SNAP · SWITCH · SHINE
Electronic circuits
for young builders.
Hands-on projects for ages 8–10+: follow each visual circuit diagram, test the finished build, and discover why electricity behaves the way it does.
READY
01 / PROJECT LIBRARY
Pick your next experiment
Every diagram is checked against its snap grid before publishing.
Adjustable Night-Light Threshold
Replace the fixed bias resistor with a variable resistor to choose how dark it must be before the LED turns on.
Two Lamps in Parallel
Connect two lamps across the same two supply rails and compare them with the series version.
Two Lamps in Series
Place two identical lamps in one current path and compare their brightness with a parallel circuit.
LED Polarity & Current Limiting
Build a protected LED loop and learn why both polarity and a series resistor matter.
LED Reverse-Polarity Test
Reverse the protected LED and observe that polarity controls whether it can light.
Photoresistor Night Light
Use a light-dependent voltage divider and an NPN transistor to turn an LED on in darkness.
Press Switch LED
Make a white LED light only while you hold down the press switch.
Protected Transistor Motor Driver
Add a reverse-biased diode across the motor to give inductive turn-off current a safer path.
Reed Switch LED
Use a magnet-operated reed switch to control a white LED without touching the circuit.
Slide Switch LED
Build a white LED circuit that turns on when you close the slide switch.
Switch-Controlled Lamp
Build a simple loop in which a slide switch turns a small lamp on and off.
Transistor Motor Driver
Use a press switch and small base current to let an NPN transistor control a motor load.
Vibration Switch LED
Create a movement-sensitive circuit that flashes a white LED when the switch is shaken or tapped.
Blue LED Switch Light
Replace the color LED in manual Project 2 with a blue LED and keep the current-limiting resistor.
Hear the Motor
Recreate manual Project 30 by putting a motor and speaker in the same current path.
Lamp and Fan in Parallel
Recreate manual Project 29 with separate lamp and motor branches across the battery.
Lamp and Fan in Series
Recreate manual Project 27 with the lamp and motor sharing one current path.
Morse Code LED
A safe LED variation of manual Project 103 for practicing short and long light pulses.
Motor Sound with LED
A protected LED variation of manual Project 31 that makes motor-current changes visible.
Musical Doorbell
Recreate manual Project 5 with a press switch, music IC, and speaker.
Photoresistor Lamp Dimmer
Recreate manual Project 28 by placing a photoresistor in series with the lamp.
Phototransistor LED Control
Recreate manual Project 43 with a phototransistor controlling a protected LED.
Pushbutton Color Light
A momentary-switch version of manual Project 2 with a protected color LED.
Pushbutton Fan
A momentary-control variation of manual Projects 8 and 9 for the motor and fan.
Pushbutton Electric Light
A pushbutton variation of manual Project 1 that lights the lamp only while pressed.
Magnetic Color Light
Bring a magnet near the reed switch to power the color LED safely.
Magnetic Reed-Switch Lamp
Replace the manual Project 1 slide switch with a magnet-operated reed switch.
Magnetic Motor Control
Start a motor by bringing a magnet near the reed switch.
Tilt-Activated Lamp
A position-sensitive variation of manual Project 1 using the three-terminal tilt switch.
Tilt-Controlled White LED
Change board angle to control a current-limited white LED.
Tap-Triggered Blinking LED
Tap the board to energize a blinking LED through a vibration switch.
Vibration-Activated Lamp
Use a vibration switch to flash a lamp when the board is tapped gently.
Tap-Triggered Motor
Use a vibration switch to pulse the motor when the board is tapped.
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