Solarwind, Go to the library, or your local ham radio store, and get a copy of THE RADIO AMATEUR's HANDBOOK. That has the info you're looking for, plus about 2 tons more. You'll use it often. The last time I bought a copy, they were about $30.00 or $35.00 USD. Jim KA9QHR -----Original Message----- From: piclist-bounces@mit.edu [mailto:piclist-bounces@mit.edu] On Behalf Of solarwind Sent: Wednesday, February 18, 2009 6:51 PM To: Microcontroller discussion list - Public. Subject: [EE] Crystals and Oscillators I've been trying to learn about the different kinds of oscillators and I couldn't find any good information on it. (If anyone has any info/links, please post). So what's the difference between a plain crystal (http://www.futurlec.com/ICCrystalsMain.shtml) and a crystal oscillator (http://www.futurlec.com/ICCrystalsOscillators.shtml)? I am trying to build a 1 Hz pulse using a 32768 Hz crystal and a divider IC, but I have very little knowledge on the subject. A whole bunch of questions about crystals, RC oscillators and other oscillators and don't know where to find the answers. -- solarwind -- http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist -- http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist