Electronics World Cover,TOC,and list of posted Popular Electronics articles QST Radio & TV News Radio-Craft Radio-Electronics Short Wave Craft Wireless World About RF Cafe RF Cafe Homepage RF Cafe in Morse Code Google Search of RF Cafe website Sitemap Electronics Equations Mathematics Equations Equations physics Manufacturers & distributors Engineer Jobs Twitter LinkedIn Crosswords Engineering Humor Kirt's Cogitations Engineering Event Calendar RF Engineering Quizzes AN/MPN-14 Radar 5CCG Notable Quotes App Notes Calculators Education Magazines Software,T-Shirts,Coffee Mugs Articles - submitted by RF Cafe visitors Simulators Technical Writings RF Cafe Archives Test Notes Wireless System Designer RF Stencils for Visio Shapes for Word Search RF Cafe Sitemap Advertising Facebook RF Cafe Forums Thank you for visiting RF Cafe!

Crystal Equivalent Circuit - RF Cafe Forums

The original RF Cafe Forums were shut down in late 2012 due to maintenance issues. Original posts:

Amateur Radio | Antennas | Circuits & Components | Systems | Test & Measurement

Post subject: Crystal Equivalent Circuit Posted: Tue Jul 08, 2008 6:42 pm


Joined: Tue Feb 27, 2007 6:16 am
Posts: 46

I wish to design and simulate a crystal oscillator. I have been having great difficulty obtaining typical crystal equivalent circuit values for whatever frequency.

Can anyone suggest a manufacturer that lists the equivalent circuit values for each of their crystals?

Other than measuring the values, is there an easier way of obtaining typical crystal equivalent circuit values?


Regards, Darcy Randall, Perth, Western Australia


Post subject: Posted: Wed Jul 09, 2008 4:12 am


Joined: Fri Feb 17, 2006 12:07 pm
Posts: 218
Location: London UK
Hi Darcy
you will find the equivalent circuit and much useful data on www.euroquartz.co.uk


Post subject: Posted: Wed Jul 09, 2008 11:40 am


Joined: Tue Jul 08, 2008 7:15 pm
Posts: 11
Location: Boulder Colorado
Hi Darcy,

Most manufacturers will specify Rm (series resistance at resonance), Co (holder capacitance) and of course Fo, so all you really need to complete basic model is either Cm, Lm or Q. Frerking lists the following typical Qs:

200 KHz Fundamental - 18e3
2 MHz Fundamental - 54e3
30 MHz 3rd Overtone - 1e5
90 MHz 5th Overtone - 85e3

Many manufacturers will allow you to specify Cm or Lm, but this is not typically specified on data sheet since it makes little difference for clock oscillator, where most crystals are used, and it would add cost to actually measure it in manufacturing.

Hope this helps.


Post subject: Posted: Wed Jul 09, 2008 6:35 pm


Joined: Tue Feb 27, 2007 6:16 am
Posts: 46
Very Helpful, I have what I need. Cheers

Regards, Darcy Randall, Perth, Western Australia


Post subject: Posted: Thu Jul 10, 2008 3:41 pm

Site Admin

Joined: Mon Jun 27, 2005 2:02 pm
Posts: 373
Location: Germany
Hi Darcy,

Try also Fox Elecctronics: http://www.foxonline.com/

They have detailed specifications for their crystals and good application notres on their website. I had the sdame problem as you and they helped me a lot.

Good luck!

Posted  11/12/2012

RF Cafe Software

   Wireless System Designer - RF Cafe
Wireless System Designer

RF & EE Symbols Word
RF Stencils for Visio
Calculator Workbook
RF Workbench
Smith Chartâ„¢ for Visio
Smith Chartâ„¢ for Excel

About RF Cafe

Kirt Blattenberger - RF Cafe WebmasterCopyright
1996 - 2022
Kirt Blattenberger,

RF Cafe began life in 1996 as "RF Tools" in an AOL screen name web space totaling 2 MB. Its primary purpose was to provide me with ready access to commonly needed formulas and reference material while performing my work as an RF system and circuit design engineer. The Internet was still largely an unknown entity at the time and not much was available in the form of WYSIWYG ...

All trademarks, copyrights, patents, and other rights of ownership to images and text used on the RF Cafe website are hereby acknowledged.

My Hobby Website:

Try Using SEARCH
to Find What You Need. 
There are 1,000s of Pages Indexed on RF Cafe !