Philmore Crystal Radio Earphone to Stripped And Tinned Bare Wire, 7-Ft Cord, High Impedance 748

this is Billy today I'm going to test  all my gear box that I DIY all these   years and some approaches a lot of us has to  start with the year but before you can test   your crystal radio and the other thing you  need is a kind of transformer like this one   it's the step-down transformer to match the  impedance it's caused kbp KP p zero to its manufacturers in China you can see the chart  there we supposed the maximum impedance of 200   K down to the minimum of around to um for um so  you connect one wire to the ground zero arm and   the other wire to the impotence that matches the  output of your thyroids or crystal or most apt   most ability are used to run 5k diode I use five  K some crystal in other Tom may go up to 100 K and   for the output you connect one y of your iPad or  your phone to receive oh um a second wire to the   impedance matching your ether for mine I use five  hun