2 layers61 × 61 mm
Km skillz badge kit
KnoxMakers/Electronics
schematics, board files, firmware, slide decks, and the like
42 parts3
2 layers99.1 × 94 mm
Km discrete adc
KnoxMakers/Electronics3schematics, board files, firmware, slide decks, and the like
- Size
- 99.1 × 94 mm
- Copper layers
- 2
- Thickness
- 1.6 mm
- Parts
- 66
- Nets
- 38
- Pads
- 172
- Tracks, vias
- 331, 21
- Pours
- 1
- Routed
- Yes
- KiCad
- KiCad 5 (file 20171130)
- Created
- 8 Feb 2019
- Updated
- 22 Mar 2026
Overview
Km discrete adc is an open-source printed circuit board by KnoxMakers, from the KnoxMakers/Electronics repository on GitHub. It is a 2-layer board of 99.1 × 94 mm with 66 parts on 38 nets, routed with 331 tracks and 21 vias.
It is built around the LM339 and 74LS148P-E. Its parts include 35 resistors, 12 diodes, 4 ICs, 3 capacitors and 2 connectors.
Main components
2
LM339
SOP-140℃~+70℃ 1.1mA 1.5mV 150ns 2.3nA 2V~32V 32V 57nA DTL、TTL、CMOS Four channels Open Collector SOP-14 Comparators ROHSJSMSEMIComparators
74LS148P-E
DIP-16-20℃~+75℃ 10mA 15ns@5V,15pF 4.75V~5.25V 400uA 74LS 8mA Decoder DIP-16 Signal Switches, Multiplexers, Decoders ROHSRenesas ElectronicsSignal Switches, Multiplexers, Decoders
README
README.mdElectronics
schematics, board files, firmware, slide decks, and the like
Parts
66| Qty | Value | Footprint | References |
|---|---|---|---|
| 20 | 4.7k | Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P2.54mm_Vertical | R1, R2, R3, R4, R23, R24, R25, R26, R27, R28, R29, R30, R31, R32, R33, R34 +4 |
| 14 | 4.7k | Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P7.62mm_Horizontal | R9, R10, R11, R12, R13, R14, R15, R16, R17, R18, R19, R20, R21, R22 |
| 11 | LED | Rays Footprints:LED_D3.0mm | D1, D2, D3, D4, D5, D6, D7, D8, D9, D10, D12 |
| 4 | Mount Hole | Rays Footprints:Keystone-5005 | MTH5, MTH6, MTH7, MTH8 |
| 4 | Mount Hole | Rays Footprints:Mount-Hole-#4 | MTH1, MTH2, MTH3, MTH4 |
| 3 | 1u | Capacitor_THT:C_Disc_D4.7mm_W2.5mm_P5.00mm | C1, C2, C3 |
| 2 | LM339 | Housings_DIP:DIP-14_W7.62mm_LongPads | U1, U2 |
| 1 | 74LS148 | Housings_DIP:DIP-16_W7.62mm_LongPads | U3 |
| 1 | Bourns-3310Y-xxx-xxxx | Rays Footprints:Bourns-3310Y-xxx-xxxx | R35 |
| 1 | D | Rays Footprints:D_SMB_Handsoldering | D11 |
| 1 | LM4030 | TO_SOT_Packages_THT:TO-92_Inline_Wide | U4 |
| 1 | OUTPUT | Pin_Headers:Pin_Header_Angled_1x05_Pitch2.54mm | J4 |
| 1 | SW_SPDT | Rays Footprints:KM-SPDT-Slide | SW1 |
| 1 | USB-Micro-B-Power-Only | Rays Footprints:USB Micro-B Power Only | J1 |
| 1 | VCC | Pin_Headers:Pin_Header_Straight_1x02_Pitch2.54mm | TP1 |
More from KnoxMakers/Electronics
9- 2 layers61 × 61 mm
Backlit badge kit v2
KnoxMakers/Electronics
schematics, board files, firmware, slide decks, and the like
42 parts3 - 2 layers81.3 × 50.8 mm
SMT Theremin v2
KnoxMakers/Electronics
schematics, board files, firmware, slide decks, and the like
42 parts3 - 2 layers50.8 × 96.5 mm
Km candy cane usb v1
KnoxMakers/Electronics
schematics, board files, firmware, slide decks, and the like
39 parts3 - 2 layers82.6 × 100 mm
Km ultimate badge kit
KnoxMakers/Electronics
schematics, board files, firmware, slide decks, and the like
34 parts3 - 2 layers71.9 × 68.5 mm
- 2 layers82.2 × 74 mm
Km fractal v1
KnoxMakers/Electronics
schematics, board files, firmware, slide decks, and the like
20 parts3 - 2 layers93.6 × 85 mm
- 2 layers58.4 × 58.9 mm
Intro to solder kit v2
KnoxMakers/Electronics
schematics, board files, firmware, slide decks, and the like
14 parts3
Similar boards
- 2 layers80 × 41 mm
- 4 layers160 × 100 mm
Rosco m68k
rosco-m68k/rosco_m68k
Design, documentation and software for the Really Old School Computer (M68K)
140 parts200 - 2 layers134.6 × 208.3 mm
- 6 layers243.8 × 243.8 mm
Raven
agranlund/raven
Homemade MC68060 + DSP56303 Atari-compatible computer. Hardware, firmware, and software stack
331 parts87 - 4 layers214 × 170 mm
.C68
ProbablyNotArtyom/Blitz
Blitz is a 68030 based homebrew computer I designed over the course of nearly 3 years, starting in late 2017.
185 parts51GPL-2.0 - 2 layers159.5 × 99.8 mm
- 4 layers340 × 210 mm
- 2 layers58.4 × 68.4 mm
Questions
How big is the Km discrete adc PCB?
It measures 99.1 × 94 mm and has 2 copper layers, 1.6 mm thick.
What parts does the Km discrete adc use?
66 parts, built around the LM339 and 74LS148P-E. 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 Km discrete adc KiCad files?
From the KnoxMakers/Electronics repository on GitHub, at the commit this page was made from: the board is solder-kits/km-005-discrete-adc/kicad/km-discrete-adc.kicad_pcb and its schematic solder-kits/km-001-logo-badge/kicad files/intro-to-solder-kit-v2.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Can I use the Km discrete adc design in my own project?
Its repository states no licence, so its author keeps all rights: ask KnoxMakers before reusing the design.