Level: Next step

Switching with a transistor

A tiny current through the base turns on the LED.

Open in the 3D builderReserve a kit
+−3V220Ω10kΩNPNNPN
ReadyPress and hold the buttonThis circuit waits for you. Press and hold the push button (or the touch pads on the X Junction).

Try this

Hold the button. The 10 kΩ resistor protects the base.

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