn74ls51.pdf |
| U13 | 1 | 74LS174 | Package_SO:SOIC-16_3.9x9.9mm_P1.27mm | http://www.ti.com/lit/gpn/sn74LS174 |
| U14 | 1 | 74LS175 | Package_SO:SOIC-16_3.9x9.9mm_P1.27mm | http://www.ti.com/lit/gpn/sn74LS175 |
| U15 | 1 | 74LS373 | Package_SO:SO-20_5.3x12.6mm_P1.27mm | http://www.ti.com/lit/gpn/sn74LS373 |
| U16 | 1 | 74LS112 | Package_SO:SOIC-16_3.9x9.9mm_P1.27mm | http://www.ti.com/lit/gpn/sn74LS112 |
| U17 | 1 | 74LS107 | Package_SO:SOIC-14_3.9x8.7mm_P1.27mm | http://www.ti.com/lit/gpn/sn74LS107 |
| U18 | 1 | 74LS161 | Package_SO:SOIC-16_3.9x9.9mm_P1.27mm | http://www.ti.com/lit/gpn/sn74LS161 |
| U19 | 1 | 74LS163 | Package_SO:SOIC-16_3.9x9.9mm_P1.27mm | http://www.ti.com/lit/gpn/sn74LS163 |
| U20,U21 | 2 | 74LS194 | Package_SO:SOIC-16_3.9x9.9mm_P1.27mm | http://www.ti.com/lit/gpn/sn74LS194 |
| U22 | 1 | 74LS283 | Package_SO:SOIC-16_3.9x9.9mm_P1.27mm | http://www.ti.com/lit/gpn/sn74LS283 |
| U23 | 1 | 74LS85 | Package_SO:SOIC-16_3.9x9.9mm_P1.27mm | http://www.ti.com/lit/gpn/sn74LS85 |
| U24 | 1 | NE556 | Package_SO:SOIC-14_3.9x8.7mm_P1.27mm | http://www.ti.com/lit/ds/symlink/ne556.pdf |
| U25 | 1 | Z80CPU | Package_DIP:DIP-40_W15.24mm_Socket | www.zilog.com/manage_directlink.php?filepath=docs/z80/um0080 |
| U26 | 1 | ROM_27256 | Package_DIP:DIP-28_W15.24mm | ~ |
| U27 | 1 | CY7C199 | Package_DIP:DIP-28_W7.62mm | ~ |
RetroStack Libraries
To work with this KiCAD project, you'll need the RetroStack libraries for KiCAD. Please follow this link to access and install these libraries.
Support this Project
RetroStack is passionate about exploring and preserving the legacy of older computer systems. BitStack is a sub-project of RetroStack, focusing on education in digital electronics. My work involves creating detailed documentation and videos to share the knowledge. I am also dedicated to reviving these classic systems by reimplementing them and offering replacement parts at no cost. If you're keen on supporting this unique project, I invite you to visit my Patreon page. Your support would be immensely valuable and greatly appreciated!
License
This project is licensed under the MIT License - see the LICENSE file for details.
Parts
262| Qty | Value | Footprint | References |
|---|---|---|---|
| 51 | ~ | Connector_PinSocket_2.54mm:PinSocket_1x02_P2.54mm_Vertical | J133, J137, J138, J142, J144, J145, J146, J147, J148, J149, J150, J151, J152, J153, J154, J155 +35 |
| 46 | ~ | Connector_PinSocket_2.54mm:PinSocket_1x03_P2.54mm_Vertical | J4, J10, J11, J12, J13, J14, J15, J32, J33, J34, J35, J36, J37, J38, J39, J40 +30 |
| 26 | 0.1uF | Capacitor_SMD:C_0805_2012Metric_Pad1.18x1.45mm_HandSolder | C1, C2, C10, C11, C12, C13, C14, C15, C16, C17, C18, C19, C20, C25, C26, C27 +10 |
| 16 | Conn_01x02 | Connector_PinSocket_2.54mm:PinSocket_1x02_P2.54mm_Vertical | J89, J99, J100, J102, J109, J110, J111, J112, J113, J114, J122, J123, J125, J126, J163, J168 |
| 13 | Conn_01x04 | Connector_PinSocket_2.54mm:PinSocket_1x04_P2.54mm_Vertical | J97, J115, J117, J127, J128, J129, J130, J131, J132, J139, J140, J170, J171 |
| 11 | Conn_01x08 | Connector_PinSocket_2.54mm:PinSocket_1x08_P2.54mm_Vertical | J88, J90, J91, J101, J104, J105, J164, J165, J166, J173, J174 |
| 10 | Conn_01x06 | Connector_PinSocket_2.54mm:PinSocket_1x06_P2.54mm_Vertical | J82, J83, J84, J85, J98, J103, J121, J124, J161, J162 |
| 6 | Conn_01x03 | Connector_PinSocket_2.54mm:PinSocket_1x03_P2.54mm_Vertical | J106, J107, J108, J135, J136, J167 |
| 6 | Conn_01x10 | Connector_PinSocket_2.54mm:PinSocket_1x10_P2.54mm_Vertical | J1, J2, J86, J158, J159, J160 |
| 5 | Conn_01x05 | Connector_PinSocket_2.54mm:PinSocket_1x05_P2.54mm_Vertical | J116, J118, J119, J120, J134 |
| 5 | R_Network10 | Resistor_THT:R_Array_SIP11 | RN1, RN2, RN3, RN4, RN5 |
| 5 | SW_Push | RetroStackLibrary:SW_SPST_Push | SW1, SW5, SW6, SW7, SW8 |
| 4 | 1k | Resistor_SMD:R_0805_2012Metric_Pad1.20x1.40mm_HandSolder | R4, R5, R6, R7 |
| 4 | Conn_02x01 | Connector_PinHeader_2.54mm:PinHeader_1x02_P2.54mm_Vertical | J87, J141, J143, J169 |
| 4 | Conn_02x02_Odd_Even | Connector_PinHeader_2.54mm:PinHeader_2x02_P2.54mm_Vertical | J92, J93, J94, J172 |
| 3 | 10k | Resistor_SMD:R_0805_2012Metric_Pad1.20x1.40mm_HandSolder | R1, R2, R3 |
| 3 | ~ | Package_DIP:DIP-20_W7.62mm_Socket | DN1, DN2, DN3 |
| 2 | 0.01uF | Capacitor_SMD:C_0805_2012Metric_Pad1.18x1.45mm_HandSolder | C22, C23 |
| 2 | 1uF | Capacitor_SMD:C_0805_2012Metric_Pad1.18x1.45mm_HandSolder | C21, C24 |
| 2 | 74LS00 | Package_SO:SOIC-14_3.9x8.7mm_P1.27mm | U4, U5 |
| 2 | 74LS194 | Package_SO:SOIC-16_3.9x9.9mm_P1.27mm | U20, U21 |
| 2 | D_Schottky | Diode_THT:D_DO-41_SOD81_P7.62mm_Horizontal | D1, D2 |
| 2 | SW_DIP_x04 | Package_DIP:DIP-8_W7.62mm | SW3, SW4 |
| 2 | ~ | RetroStackLibrary:SW_Hexadecimal_Horizontal | SW11, SW12 |
| 1 | 1M | Potentiometer_THT:Potentiometer_Bourns_3386P_Vertical | RV2 |
| 1 | 74LS02 | Package_SO:SOIC-14_3.9x8.7mm_P1.27mm | U9 |
| 1 | 74LS04 | Package_SO:SOIC-14_3.9x8.7mm_P1.27mm | U2 |
| 1 | 74LS07 | Package_SO:SOIC-14_3.9x8.7mm_P1.27mm | U1 |
| 1 | 74LS08 | Package_SO:SOIC-14_3.9x8.7mm_P1.27mm | U6 |
| 1 | 74LS107 | Package_SO:SOIC-14_3.9x8.7mm_P1.27mm | U17 |
| 1 | 74LS112 | Package_SO:SOIC-16_3.9x9.9mm_P1.27mm | U16 |
| 1 | 74LS161 | Package_SO:SOIC-16_3.9x9.9mm_P1.27mm | U18 |
| 1 | 74LS163 | Package_SO:SOIC-16_3.9x9.9mm_P1.27mm | U19 |
| 1 | 74LS174 | Package_SO:SOIC-16_3.9x9.9mm_P1.27mm | U13 |
| 1 | 74LS175 | Package_SO:SOIC-16_3.9x9.9mm_P1.27mm | U14 |
| 1 | 74LS244 | Package_SO:SOIC-20W_7.5x12.8mm_P1.27mm | U10 |
| 1 | 74LS245 | Package_SO:SO-20_5.3x12.6mm_P1.27mm | U11 |
| 1 | 74LS266 | Package_SO:SOIC-14_3.9x8.7mm_P1.27mm | U3 |
| 1 | 74LS283 | Package_SO:SOIC-16_3.9x9.9mm_P1.27mm | U22 |
| 1 | 74LS32 | Package_SO:SOIC-14_3.9x8.7mm_P1.27mm | U8 |
| 1 | 74LS373 | Package_SO:SO-20_5.3x12.6mm_P1.27mm | U15 |
| 1 | 74LS51 | Package_SO:SOIC-14_3.9x8.7mm_P1.27mm | U12 |
| 1 | 74LS85 | Package_SO:SOIC-16_3.9x9.9mm_P1.27mm | U23 |
| 1 | 74LS86 | Package_SO:SOIC-14_3.9x8.7mm_P1.27mm | U7 |
| 1 | Barrel_Jack_Switch | Connector_BarrelJack:BarrelJack_Horizontal | J95 |
| 1 | CY7C199 | Package_DIP:DIP-28_W7.62mm | U27 |
| 1 | NE556 | Package_SO:SOIC-14_3.9x8.7mm_P1.27mm | U24 |
| 1 | ROM_27256 | Package_DIP:DIP-28_W15.24mm | U26 |
| 1 | R_Potentiometer | Potentiometer_THT:Potentiometer_Bourns_3386P_Vertical | RV1 |
| 1 | SW_DPDT_x2 | RetroStackLibrary:SW_DPDT_Push | SW2 |
| 1 | SW_Push_DPDT | RetroStackLibrary:SW_DPDT_Slide_RightAngle | SW10 |
| 1 | SW_SPDT | RetroStackLibrary:SW_SPDT_Toggle | SW9 |
| 1 | USB_B_Mini | Connector_USB:USB_Mini-B_Tensility_54-00023_Vertical | J96 |
| 1 | Z80CPU | Package_DIP:DIP-40_W15.24mm_Socket | U25 |
Questions
How big is the DigiTrainer PCB?
It measures 320 × 150 mm and has 2 copper layers, 1.6 mm thick.
What parts does the DigiTrainer use?
262 parts, built around the 74LS245SC, 74LS373SC, 74LS00SC and 74LS194PC. The full list of its parts is on this page, with links to each part's symbol and footprint where PCBKit's library has them.
Where can I download the DigiTrainer KiCad files?
From the RetroStack/BitStack-DigiTrainer repository on GitHub, at the commit this page was made from: the board is KiCAD/DigiTrainer.kicad_pcb and its schematic KiCAD/CPU.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Can I use the DigiTrainer design in my own project?
Its repository publishes it under the MIT licence: you may reuse it on that licence's terms (keep the author's notice, and for a copyleft licence share your changes alike).
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