please dont rip this site

Processor Clock Oscillator Crystals

Calculating crystal loading resistance.

Andre Abelian [engelec@EARTHLINK.NET] says:

  1. connect 1k pot serially.
  2. you need a scope to measure the sinusoid signal.
  3. you must know that in the probe you have a capacitor about 15-45 pf when you probe it will add that value to it and it may shift the wave form
  4. if you can not get a probe without the cap in it then use 2 same probes by connecting on both crystal pins this way it will add equal values on both crystal pins witch is much safer or if you already know the value of your probe add an other cap on the other side.
  5. slowly turn the pot until you get sharp signal
  6. once you got good signal check the value of the pot and match with closest resister you can get a few ohms + - may not even affect .

I did this once using 4 mhz crystal up to 200 ohms I didn't even see any changes. I ended up with 820 ohm.

See also:


file: /Techref/osccr.htm, 1KB, , updated: 2009/2/6 12:04, local time: 2021/10/21 02:04,
TOP NEW HELP FIND: 
3.238.232.88:LOG IN

 ©2021 These pages are served without commercial sponsorship. (No popup ads, etc...).Bandwidth abuse increases hosting cost forcing sponsorship or shutdown. This server aggressively defends against automated copying for any reason including offline viewing, duplication, etc... Please respect this requirement and DO NOT RIP THIS SITE. Questions?
Please DO link to this page! Digg it! / MAKE!

<A HREF="http://www.piclist.com/techref/osccr.htm"> Calculating crystal loading resistance.</A>

After you find an appropriate page, you are invited to your to this massmind site! (posts will be visible only to you before review) Just type a nice message (short messages are blocked as spam) in the box and press the Post button. (HTML welcomed, but not the <A tag: Instead, use the link box to link to another page. A tutorial is available Members can login to post directly, become page editors, and be credited for their posts.


Link? Put it here: 
if you want a response, please enter your email address: 
Attn spammers: All posts are reviewed before being made visible to anyone other than the poster.
Did you find what you needed?

  PICList 2021 contributors:
o List host: MIT, Site host massmind.org, Top posters @20211021 Neil, Harold Hallikainen, Alan Pearce, RussellMc, Bob Blick, Allen Mulvey, Dwayne Reid, madscientistatlarge, Sean Breheny, Justin Richards,
* Page Editors: James Newton, David Cary, and YOU!
* Roman Black of Black Robotics donates from sales of Linistep stepper controller kits.
* Ashley Roll of Digital Nemesis donates from sales of RCL-1 RS232 to TTL converters.
* Monthly Subscribers: Gregg Rew. on-going support is MOST appreciated!
* Contributors: Richard Seriani, Sr.
 

Welcome to www.piclist.com!

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

  .