Electronics World articles Popular Electronics articles QST articles Radio & TV News articles Radio-Craft articles Radio-Electronics articles Short Wave Craft articles Wireless World articles Google Search of RF Cafe website Sitemap Electronics Equations Mathematics Equations Equations physics Manufacturers & distributors Engineer Jobs LinkedIn Crosswords Engineering Humor Kirt's Cogitations RF Engineering Quizzes Notable Quotes Calculators Education Engineering Magazine Articles Engineering software RF Cafe Archives RF Cascade Workbook 2018 RF Symbols for Visio - Word Advertising RF Cafe Forums Magazine Sponsor RF Cafe RF Electronics Symbols for Visio RF Electronics Symbols for Office Word RF Electronics Stencils for Visio Sponsor Links Saturday Evening Post NEETS EW Radar Handbook Microwave Museum About RF Cafe Aegis Power Systems Anritsu Alliance Test Equipment Amplifier Solutions Anatech Electronics Axiom Test Equipment Berkeley Nucleonics Bittele Centric RF Conduct RF Copper Mountain Technologies Empower RF everything RF Exodus Advanced Communications Innovative Power Products ISOTEC KR Filters Lotus Systems PCB Directory Rigol RF Superstore San Francisco Circuits Reactel RFCT TotalTemp Technologies Triad RF Systems Windfreak Technologies Withwave LadyBug Technologies Wireless Telecom Group Sponsorship Rates RF Cafe Software Resources Vintage Magazines Thank you for visiting RF Cafe!

Crystal Equivalent Circuit - RF Cafe Forums

RF Cafe Forums closed its virtual doors in 2010 mainly due to other social media platforms dominating public commenting venues. RF Cafe Forums began sometime around August of 2003 and was quite well-attended for many years. By 2010, Facebook and Twitter were overwhelmingly dominating online personal interaction, and RF Cafe Forums activity dropped off precipitously. Regardless, there are still lots of great posts in the archive that ware worth looking at. Below are the old forum threads, including responses to the original posts.

NOTICE: The original RF Cafe Forum is available again for reading, and the new RF Cafe Blog is an active board.

-- Amateur Radio

-- Anecdotes, Gripes, & Humor

-- Antennas

-- CAE, CAD, & Software

-- Circuits & Components

-- Employment & Interviews

-- Miscellany

-- Swap Shop

-- Systems

-- Test & Measurement

-- Webmaster


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 Cascade Workbook 2018 - RF Cafe
Anritsu Test Equipment - RF Cafe
RF Superstore (RF Components) - RF Cafe
Innovative Power Products Passive RF Products - RF Cafe
Exodus Advanced Communications Best in Class RF Amplifier SSPAs

Please Support RF Cafe by purchasing my  ridiculously low−priced products, all of which I created.

These Are Available for Free


About RF Cafe

Kirt Blattenberger - RF Cafe Webmaster

Copyright: 1996 - 2024


    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 World Wide Web (Internet) was largely an unknown entity at the time and bandwidth was a scarce commodity. Dial-up modems blazed along at 14.4 kbps while tying up your telephone line, and a nice lady's voice announced "You've Got Mail" when a new message arrived...

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: