Level: Next step

Touch to activate

Your finger on the X Junction pads passes a tiny current into the transistor base.

Open in the 3D builderReserve a kit
+−3V220ΩNPNNPN
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

Press and hold the X Junction.

Blocks you need