2 layers87.6 × 50.8 mm
2 layers189.2 × 148.6 mm
Enlarger
ahradrhah/pcb- Size
- 189.2 × 148.6 mm
- Copper layers
- 2
- Thickness
- 1.6 mm
- Parts
- 65
- Nets
- 103
- Pads
- 407
- Tracks, vias
- 872, 291
- Pours
- 2
- Routed
- Yes
- KiCad
- KiCad 10.0 (file 20260206)
- Created
- 18 Sep 2026
- Updated
- 21 Sep 2026
Overview
Enlarger is an open-source printed circuit board by ahradrhah, from the ahradrhah/pcb repository on GitHub. It is a 2-layer board of 189.2 × 148.6 mm with 65 parts on 103 nets, routed with 872 tracks and 291 vias.
It is built around the 74LS125DC, ESP32-S3-DEVKITC-1-N8 and AM26LV31ID, with the MAX7221CWG+, AM26LV32ID and AZ822-2C-5DSE among its other parts. Its parts include 17 switches, 7 capacitors, 7 ICs, 6 resistors and 6 connectors. It belongs with the ESP32 boards of this library.
Main components
774LS125DC
-0℃~+70℃ 1 10ns@5.5V,50pF 15mA 18mA 24mA 4 4.5V~5.5V 74LS Power-off isolation、Output enable Tri-State Unidirectional - Buffers, Drivers, Receivers, TransceiversTexas InstrumentsBuffers, Drivers, Receivers, Transceivers
ESP32-S3-DEVKITC-1-N8
-- WiFi Modules ROHSEspressif SystemsWiFi Modules
AM26LV31ID
SOIC-16-40℃~+85℃ 0 100uA 3V~3.6V 4 Driver Enable shutdown、Overcurrent Protection、Tx/Rx enable ±3kV SOIC-16 RS-485 / RS-422 ICs ROHSTexas InstrumentsRS-485 / RS-422 ICs
MAX7221CWG+
SOIC-24-300mil0℃~+70℃ 10MHz 4-Wire Serial Interface 4V~5.5V Adjustable Glow、Common Cathode SOIC-24-300mil Digital Tube Drivers ROHSMaxim Integrated (Analog Devices)Digital Tube DriversAM26LV32ID
SOP-16-40℃~+85℃ 0 3.3V~3.6V 32Mbps 4 8mA Receiver ±5kV SOIC-16 RS-485 / RS-422 ICs ROHSTexas InstrumentsRS-485 / RS-422 ICsAZ822-2C-5DSE
插件插件 Signal Relays ROHSZETTLERSignal Relays
BC337
TO-92-31 NPN 100 100MHz 100nA 45V 5V 625mW 700mV 800mA NPN TO-92-3 Bipolar (BJT) ROHSFoshan Blue Rocket ElecBipolar (BJT)
Parts
65| Qty | Value | Footprint | References |
|---|---|---|---|
| 16 | ~ | Library:DT 6 SW | SW1, SW2, SW3, SW4, SW5, SW6, SW7, SW8, SW9, SW10, SW11, SW12, SW13, SW14, SW15, SW16 |
| 8 | ~ | Library:SC56-21SURKWA | DS1, DS2, DS3, DS4, DS5, DS6, DS7, DS8 |
| 4 | R | Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal | R1, R2, R3, R4 |
| 3 | C_Polarized | Capacitor_THT:CP_Radial_D5.0mm_P2.50mm | C1, C2, C3 |
| 2 | C | Capacitor_SMD:C_1206_3216Metric_Pad1.33x1.80mm_HandSolder | C6, C7 |
| 2 | C | Capacitor_THT:C_Disc_D5.0mm_W2.5mm_P5.00mm | C4, C5 |
| 2 | Conn_01x15_Shielded | Connector_Dsub:DSUB-15_Pins_Horizontal_P2.77x2.84mm_EdgePinOffset7.70mm_Housed_MountingHolesOffset9.12mm | J3, J5 |
| 2 | R | Resistor_SMD:R_1206_3216Metric_Pad1.30x1.75mm_HandSolder | R5, R6 |
| 2 | ~ | Library:DoubleLED5000 | U1, U2 |
| 1 | 74LS125 | Package_DIP:DIP-14_W7.62mm | U5 |
| 1 | AM26LV31 | Package_SO:SOIC-16_3.9x9.9mm_P1.27mm | U6 |
| 1 | AM26LV32 | Package_SO:SOIC-16_3.9x9.9mm_P1.27mm | U7 |
| 1 | AZ822-2C-5DSE | Library:AZ822-2C-5DSE | K1 |
| 1 | AudioJack3 | Library:STX-3000 | J2 |
| 1 | BC337 | Package_TO_SOT_THT:TO-92_Inline | Q1 |
| 1 | Conn_01x04_Pin | Library:MEBP 4-4S | J4 |
| 1 | Conn_01x06_Pin | TerminalBlock:TerminalBlock_MaiXu_MX126-5.0-06P_1x06_P5.00mm | J1 |
| 1 | Conn_02x12_Odd_Even | Library:Raspberry | J6 |
| 1 | D | Diode_THT:D_DO-41_SOD81_P10.16mm_Horizontal | D1 |
| 1 | ESP32-S3-DevKitC | PCM_Espressif:ESP32-S3-DevKitC | U3 |
| 1 | MAX7221 | Package_DIP:DIP-24_W7.62mm | U4 |
The 53 most common of 65 parts.
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Questions
How big is the Enlarger PCB?
It measures 189.2 × 148.6 mm and has 2 copper layers, 1.6 mm thick.
What parts does the Enlarger use?
65 parts, built around the 74LS125DC, ESP32-S3-DEVKITC-1-N8, AM26LV31ID and MAX7221CWG+. 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 Enlarger KiCad files?
From the ahradrhah/pcb repository on GitHub, at the commit this page was made from: the board is enlarger/enlarger.kicad_pcb and its schematic DoubleLED5000/DoubleLED5000.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Can I use the Enlarger design in my own project?
Its repository states no licence, so its author keeps all rights: ask ahradrhah before reusing the design.