Archive for gennaio, 2019

Normally close reed switch

by on Gen.17, 2019, under Hardware lab

There are a lot of different magnetic reed switches but by far the more common is the normally open version. Normally it’s on open circuit that closes when you put a magnet near it, and the led shines. The north-south axis of the magnet should be parallel to the axis of the reed and placed near the center.


One day I needed one that acted the opposite way: Normally it must be a closed circuit that opens when a magnet comes near. You can buy it right away but i didn’t want to wait.


By placing a second magnet oriented the opposite way the switch opens because it cancel out the magnetic field in the middle. So one magnet must be fixed to close the switch and when the other magnet comes near, it cancel the field and open the switch. Day saved. Zaion.


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Remote controller repair – granny style

by on Gen.05, 2019, under Hardware lab

Sometime a button on your remote controller stop working and so you need to fix it. Usually there is nothing really broken, just the rubber conductive pad are worn out and no longer close the circuit.

remoteControlI tried with some graphite powder but it’s not long lasting. Gluing a square aluminium foil on top is difficult because you need to have the right adhesive otherwise it will fall out.

The solution was to use a mechanical way to secure some conductive material, in this case I pocked two holes under the pad with a needle and then threaded in a thin copper wire. It really is simple and reliable. Zaion.


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