At what angle must a quarts crystal be cut to make a radio crystal.?

Question

In a book on minerals I read that quarts crystal was once used to make radio crystals, but when I researced radio old and new I found no knowledge of it. Can you help?

Answer 1

there are three principal ways in which a quartz crystal can vibrate, that is through the piezoelectric effect either receive a charge (radio receiver (Rx)) or give off a charge (radio transmitter(TX)). the three main modes for the quartz crystal vibration are , the longitudinal mode, low frequency face shear mode, and high frequency shear mode. the most common cut of a radio quartz crystal is know as the AT cut, which employs the high frequency shear mode of vibration. where A is the angle of the cut from the normal crystal axis, and typically varies from -4 to 10 degrees. these crystals will look, when cut like a thin rectangular shape.

Answer 2

once you're making a common crystal radio and for the detector employ a voltage multiplier, you may strengthen sufficient voltage - yet an LED also calls for present day. so that you'll might want to trickle-cost up an greater capacitor to then discharge into the LED. good luck, it appears like an exciting challenge to attempt!

Answer 3

I know it the crystal needs to be cut in a thin slice lengthwise along the Basel.