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Transistor 4-Bit Register

DragonMinded·minidragon·schematics/PCBs/4-Bit Register/Transistor 4-Bit Register.kicad_pcb

Transistor 4-Bit Register PCB layout, top view — open source board by DragonMinded

About the Transistor 4-Bit Register PCB

Transistor 4-Bit Register is an open source PCB design by DragonMinded, published on GitHub. It is a 2-layer board measuring 109.2 × 85.1 mm, with 172 components from 12 distinct parts.

By type, the board carries 89 resistors, 66 transistors, 8 connectors, 5 capacitors and 4 diodes.

From the project

Hardware and software files for the MiniDragon CPU.

Schematics, hardware simulator and software files for the MiniDragon CPU. This is a from-scratch CPU that I designed and am implementing using transistors, capacitors, resistors and diodes. The goal is to make an 8-bit CPU that could be used for general-purpose computing. There are a lot of toy instruction sets floating around on the web. I chose instead to design my own, loosely based off of the PDP and 6502. It is a single accumulator design with a pair of 16-bit stack pointers and a pair of temporary 8-bit registers. Instructions are 8 bits, operands are 8 bits from memory, temporary…

Transistor 4-Bit Register bill of materials (BOM)

172 components, 12 distinct parts.

QtyPartRefs
66
2N2222
Q1, Q2, Q4, Q5, Q6, Q7, Q8, Q9 +58
1
CLK
J1
1
EN
J2
1
D
J3
1
RST
J4
1
OUT
J5
3
Power
J6, J7, J8
4
LED
D1, D2, D3, D4
5
0.1uF
C1, C2, C3, C4, C5
38
1K
R1, R5, R7, R11, R13, R14, R17, R18 +30
3
100
R2, R3, R4
48
10K
R6, R8, R9, R10, R12, R15, R16, R19 +40

Transistor 4-Bit Register design files

The KiCad project lives in the DragonMinded/minidragon repository on GitHub; these links point at the commit this page was built from.

Transistor 4-Bit Register: common questions

How big is the Transistor 4-Bit Register PCB?

The Transistor 4-Bit Register measures 109.2 × 85.1 mm, has 2 copper layers and is 1.6 mm thick.

How many components are on the Transistor 4-Bit Register?

172 components, from 12 distinct parts. The full bill of materials is listed on this page.

Where can I download the Transistor 4-Bit Register design files?

From the DragonMinded/minidragon repository on GitHub, which has the KiCad layout and the schematic; the links under Design files point to each one.

Can I use the Transistor 4-Bit Register design in my own project?

The repository has no license, so all rights stay with DragonMinded. Use it as a reference, and ask the author before reusing the design.

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