BUILD CARD · EASY
Pushbutton Fan
A momentary-control variation of manual Projects 8 and 9 for the motor and fan.
- Time
- 15 min
- Age
- 8+
- Pieces
- 6
- Board
- 10×7
- Build and check a 10×7 snap-grid circuit from a visual diagram.
- A momentary switch gives direct, press-and-hold control of the fan motor.
02 / PARTS CHECK
Parts list
- 1×7-snap wireconnector
- 2×3-snap wireconnector
- 1×Motoroutput
- 1×Press switchswitch
- 1×3V two-cell battery holderpower
03 / ASSEMBLY
How to build the circuit
- 1
Disconnect the battery and clear the base grid before placing any part.
- 2
Match the final diagram one grid position at a time, placing connecting wires and lower layers first.
- 3
Check the direction of every LED, diode, transistor, battery, and other terminal-sensitive part.
- 4
Press every shared snap firmly, check that no wire shorts the battery, then connect power last.
04 / FIELD NOTES
How it works
Pressing the switch completes the motor circuit.
Current creates magnetic force inside the motor.
Releasing the button removes power and the fan coasts down.
Explore more motor circuit projects →
05 / TEST
Test and expected result
- What to do
- Hold the button until the fan reaches speed, then release it.
- What to expect
- The motor runs while pressed and coasts after the circuit opens.
06 / SAFETY
Build smart
- Use only the 3V two-cell battery holder.
- Never connect the battery terminals directly together.
- Disconnect the battery before moving any component.
- Keep fingers, hair, and loose objects away from the fan.
07 / TROUBLESHOOTING
If it does not work
- Press every overlapping snap down firmly.
- Check the battery direction and replace weak batteries.
- Compare every component position with the final diagram.
08 / FREQUENTLY ASKED QUESTIONS
Questions about this circuit
What is the main idea behind this circuit?
A momentary switch gives direct, press-and-hold control of the fan motor.
What should I check first if it does not work?
Press every overlapping snap down firmly.
09 / RELATED BUILDS
Try a similar circuit
Continue with another build that shares the same components, ideas, or difficulty.
