EEVblog #1089 - XTAL Oscillator Teardown - Page 1
Forum section: electronics / general

author: EEVblog
author_rank: Unknown
timestamp: May 28, 2018, 11:05:05 pm
content: What's inside a DIP crystal oscillator module?A 2 minute teardown turns into 17 minutes, because, well, it's Dave. Includes a revisit of the bypass capacitor video.

author: kcozens
author_rank: Contributor
timestamp: May 29, 2018, 01:04:41 am
content: Hm... I get first post?I have used these devices for years but never stopped to think of what is inside one of these devices so this video was very interesting to watch. I did some digging around and I found a datasheet for the IC used in the small square oscillator package. The part number is SM5613N1. You can see the datasheet for it athttp://www.digchip.com/datasheets/download_datasheet.php?id=877041&part-number=SM5613N1

author: SNGLinks
author_rank: Regular Contributor
timestamp: May 29, 2018, 09:03:31 am
content: The reason they use a 8 MHz xtal and divide down is that a 1 MHz xtal would be too large to fit in the package.

author: EEVblog
author_rank: Unknown
timestamp: May 29, 2018, 12:02:26 pm
content: Quote from: wilfred on May 29, 2018, 11:22:49 amIt's not a 32KHz crystal, it's in the MHz range.32KHz watch crystal use a tuning fork style.QuoteOscillators will generally have a higher frequency divided down, so EMC issues, and potentially consume more power.Oscillators are easier to implement in a system.

author: mikerj
author_rank: Super Contributor
timestamp: May 29, 2018, 09:20:33 pm
content: I'd have thought the springs were to reduce stress on the crystal e.g. due to differential expansion over temperature. The crystal looks a bit too light for those springs to absorb much of a shock.

author: coldfiremc
author_rank: Regular Contributor
timestamp: May 29, 2018, 10:34:39 pm
content: If this is a kind of colpitts oscillator, I really miss the other capacitor. Is inside that IC? is this another circuit?

author: Fungus
author_rank: Super Contributor
timestamp: May 30, 2018, 05:31:30 am
content: Quote from: EEVblog on May 29, 2018, 12:02:26 pm

author: @rt
author_rank: Super Contributor
timestamp: May 30, 2018, 05:37:14 am
content: A vintage radio crystal I recently pulled apart used a very heavy springto push each electrode very tightly against the crystal wafer.Only the disassembly releases the tension of the spring.I can’t really tell if that’s what’s happening there.

author: RoGeorge
author_rank: Super Contributor
timestamp: June 01, 2018, 08:39:23 am
content: I remember on the youtube page of this video two very, very long comments from somebody who worked in the Xtal manufacturing industry. He was talking about interesting techniques, with lots of hands on experience and historic details. It was the first comment, with a few hundreds thumbs up.I still get notification from Youtube about replies to those long comments, but if I open the youtube page, I can not find that comment any more. Tryed another browser, no cookies , logout from youtube but with no luck finding those comments again.Is it something wrong with the youtube site, or those comment were deleted? Can anybody else see those two long comment, please?

author: glarsson
author_rank: Frequent Contributor
timestamp: June 01, 2018, 09:08:09 am
content: This film about xtal manufacturing is old but the advantage is that you can actually see the steps needed.https://youtu.be/b--FKHCFjOM

author: thm_w
author_rank: Super Contributor
timestamp: June 01, 2018, 09:20:40 pm
content: Quote from: RoGeorge on June 01, 2018, 08:39:23 amhttp://ytcomments.klostermann.ca/scrapeI don't see it with this tool, could be deleted or could be youtubes comment system being terrible as usual.

author: TheNewLab
author_rank: Frequent Contributor
timestamp: June 03, 2018, 01:47:28 am
content: Has anyone tried to run the XTAL after opening it up?? or desolder that IC and use it on another circuit? humm, Should I try that? or remove the crystal and see it anyone can get it to work? That last one may being heading into impossible...

author: modernstyle
author_rank: Newbie
timestamp: January 19, 2020, 09:02:46 am
content: Quote from: thm_w on June 01, 2018, 09:20:40 pmThis tool doesn't seem to work anymore and the dev says there's no future support coming.Here's an alternative:https://seobots.io/bots/youtube-comment-scraper