3 ms·
These have existed for a while [1]. I've been using one to make sure that my business and personal cards aren't both charged in public transport [1] https://ww
by misterdata 10y ago
These have existed for a while [1]. I've been using one to make sure that my business and personal cards aren't both charged in public transport
[1] https://www.secrid.com/en/ https://www.secrid.com/en/
- Kubuxu 10y agoYou don't need an expensive wallet, strip of aluminium foil works as great. NFC uses magnetic antennas/coupling meaning that shielding from one side is enough to block signal. My solution is to laminate strip of aluminium foil in card form factor.
- kalleboo 10y agoMore on this from Dave Jones at the EEVBlog where he actually tests the attenuation and visualises on an oscilloscope: https://www.youtube.com/watch?v=kp63MZ6RudE https://www.youtube.com/watch?v=kp63MZ6RudE As well as testing an active jammer that's for sale https://www.youtube.com/watch?v=rnOuEFR6qoM https://www.youtube.com/watch?v=rnOuEFR6qoM