Stages

11-5Smooth, Then RegulateMake 5 V for the microcontroller from AC—and hold it for 3 seconds without a single dip

Power off

Parts

  • Electrolytic capacitor (pick capacitance and rating) (choose one)1/1 left

Goals

  • Keep 5 V on U1 for 3 seconds (4.75–5.25 V)

Rules

  • Don't reverse or overvolt the capacitor
  • Don't burn out the diodes
  • Don't put more than 6.0 V on U1
  • No short circuits
Transformer 9 V12.7V 1Hz7805INOUTGND132U2MCU U1GNDVCC

Selected

Press a terminal (the small ◯) to start a wire. Press where you want to bend to place corners, and finish on another terminal or on a wire. Press the middle of a wire and then somewhere else to draw a branch from there. You can drag parts and wires to move them. When you are ready, press "Run!" to turn on the power, and try the switches while it is on.

Line mode

Keys

W
Draw wire
R
Rotate
M
Move
G
Drag
Del
Delete
⌘Z
Undo
⌘⇧Z
Redo
Enter
Run
Home
Fit
H
Hint

Wheel to zoom, right-drag to pan