“Step 5: What If the Circuit Doesn’t Work? First, check whether the circuit works without the capacitor. If not, then go back to Step 1 and get the LED circuit working before you move forward. If the LED lights up with the battery connected but turns off the instant you remove the battery, then something is wrong with the capacitor part of your circuit. Check that the capacitor’s positive leg is connected to the positive battery leg (row 1 in the photo) and that the other leg is connected to the negative battery leg (row 10 in the photo). If the circuit looks correct, confirm that the capacitor value is at least 1000 µF; the value should be written on the capacitor. If it’s less than 1000 µF, try a bigger capacitor.”