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March 3, 2007
about 4 years ago
This is an alternative to a 20 MHz quartz crystal. It is used exactly the same way, except the typical load capacitors are built in. Instead of quartz being used for the frequency reference, it uses ceramic. It does not generate or pickup audio in the human range, but it might be sensitive to audio at 20 MHz. Compared to a quartz crystal frequency reference, these have much poorer initial frequency specification (parts per 1000 (ppt) vs parts per million (ppm) ) but are specified to operate over a wider temperature range and drift less over that range than quartz crystals. They are also cheaper and smaller.
Tutorial - Digital Caliper Battery Hack
about 8 years ago
I documented my research on this back in 2005 in the alt.machines.cnc news group.
You can find a copy here: http://www.fliptronics.com/tip0006.html
No public wish lists :(