2 layers85.7 × 54 mm
2 layers70 × 65 mm
Digital Voltmeter
tejasgolhar2/Digital-Voltmeter2The mini-project which aims to measure the voltage precisely. The voltmeter uses ICL7107 Analog to Digital Converter Microprocessor
- Size
- 70 × 65 mm
- Copper layers
- 2
- Thickness
- 1.6 mm
- Parts
- 31
- Nets
- 61
- Pads
- 140
- Tracks, vias
- 369, 9
- Pours
- 2
- Routed
- Yes
- KiCad
- KiCad 9.0 (file 20241229)
- Created
- 16 Oct 2023
- Updated
- 31 Oct 2025
Overview
Digital Voltmeter is an open-source printed circuit board by tejasgolhar2, from the tejasgolhar2/Digital-Voltmeter repository on GitHub. It is a 2-layer board of 70 × 65 mm with 31 parts on 61 nets, routed with 369 tracks and 9 vias.
It is built around the SA39-11EWA. Its parts include 10 resistors, 8 capacitors, 5 ICs, 4 connectors and 3 diodes.
Main components
1Parts
31| Qty | Value | Footprint | References |
|---|---|---|---|
| 5 | 1K | Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P7.62mm_Horizontal | R1, R2, R3, R4, R7 |
| 4 | SA39-11EWA | Display_7Segment:Sx39-1xxxxx | U4, U5, U6, U7 |
| 3 | 100nF | Capacitor_THT:C_Disc_D3.0mm_W1.6mm_P2.50mm | C4, C5, C7 |
| 2 | 10uF | Capacitor_THT:CP_Radial_D6.3mm_P2.50mm | C6, C8 |
| 2 | 1N4148 | Diode_THT:D_DO-35_SOD27_P7.62mm_Horizontal | D1, D2 |
| 2 | Screw_Terminal_01x02 | TerminalBlock_Phoenix:TerminalBlock_Phoenix_MKDS-1,5-2_1x02_P5.00mm_Horizontal | J1, J2 |
| 1 | 100pF | Capacitor_THT:C_Disc_D3.0mm_W1.6mm_P2.50mm | C1 |
| 1 | 10K | Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P7.62mm_Horizontal | R9 |
| 1 | 120K | Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P7.62mm_Horizontal | R5 |
| 1 | 1M | Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P7.62mm_Horizontal | R10 |
| 1 | 220nF | Capacitor_THT:C_Disc_D3.0mm_W1.6mm_P2.50mm | C2 |
| 1 | 22K | Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P7.62mm_Horizontal | R8 |
| 1 | 47K | Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P7.62mm_Horizontal | R6 |
| 1 | 47nF | Capacitor_THT:C_Disc_D3.0mm_W1.6mm_P2.50mm | C3 |
| 1 | 5K | Potentiometer_THT:Potentiometer_Bourns_3386P_Vertical | RV1 |
| 1 | ICL_7107_Conn_02x20_Counter_Clockwise | Package_DIP:DIP-40_W15.24mm | J3 |
| 1 | LED | LED_THT:LED_D5.0mm | D3 |
| 1 | LM555_Conn_02x04_Counter_Clockwise | Package_DIP:DIP-8_W7.62mm | J4 |
| 1 | LM7805_TO220 | Package_TO_SOT_THT:TO-220-3_Vertical | U3 |
Questions
How big is the Digital Voltmeter PCB?
It measures 70 × 65 mm and has 2 copper layers, 1.6 mm thick.
What parts does the Digital Voltmeter use?
31 parts, built around the SA39-11EWA. 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 Digital Voltmeter KiCad files?
From the tejasgolhar2/Digital-Voltmeter repository on GitHub, at the commit this page was made from: the board is Iteration_2/Project_Files/digital_voltmeter-2025-10-26_101858/digital_voltmeter.kicad_pcb and its schematic Iteration_2/Project_Files/digital_voltmeter-2025-10-26_101858/digital_voltmeter.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Can I use the Digital Voltmeter design in my own project?
Its repository states no licence, so its author keeps all rights: ask tejasgolhar2 before reusing the design.
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