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A charming beginner soldering project that makes a great gift — solder together this heart-shaped LED kit and watch 18 colourful LEDs flash in a rotating clockwise pattern, driven by a classic transistor oscillator circuit.
It's a satisfying build that teaches real electronics fundamentals: transistor switching, capacitor charging, and LED sequencing — all in a visually rewarding package.
How it works
Three transistors (Q1, Q2, Q3) take turns switching on, each driving a group of 6 LEDs arranged in the heart pattern. Capacitors control the timing between each group, creating a continuous rotating flash effect. At any moment, two of the three groups are lit — giving the heart a lively, animated glow.
Specs
LEDs: 18 (3 groups of 6, cross-arranged in heart pattern)
Operating Voltage: 5V USB
Circuit: Transistor oscillator (no microcontroller needed)
