"Jim Thompson" wrote
in message ...
Anyone have good guess for the capacitance of a 1" diameter piezo
disk?

Likewise, how much capacitance in around 100' of typical telephone
twisted pair?


Some call the cable Cat1, but TIA never catagorized anything below Cat3.
So 100ohm would be a good guess with out looking up the mfg specs.

Heres the Beldin wire data sheet..
https://edeskv2.belden.com/Products/index.cfm?event=printPrev&pnum=STBLK22&ut=english

Some vague references to 40 - 50nF / km for 24-26awg TP wire, on the
telecom sites.
http://books.google.com/books?id=K4ribVEOhSAC&pg=PA806&lpg=PA806&dq=50nF/mile&source=bl&ots=JT5nKQ8tHC&sig=N6Fd4xlipKs2f1He W327W8tlRKg&hl=en&ei=DHZgTcmNM8eugQfjx-HmAg&sa=X&oi=book_result&ct=result&resnum=1&ved=0C BMQ6AEwAA#v=onepage&q&f=false


Cheers