View single post by Slider2732
 Posted: Aug 30th, 2012 09:51 PM
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Joined: Mar 3rd, 2008
Location: Muskogee, Oklahoma USA
Posts: 349
Thanks Joe..kinda spendy at $6.84, but at least they do have them :)

I'm growing piezo crystals at the moment, in the hopes of making an earphone in the future (Baking Soda/Cream of Tartar method). But, more realistically, am looking at piezo flat buzzers from greetings cards etc. Will build an enclosure and see how it goes.
Just tried out a crystal radio build and the original telephone handset speaker works fine, so am going to use that for the meantime.

Does anyone know what the original core for the coils was made of ?
I'm going to be using ferrite, larger than the original coils above for more turns...but just wondered if it was indeed ferrite on the original.