using crystal instead of resonator on RBBB

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yosh
Posts: 5
Joined: Tue May 12, 2009 4:08 am

using crystal instead of resonator on RBBB

Post by yosh » Mon Feb 28, 2011 8:55 am

hi, i bought 10 rbbb board thinking it would be easy finding a local supplier for the 16 MHZ ceramic resonators... guessed wrong.
searching online i see i can replace that with a slightly easier to locate crystals and a cap.
Option 1:
16MHz Ceramic Resonator Jameco# 324662

Option 2:
16MHz Crystal HC49/US Jameco# 325139
20pF Ceramic Disc Capacitors Jameco # 332321 (x2)
via http://www.arduino.cc/playground/Learning/Standalone

but im lacking the wiring diagram for that combo. any help welcome.

yair

floresta
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Location: Western New York, USA
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Re: using crystal instead of resonator on RBBB

Post by floresta » Mon Feb 28, 2011 10:22 am

You need a capacitor from each end of the crystal to ground. Paul has added pads for surface mount capacitors on the bottom of the BBB boards after Rev C or so, but the RBBB doesn't have much space so I doubt he has added them to the boards since I got mine. If you have to order parts anyway, and you don't need the added accuracy of a crystal, then you would be better off getting the resonators. I got some from DigiKey http://parts.digikey.com/1/parts/403831 ... -00mx.html.

Don

paul
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Joined: Mon May 12, 2008 4:19 pm

Re: using crystal instead of resonator on RBBB

Post by paul » Mon Feb 28, 2011 1:15 pm

Yosh,

I have both resonators and crystals up at moderndevice.com

http://shop.moderndevice.com/products/16-mhz-resonators
http://shop.moderndevice.com/products/1 ... capacitors

It isn't too bad a job to add a crystal on an RBBB with two .0603 sm caps on the bottom side of the board connected to the (otherwise unused) ground hole in the middle.

Hope that helps,

Paul

yosh
Posts: 5
Joined: Tue May 12, 2009 4:08 am

Re: using crystal instead of resonator on RBBB

Post by yosh » Mon Feb 28, 2011 1:31 pm

already bought from a different supplier at twice the price :(

flink
Posts: 1
Joined: Wed Aug 01, 2012 11:16 am

Re: using crystal instead of resonator on RBBB

Post by flink » Wed Aug 01, 2012 11:19 am

paul wrote:
/snipz
I have both resonators and crystals up at moderndevice.com

http://shop.moderndevice.com/products/16-mhz-resonators

/snipz


Paul
Paul, does that pack have both, the SMD and the can capacitors? I'd prefer cans since I'm not really up to doing any smd work.

paul
Site Admin
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Re: using crystal instead of resonator on RBBB

Post by paul » Wed Aug 22, 2012 11:39 am

Sorry - missed the question. The crystal kit comes with both varieties of caps.

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