Schu Posted May 12, 2016 Share Posted May 12, 2016 Is this article correct about capacitance and inductance? http://www.wired.com/2016/05/go-ahead-connect-inductor-capacitor-see-happens/ Quote Link to comment Share on other sites More sharing options...
Don Richard Posted May 12, 2016 Share Posted May 12, 2016 The article assumes the reader has some advanced math in their background - the formulae are basic calculus and are correct. Other than that, it's a pretty good writeup. Quote Link to comment Share on other sites More sharing options...
mustang guy Posted May 12, 2016 Share Posted May 12, 2016 (edited) That crystal radio kit looks familiar. I had one when I was a kid. I remember it was came from ratshack. I'mm off to see if I can find the one I had in the online ratshack catalogs... I'm back... I'm pretty sure this is the one I had. I was 9: Edited May 12, 2016 by mustang guy 1 Quote Link to comment Share on other sites More sharing options...
Davecv41 Posted May 14, 2016 Share Posted May 14, 2016 I had a similiar Rat Shack xtal radio when I was a kid, and still have it. Probably the best $2.99 gift I've ever gotten. A book called Batteries and Bulbs II that I saw in 5th grade had variable capacitors made out of book sized cardboard covered with 2 pieces of aluminum foil and waxed paper as an insulator. The simple radios I made always worked, but I can't quite follow the magnet wire the author of the article used in his to try to reverse engineer his circuit. It's possible he didn't use a germanium diode, and I've found that crystal earphones oxidize inside and cease to work. Quote Link to comment Share on other sites More sharing options...
babadono Posted May 14, 2016 Share Posted May 14, 2016 Is this article correct about capacitance and inductance? Yep. Quote Link to comment Share on other sites More sharing options...
Paducah Home Theater Posted May 14, 2016 Share Posted May 14, 2016 This seems to be a classic fascination of instructors and textbook writers, we had a similar introductory lesson on such things back in engineering school. Quote Link to comment Share on other sites More sharing options...
pzannucci Posted May 14, 2016 Share Posted May 14, 2016 (edited) A couple of good pages: http://www.sayedsaad.com/fundmental/16_CAPACITIVE%20REACTANCE%20.htm - capacitive reactance http://www.sayedsaad.com/fundmental/ - electronic fundimentals Almost every kid back in the 50's and 60's built their own radio. Seemed like the thing to do. Edited May 14, 2016 by pzannucci 1 Quote Link to comment Share on other sites More sharing options...
djk Posted May 14, 2016 Share Posted May 14, 2016 Parallel caps go to infinity (think of the P-trap), series go to zero (JBL 4425, 30, 35, etc. networks). Quote Link to comment Share on other sites More sharing options...
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