Tuesday, 8 October 2019

capacitor - Tuning simplest FM to 93.5MHz


radio


FM Crystal Radio


L - 4 turns #18 copper or silver wire, 12mm inside diameter, tapped at 2.5 turns


Ant - 7 inches of #18 bare copper wire


C1 - 18 pF ceramic capacitor


C2 - 50 pF air variable capacitor (? for 93.5MHz)


D - 1N34 diode or rock crystal



R - 150K resistor




  1. How to tune simplest FM at 93.5MHz radio station by fixed value of C1 (18pF), C2? (any formula would very helpful so that I can tune to any radio station)




  2. Can I use diode 1N4007 instead of 1N34?






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