heating pad- material experiment

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When current go through, some conductive materials will also turn warm or even hot, so I tried different kinds of materials and look for a best which can make a heating pad. The red paper will turn white when it feels hot. 1.conductive thread knitting mit common thread. resistance :  about 11 Ω when voltage is […]

Nerdy speakers

How to Make Piezoelectric Crystal Speaker Very nerdy.. a lot of work to nicely wake up in the morning. If you want to try the way he is showing.. be very very careful with the transformer.. and here is Homemade Piezoelectric Transducer

Push Button

This is a push button. The following is the data-sheet.   After the four black point was cutted, metal panel and the button cylinder were apart and there’s a round panel inside. When push the round panel, it links the metal part in the mittel and the two side metal parts. That’s how does it […]

Tilt Switch

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Tilt Switch actually just work as a simple switch to make open and closed circuit. Open a tilt switch, we can see there are to conductive balls inside a copper tube. There are two pins with this switch, one connected to the outer copper tube, and another one go into the tube and which would […]

DIY Magnetic Motor

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  The original idea is to build a motor with soft linear material at sides which could be held and turning in hand . To build a motor you need to roll the surface-isolated wire into spiral, and its important to make sure that you make the spiral as a continual circle which means you […]

a course at eLab KHB SS14