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