The 4-Digit Stopwatch DIY Kit is a compact electronics module designed for building a digital stopwatch or event counter. The circuit uses CD4026 decade counter and 7-segment driver ICs to display numbers from 0000 to 9999 on bright LED displays.
A 555 timer IC generates stable clock pulses for continuous counting, while onboard pause and reset buttons allow easy control of the counter. The kit operates from a regulated 5V supply using a 7805 voltage regulator, ensuring reliable and stable performance.
 
This kit is ideal for electronics students, hobbyists, and STEM learning, helping users understand digital counters, timing circuits, and display driving techniques.
 
Specifications
Display Type: 4-Digit 7-Segment LED
Counting Range: 0000 – 9999
Main ICs: CD4026 (counter/7-segment driver), NE555 timer
Voltage Regulation: 7805 voltage regulator
Operating Voltage: 5V DC
Dimensions: 8.6 cm × 5 cm
 
Key Features
4-digit LED display for clear numeric output
Pause button to temporarily stop counting
Reset button to return display to 0000
Stable clock pulses generated by NE555 timer
Built-in 7805 regulator for stable 5V operation
Compact and easy-to-assemble design