2 layers34.7 × 53.9 mm
LCD
SrdjanEM/True-RMS-voltmeter
True RMS voltmeter for AC voltage measurments up to 1000 V. Includes ESD protection and overvoltage protection.
9 parts
2 layers89.8 × 112.8 mm
Projekat
SrdjanEM/True-RMS-voltmeterTrue RMS voltmeter for AC voltage measurments up to 1000 V. Includes ESD protection and overvoltage protection.
- Size
- 89.8 × 112.8 mm
- Copper layers
- 2
- Thickness
- 1.6 mm
- Parts
- 77
- Nets
- 66
- Pads
- 235
- Tracks, vias
- 405, 15
- Pours
- 1
- Routed
- Yes
- KiCad
- KiCad 7 (file 20221018)
- Created
- 11 Mar 2024
- Updated
- 8 May 2024
Overview
Projekat is an open-source printed circuit board by SrdjanEM, from the SrdjanEM/True-RMS-voltmeter repository on GitHub. It is a 2-layer board of 89.8 × 112.8 mm with 77 parts on 66 nets, routed with 405 tracks and 15 vias.
It is built around the ICL7107CPL, L7805 and L7905, with the MAX9075EUK and IRF4905 among its other parts. Its parts include 25 capacitors, 13 resistors, 8 diodes, 5 ICs and 4 connectors.
Main components
5
ICL7107CPL
PDIP-400℃~+70℃ 4.75V~5.25V PDIP-40 Digital Tube DriversTexas InstrumentsDigital Tube Drivers
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) RegulatorsL7905
TO-220TO-220 Voltage Regulators - Linear, Low Drop Out (LDO) Regulators ROHSKTPUncategorised
MAX9075EUK
SOT-23-5-40℃~+85℃ 1mV 3uA 580ns 5nA Rail-to-rail output Single-channel TTL、CMOS SOT-23-5 ComparatorsMaxim Integrated (Analog Devices)Comparators
IRF4905
TO-220-35℃~+175℃ 1 P-Channel 12nF 150nC@10V 1nF 2.5V 200W 450pF 60V 75A 9mΩ P-Channel TO-220 MOSFETs ROHSCmosMOSFETs
README
README.mdVoltage Measurement System with LED Display
Overview
This project presents a comprehensive solution for measuring and displaying AC voltage levels accurately. Utilizing the ICL7107 analog-to-digital converter (ADC) with a precision of 3½ digits, the system offers high-precision voltage readings in a digital format, directly interfacing with LED displays for easy readability. Designed for minimal power consumption, it is particularly suited for battery-operated devices.
Key Features
- High Precision Measurement: Leverages the ICL7107 ADC for accurate voltage reading.
- Efficient Display: Features four 7-segment SA08-11YWA LED displays for clear output visibility.
- Energy Efficient: Optimized for low power consumption, ideal for battery-operated implementations.
- Flexible Connectivity: Utilizes FFC (Flat Flexible Cable) connectors for seamless integration and ease of maintenance.
- Robust PCB Design: A dual-layer PCB design with a focus on electromagnetic stability and efficiency. Features copper pours for GND on the back layer to enhance device reliability.
Hardware Components
- ICL7107 ADC: The core component for analog-to-digital conversion, offering direct connectivity to LED displays.
- AD737: Outputs RMS value of the measured AC voltage, interfaced with the ICL7107.
- SA08-11YWA LED Displays: Four 7-segment displays with common anode configuration, powered by 5V.
- FFC Connectors: Provides a flexible and secure connection between the LED displays and the main PCB.
- PCB Materials: Utilizes FR4 for the dielectric layer and ENIG (Electroless Nickel Immersion Gold) for the copper surface finish for enhanced durability and solderability.
Full schematic
PCB
Parts
77| Qty | Value | Footprint | References |
|---|---|---|---|
| 12 | 100n | Capacitor_SMD:C_0603_1608Metric | C2, C3, C4, C5, C8, C9, C13, C14, C15, C16, C20, C25 |
| 5 | 910V | Varistor:RV_Disc_D9mm_W3.3mm_P5mm | RV2, RV3, RV4, RV5, RV6 |
| 4 | 1N4448 | Diode_THT:D_DO-35_SOD27_P7.62mm_Horizontal | D3, D4, D5, D6 |
| 4 | MountingHole | MountingHole:MountingHole_2.5mm | H1, H2, H3, H4 |
| 4 | TestPoint | TestPoint:TestPoint_Loop_D2.60mm_Drill0.9mm_Beaded | TP1, TP2, TP3, TP3 |
| 3 | 10u | Capacitor_SMD:C_0805_2012Metric | C1, C6, C7 |
| 2 | 100u | Capacitor_SMD:C_0603_1608Metric | C11, C12 |
| 2 | 1N4148 | Diode_THT:D_DO-35_SOD27_P7.62mm_Horizontal | D1, D2 |
| 2 | 1u | Capacitor_SMD:C_0805_2012Metric | C17, C18 |
| 2 | 47K | Resistor_SMD:R_1206_3216Metric | R1, R3 |
| 2 | IRF4905 | Package_TO_SOT_THT:TO-220-3_Vertical | Q1, Q2 |
| 1 | 100K | Resistor_SMD:R_1206_3216Metric | R5 |
| 1 | 100p | Capacitor_SMD:C_0603_1608Metric | C23 |
| 1 | 11K | Resistor_SMD:R_1206_3216Metric | R12 |
| 1 | 1K | Resistor_SMD:R_1206_3216Metric | R11 |
| 1 | 1K5 | Resistor_SMD:R_1206_3216Metric | R13 |
| 1 | 1M | Resistor_THT:R_Axial_DIN0204_L3.6mm_D1.6mm_P5.08mm_Horizontal | R4 |
| 1 | 1N5712 | Diode_THT:D_DO-35_SOD27_P7.62mm_Horizontal | D8 |
| 1 | 20p | Capacitor_SMD:C_0603_1608Metric | C19 |
| 1 | 220n | Capacitor_SMD:C_0603_1608Metric | C22 |
| 1 | 22n | Capacitor_SMD:C_1812_4532Metric | C24 |
| 1 | 24K | Resistor_SMD:R_1206_3216Metric | R6 |
| 1 | 330 | Resistor_SMD:R_1206_3216Metric | R2 |
| 1 | 3u3 | Capacitor_SMD:C_0805_2012Metric | C10 |
| 1 | 470n | Capacitor_SMD:C_0603_1608Metric | C21 |
| 1 | 900K | Resistor_SMD:R_1210_3225Metric | R8 |
| 1 | 90K | Resistor_SMD:R_1206_3216Metric | R9 |
| 1 | 9K | Resistor_SMD:R_1206_3216Metric | R10 |
| 1 | 9M | Resistor_SMD:R_1210_3225Metric | R7 |
| 1 | AD737 | Package_DIP:DIP-8_W10.16mm | U2 |
| 1 | Battery connector | Connector_JST:JST_XH_B3B-XH-A_1x03_P2.50mm_Vertical | J3 |
| 1 | Buzzer | Buzzer_Beeper:Buzzer_12x9.5RM7.6 | BZ1 |
| 1 | COMM | priums_lib:CONN1_FCR7350R_CLF | J2 |
| 1 | FPC Connector | priums_lib:FPC_24 | J4 |
| 1 | ICL7107CPL | Package_DIP:DIP-40_W15.24mm | U1 |
| 1 | L7805 | Package_TO_SOT_THT:TO-220-3_Vertical | U3 |
| 1 | L7905 | Package_TO_SOT_THT:TO-220-3_Vertical | U4 |
| 1 | MAX9075 | Package_TO_SOT_SMD:SOT-23-5 | U5 |
| 1 | Naponska referenca (100mV) | Potentiometer_THT:Potentiometer_Bourns_3266W_Vertical | RV1 |
| 1 | PTC | Resistor_THT:R_Axial_DIN0414_L11.9mm_D4.5mm_P7.62mm_Vertical | TH1 |
| 1 | Power ON | LED_THT:LED_D5.0mm_Horizontal_O6.35mm_Z15.0mm | D7 |
| 1 | Power ON/OFF | Button_Switch_THT:SW_CuK_JS202011AQN_DPDT_Angled | SW2 |
| 1 | Range selection | priums_lib:SW_EG2310 | SW1 |
| 1 | TestPoint_Loop_D2.50mm_Drill1.0mm_LowProfile | TestPoint:TestPoint_Loop_D2.50mm_Drill1.0mm_LowProfile | TP4 |
| 1 | VAC | priums_lib:CONN1_FCR7350R_CLF | J1 |
The 76 most common of 77 parts.
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Questions
How big is the Projekat PCB?
It measures 89.8 × 112.8 mm and has 2 copper layers, 1.6 mm thick.
What parts does the Projekat use?
77 parts, built around the ICL7107CPL, L7805, L7905 and MAX9075EUK. 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 Projekat KiCad files?
From the SrdjanEM/True-RMS-voltmeter repository on GitHub, at the commit this page was made from: the board is True RMS Voltmeter [KiCad 7.0]/True RMS Voltmeter/Projekat.kicad_pcb and its schematic True RMS Voltmeter [KiCad 7.0]/True RMS Voltmeter/Batteries/Batteries/Batteries.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Can I use the Projekat design in my own project?
Its repository states no licence, so its author keeps all rights: ask SrdjanEM before reusing the design.