DIY Calculator Soldering Kit

DESCRIPTION

The DIY Calculator Soldering Kit combines classic arithmetic with electronics engineering skills — solder together a fully working desktop calculator capable of far more than basic maths. It's a rewarding build for students, hobbyists, and electronics enthusiasts who want hands-on soldering practice with a genuinely useful end result.

Beyond standard arithmetic, this calculator can perform square roots, convert between decimal and hexadecimal, and even calculate resistor values directly from colour bands — making it a handy reference tool on any electronics workbench.

Note: All components shipped unassembled; soldering required.

FEATURES

• Full through-hole soldering kit for a working desktop calculator
• 7-digit green LED display for clear readouts
• Standard arithmetic: addition, subtraction, multiplication, division (with decimals and negative numbers)
• Square root function
• Decimal-to-hexadecimal and hexadecimal-to-decimal conversion
• Built-in 4-ring and 5-ring resistor colour code calculator
• Transparent shell shows off the assembled circuit board
• Auto power-off after 30 seconds of inactivity

APPLICATIONS

• STEM and electronics education in schools and enrichment centres
• Soldering practice for beginners and hobbyists
• Handy resistor colour code reference tool for the workbench
• Maker club and workshop group projects
• Everyday calculator with electronics-focused bonus functions

TECHNICAL DETAILS

• Display: 7-digit green LED display
• Control Chip: STC8G1K17 + TM1638
• Power Supply: 2x AAA batteries (3V)
• Power Button: Press and hold [ON] for approximately 1 second
• Auto Power-Off: After 30 seconds of inactivity
• Maximum Result: Up to 7 digits (including sign)
• Base Conversion Range: Decimal (up to 65535) / Hexadecimal (up to FFFF)
• Resistor Conversion Range: 0.10 MΩ – 1000 MΩ
• Material: PS transparent plastic shell
• Dimensions: 121mm (L) x 73mm (W) x 28mm (thickness)

SHIPPING LIST

• 1x DIY Calculator Soldering Kit (unassembled PCB & components)
• 1x Transparent Plastic Shell