Do you mean these quartzes?

http://www.raltron.com/products/..._45_51.pdf

They seem to be pretty good. Choose a HC-49/U package, these types show the lowest dampening.


Using special external clock oscillator modules isn't necessary in very most cases, exotic applications excluded. What I meant by "built-in Pierce oscillator" is just the oscillator of the micro itself. They already contain a built-in oscillator, which is designed as "Pierce oscillator".

One further hint: Do not follow the recommendation about burden capacitors the manufacturer of quartz gives. This recommended burden capacitance only tells, what is recommended to exactly get the stamped-on frequency.
Follow more the recommendation of manufacturer of micro, because he designed the Pierce oscillator, and when he tells, that 27pF...33pF is a good choice, then this tells you, that the oscillator will work properly in terms of good start-up performance and good tolerance with high ambient temperature changes. In most cases burden capacitors recommended by manufacturer of crystal and manufacturer of micro will be identical anyway. But sometimes crystal manufacturer gives a rather broad range of burden capacitors to combine with the crystal, for instance 5...33pF. Then choosing 5pF will not make the job, if manufacturer of micro recommends 27...33pF!

As Steve already mentioned: Remove the etch resist very carefully! Take soft toilet-paper and remove the resist with acetone (like Steve already recommended) as long as you can see any resist colour on the paper. Then I often take (better took, because I do not fabricate PCBs by hand any more) a special rubber called 'senobloc' to make an oxide free surface. Directly afterwards I put the board into a tinning bath (must be a good one, otherwise solder problems come again).

Again: Remove the etch resist totally before soldering!!

Kai