02-11-2012, 06:21 AM
(02-11-2012, 03:38 AM)Pickle Wrote: In the 1930s to 1950s, it was fairly common for people to adjust the frequency of the crystals by manual grinding. The crystals were ground using a fine abrasive slurry, or even a toothpaste, to increase their frequency. A slight decrease by 1–2 kHz when the crystal was overground was possible by marking the crystal face with a pencil lead, for the price of lowering the QI'm asking agian: What tool are you using to observe their frequencies?
The only way I can get one of my crystals to put out a different frequency is to heat them or change their shape.