Technology 15 May 2019 By Hannah Joshua What you need: As required for Electric candle, plus: Advertisement Piezo buzzer Previously, we gained mastery over light and the basics of circuits. As your devices get more complex, it will make life a lot easier if you can turn the circuit on and off without dismantling it. That means adding a switch. Switches come in many flavours, depending on what you want them to do. But what they all have in common is that they make or break a circuit, … Continue reading Subscribe for unlimited digital access Subscribe now for unlimited access Digital Unlimited web access New Scientist app Videos of over 100 science talks available exclusively to subscribers SUBSCRIBE AND SAVE Print & digital Unlimited web access Weekly print edition New Scientist app Videos of over 100 science talks available exclusively to subscribers SUBSCRIBE Quarterly by Direct Debit Inclusive of applicable taxes (VAT) Existing subscribers, please log in with your email address to link your account access.