2 layers130 × 80 mm
4 layers209.5 × 135.6 mm
PEL Project2 4Layer
KHarisN/Battery-Tester-PCB- Size
- 209.5 × 135.6 mm
- Copper layers
- 4
- Thickness
- 1.6 mm
- Parts
- 50
- Nets
- 77
- Pads
- 202
- Tracks, vias
- 304, 69
- Pours
- 2
- Routed
- Yes
- KiCad
- KiCad 9.0 (file 20241229)
- Created
- 11 May 2026
- Updated
- 11 May 2026
Overview
PEL Project2 4Layer is an open-source printed circuit board by KHarisN, from the KHarisN/Battery-Tester-PCB repository on GitHub. It is a 4-layer board of 209.5 × 135.6 mm with 50 parts on 77 nets, routed with 304 tracks and 69 vias.
It is built around the ATMEGA328-PU, L7805 and EC2-5NU. Its parts include 14 resistors, 8 capacitors, 8 switches, 4 ICs and 4 diodes. It belongs with the AVR (ATmega, ATtiny) boards of this library.
Main components
3
ATMEGA328-PU
PDIP-28-40℃~+85℃ 1.8V~5.5V 10bit 1KB 20MHz 23 2KB 32KB 8 Bit AVR Built-in FLASH PDIP-28 Microcontrollers (MCU/MPU/SOC) ROHSMicrochip TechnologyMicrocontrollers (MCU/MPU/SOC)
L7805
TO-220ST0℃~+125℃@(Tj) 1 1.2A 20V 2V@(1A) 42uV 500uA 5V 73dB@(120Hz) Fixed Positive Short Circuit Protection TO-220ST Voltage Regulators - Linear, Low Drop Out (LDO) Regulators ROHSOSENVoltage Regulators - Linear, Low Drop Out (LDO) Regulators
EC2-5NU
DIP,15x7.5mm-40℃~+85℃ 140mW 15mm 178Ω 1ms 220V@DC、250V@AC 2A 2ms 500mA@125VAC、2A@30VDC 5V 7.5mm 75mΩ 9.4mm Silver Alloy Two sets of changeover: 2C (DPDT) DIP,15x7.5mm Signal Relays ROHSKEMETSignal Relays
Parts
50| Qty | Value | Footprint | References |
|---|---|---|---|
| 8 | 10k | Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P7.62mm_Horizontal | R1, R2, R3, R4, R5, R6, R7, R8 |
| 7 | EC2-5NU | Relay_THT:Relay_DPDT_Kemet_EC2_NU | K1, K2, K3, K4, K5, K6, K7 |
| 6 | 360 | Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P7.62mm_Horizontal | R9, R10, R11, R12, R13, R14 |
| 6 | Battery | Battery:BatteryHolder_Keystone_2460_1xAA | BT1, BT2, BT3, BT4, BT5, BT6 |
| 4 | 1N4007 | Diode_THT:D_DO-41_SOD81_P10.16mm_Horizontal | D34, D35, D36, D37 |
| 3 | 10uF | Capacitor_THT:C_Axial_L3.8mm_D2.6mm_P7.50mm_Horizontal | C1, C3, C6 |
| 2 | 22pF | Capacitor_THT:C_Axial_L3.8mm_D2.6mm_P7.50mm_Horizontal | C2, C10 |
| 1 | 1000 uF | Capacitor_THT:CP_Radial_D10.0mm_P7.50mm | C38 |
| 1 | 10k | Potentiometer_THT:Potentiometer_Bourns_3299Y_Vertical | RV1 |
| 1 | 16 MHz | Crystal:Crystal_HC49-4H_Vertical | Y1 |
| 1 | 2200uF | Capacitor_THT:CP_Radial_D17.0mm_P7.50mm | C11 |
| 1 | 2N3055 | Package_TO_SOT_THT:TO-3 | Q18 |
| 1 | 4700 uF | Capacitor_THT:CP_Radial_D17.0mm_P7.50mm | C37 |
| 1 | ATmega328-P | Package_DIP:DIP-28_W7.62mm | U1 |
| 1 | L7805 | L7805CV:TO255P1040X460X1968-3 | U5 |
| 1 | LM7812_TO220 | Package_TO_SOT_THT:TO-220-3_Vertical | U8 |
| 1 | LOGO | LOGO | G*** |
| 1 | NHD-0420H1Z | Display:NHD-0420H1Z | U2 |
| 1 | SW_Push | Button_Switch_THT:SW_PUSH_6mm_H4.3mm | SW1 |
| 1 | Screw_Terminal_01x02 | TerminalBlock_Phoenix:TerminalBlock_Phoenix_MKDS-1,5-2-5.08_1x02_P5.08mm_Horizontal | J20 |
| 1 | Screw_Terminal_01x03 | TerminalBlock_Phoenix:TerminalBlock_Phoenix_MKDS-1,5-3-5.08_1x03_P5.08mm_Horizontal | J19 |
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Questions
How big is the PEL Project2 4Layer PCB?
It measures 209.5 × 135.6 mm and has 4 copper layers, 1.6 mm thick.
What parts does the PEL Project2 4Layer use?
50 parts, built around the ATMEGA328-PU, L7805 and EC2-5NU. 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 PEL Project2 4Layer KiCad files?
From the KHarisN/Battery-Tester-PCB repository on GitHub, at the commit this page was made from: the board is PEL_Project2_4Layer.kicad_pcb and its schematic PEL_Project2_4Layer.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Can I use the PEL Project2 4Layer design in my own project?
Its repository states no licence, so its author keeps all rights: ask KHarisN before reusing the design.