Crystal Radios (was Re: List spammer ID'd)

Hi One other thing that one can do to improve the sensitivity of a crystal set is to slightly forward bias the diode. I used a 100K pot across a 1.5 volt battery. I used a 10K isolation resistor and used a blocking capacitor when using a dynamic head phone. I also made traps for the strong stations ( I had two that were real close ) so that I could get some of the weaker ones. I also found an old scrap radio that used a TRF front stages. I used this to make a two stage tuner that improved the selectivity quite a bit. I wish I'd save some of this stuff but it always seemed like the next project needed the parts used in the first. My favorite was a short wave regenerative set made with a dual triode. I got the schematic from the "Boys Life" magazine ( Boy Scout magazine ). Dwight