1. Introducció
This document provides detailed instructions for assembling, setting up, and operating the ICL7107 5V DC Digital Voltmeter DIY Electronic Kit. Designed for DIY enthusiasts, this kit allows you to build a high-precision digital voltmeter with a clear red display. Please read all instructions carefully before beginning assembly.
2. Característiques del producte
- Fast reaction speed and high precision.
- Clear, intuitive reading with good stability.
- Advanced and reasonable circuit design with strong anti-interference ability, effectively suppressing high-frequency interference.
- Constructed from good quality materials with excellent technology, ensuring beautiful appearance, long service life, and easy installation.
- Suitable for welding and assembling by DIY enthusiasts.
3. Especificacions tècniques
| Paràmetre | Valor |
|---|---|
| Voltage | DC 5V |
| Corrent de treball | 35 mA |
| Precisió de la mesura | Calibratable for high precision |
| Measuring Range (3 levels) | 0-2V, 0-20V, 0-200V |
| Mida de PCB | 70.6 mm x 39 mm |
| Meter Head Mounting Hole Size | 77 mm x 40 mm |
| Display Window Size | 51 mm x 24 mm |
| Color de la pantalla | Vermell |
| Tipus | Voltage Regulador |
| Aplicació | Ordinador |
| paquet | SOP |
| Condició | Nou |
4. Contingut del kit
The DIY kit includes the following components:
- 1x PCB board
- 3x 1N4148 diodes
- 1x 5.1V voltage regulator diode
- Resistència de 1 x 100 ohms
- Resistència de 1 x 270 ohms
- 2x 2K resistors
- 1x 20K resistor
- 1x 47K resistor
- 1x 56K resistor
- 2x 100K resistors
- 1x 1M resistor
- 1x 2.2MH inductance
- 2x 104 monolithic capacitors
- 2x 101 monolithic capacitors
- 1x 224 monolithic capacitor
- 1x 474 monolithic capacitor
- 2x 10UF25V electrolytic capacitors
- 1x C1815 transistor
- 1x TL431 voltage referència
- 2x 3296-202 Potentiometers
- 1x XH2.54-2P upright seat
- 1x XH2.54-2P line
- 1x KF301-2-seat terminal block
- 1x 40P chip holder (IC socket)
- 1x ICL7107 Chip
- 4x 0.56 inch one digit digital tubes (7-segment displays)
- 1x estoig
- 4x M2*6 self-tapping screws
5. Instruccions de muntatge
Eines necessàries (no incloses): Multimeter, electric soldering iron, water pliers.
Follow these steps to assemble your voltmeter kit:
- Identificació de components: Familiarize yourself with all the components provided in the kit. Refer to the component layout diagrams for placement.
- Solder Smaller Components First: Begin by soldering the smallest components to the PCB, such as resistors and diodes, followed by capacitors, transistors, and potentiometers.
- Install IC Socket: Solder the 40P chip holder (IC socket) onto the PCB. Ensure correct orientation.
- Install Digital Displays: Solder the four 0.56 inch one-digit digital tubes (7-segment displays) onto the designated positions on the PCB.
- Insert ICL7107 Chip: Carefully insert the ICL7107 chip into its socket. Pay close attention to the direction of the chip's U port (notch or dot) and ensure it matches the orientation marked on the PCB socket. Do not insert the chip backwards to avoid damage.
- Mount PCB in Case: Secure the assembled PCB into the provided case using the M2*6 self-tapping screws.
- Review Diagrama De Circuit: For a comprehensive understanding of the connections, refer to the circuit diagram.
6. Configuració i calibratge
- Connexió d'alimentació: Connect a DC 5V power supply to the designated positive and negative terminals on the board.
- Measurement Connection: Connecteu el voltage to be measured to the 'Measure' input terminals (positive and negative).
- Calibració: To achieve high precision, the voltmeter can be calibrated. Input a known, stable voltage (e.g., from a calibrated power supply). Then, adjust the calibration potentiometer until the value displayed by the voltmeter matches the measurement value from a reference multimeter. Specifically, adjust the potentiometer so that the voltage between pin 36 and pin 35 of the ICL7107 chip is 100mV.
7. Instruccions de funcionament
Once assembled and calibrated, connect the voltmeter to the circuit where you wish to measure voltage. The red digital display will show the measured voltage. Si el vol mesurattage exceeds the selected range, the display will show '1' or '-1' as an overrange indicator.
8. Measurement Range Selection
The voltmeter supports three measurement ranges, selected by soldering specific points on the PCB and choosing the appropriate RX welding resistance value:
- 0-2V Range: Weld the two solder points labeled '0-2V' together. The RX welding resistance value should be 1K. This range is for measuring small voltages.
- 0-20V Range: Weld the two solder points labeled '0-20V' together. The RX welding resistance value should be 100K. This range is for measuring low and medium voltages.
- 0-200V Range: Weld the two solder points labeled '0-200V' together. The RX welding resistance value should be 1M. This range is for high voltage mesura.
The kit includes 100K and 1M resistors for RX, allowing you to select the appropriate range for your application.
9. Ammeter Conversion
This voltmeter can also be converted into an ammeter (0-2A range). To do this:
- Reserve a 2W 0.1Ω high-precision resistance welding position on the board.
- Weld the appropriate resistance into this position.
- The RX resistor does not need to be welded for ammeter functionality.
10. Solució De Problemes
- Sense pantalla: Check power supply connections (DC 5V) and ensure the ICL7107 chip is inserted correctly and fully seated in its socket. Verify all soldered connections for continuity.
- Lectures incorrectes: Perform calibration as described in Section 6. Ensure the correct measurement range is selected (Section 8) and the RX resistor is properly installed for the chosen range.
- Overrange Display ('1' or '-1'): El vol mesurattage exceeds the currently selected range. Switch to a higher measurement range if applicable.
- Pantalla parpellejant: Ensure stable power supply and check for any loose connections or cold solder joints.
11. Manteniment
- Keep the voltmeter clean and dry.
- Eviteu exposar el dispositiu a temperatures o humitat extremes.
- Do not attempt to repair complex internal issues unless you are a qualified technician.
12. Garantia i Suport
This DIY kit is intended for educational and hobbyist use. Due to the nature of DIY assembly, specific warranties may vary. For technical support or inquiries, please contact the seller directly.
13. Recursos addicionals
A detailed user manual in PDF format is available for further reference. You can access it here: ICL7107 Voltmeter User Manual (PDF)
