4 ms·
cat whisker detector
by artificialidiot 7y ago
cat whisker detector
- dublin 7y agoThis one just requires a lump of germanium and a pin or small wire.
- stan_rogers 7y agoTraditionally, one would have used galena (natural lead II sulfide) crystals. I also recall most "boys'" radios - the type you'd find in Cubs/Scouts/etc. handbooks - using a razor blade as the contact whisker, probably because it was the simplest way to get a small contact point and stiffness at the same time with materials a kid would likely have to hand.