3 ms·
You just need a long piece of wire, diode, ferrite coil wth wire wrapped around, variable resistor and old style ear piece to pick up am radio. No batteries req
by p0d 8y ago
You just need a long piece of wire, diode, ferrite coil wth wire wrapped around, variable resistor and old style ear piece to pick up am radio. No batteries required. I can remember my son’s lack of interest while we made the venerable crystal radio and then his little fascinated face when we picked up some signals
- Johnythree 8y agoNo, not a variable resistor, but variable capacitor. Do a google search on "Crystal Set", or go to http://theradioboard.com/rb/index.php http://theradioboard.com/rb/index.php