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'1.790 mhz crystal'
1998\08\12@172658 by Donald Brown

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I'm looking for a 1.790 mhz crystal for the PIC-N-LCD.

This is the crystal required for 1200 bps operation.

I have looked in JDR, Jameco, Digi-Key, and BG Micro.

Can anyone help me locate this crystal ?

Thanks
Don
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1998\08\12@174202 by WF AUTOMACAO

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Donald Brown wrote:
>
> I'm looking for a 1.790 mhz crystal for the PIC-N-LCD.
>
> This is the crystal required for 1200 bps operation.
>
> I have looked in JDR, Jameco, Digi-Key, and BG Micro.
>
> Can anyone help me locate this crystal ?
>
> Thanks
> Don
> _________________________________________________________
> DO YOU YAHOO!?
> Get your free @yahoo.com address at http://mail.yahoo.com

I see that is not a Standard Crystal.

I looked for at Jameco, Farnell, All Electronics, Mouser and nothing!

Miguel.

1998\08\12@175233 by WF AUTOMACAO

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Donald Brown wrote:
>
> I'm looking for a 1.790 mhz crystal for the PIC-N-LCD.
>
> This is the crystal required for 1200 bps operation.
>
> I have looked in JDR, Jameco, Digi-Key, and BG Micro.
>
> Can anyone help me locate this crystal ?
>
> Thanks
> Don
> _________________________________________________________
> DO YOU YAHOO!?
> Get your free @yahoo.com address at http://mail.yahoo.com

I looked for at Farnell, Jameco, ALL ELECTRONICS and MOUSER, and ;(
nothing!

It's not Standard Crystal!

Miguel.

1998\08\12@180254 by John Hansen

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At 02:17 PM 8/12/98 -0700, you wrote:
>I'm looking for a 1.790 mhz crystal for the PIC-N-LCD.
>
>This is the crystal required for 1200 bps operation.
>
>I have looked in JDR, Jameco, Digi-Key, and BG Micro.
>
>Can anyone help me locate this crystal ?
>
>Thanks
>Don
>_________________________________________________________
>DO YOU YAHOO!?
>Get your free @yahoo.com address at
<http://mail.yahoo.com/>http://mail.yahoo.com
>

1.8432 MHz is readily available.  I would try it.  It's less than 3 % high.
The documentation on the serial routine for my CCS PIC C compiler
says that "if the baud rate can not be achieved within 3% of the
desired value using the current clock rate an error will be generated."

So the engineers at CCS obviously think 3% is close enough for
serial communication.

If the PIC n LCD code is already biased on the high side, using
this crystal may push it too far off, but I think it is worth a try.

John Hansen

1998\08\13@083202 by Leon Heller
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In message <spam_OUT35D242DB.59D8TakeThisOuTspamambiente.com.br>, WF AUTOMACAO
<.....wfKILLspamspam@spam@AMBIENTE.COM.BR> writes
>Donald Brown wrote:
>>
>> I'm looking for a 1.790 mhz crystal for the PIC-N-LCD.
>>
>> This is the crystal required for 1200 bps operation.
>>
>> I have looked in JDR, Jameco, Digi-Key, and BG Micro.
>>
>> Can anyone help me locate this crystal ?
>>
>> Thanks
>> Don
>> _________________________________________________________
>> DO YOU YAHOO!?
>> Get your free @yahoo.com address at http://mail.yahoo.com
>
>I see that is not a Standard Crystal.
>
>I looked for at Jameco, Farnell, All Electronics, Mouser and nothing!

It isn't all that expensive to get crystals custom-made. Here in the UK
I can get crystals made for about £10. The companies that supply the
amateur radio market are probably the cheapest for small quantities.

Leon
--
Leon Heller: leonspamKILLspamlfheller.demon.co.uk http://www.lfheller.demon.co.uk
Amateur Radio Callsign G1HSM    Tel: +44 (0) 118 947 1424
See http://www.lfheller.demon.co.uk/dds.htm for details of a simple AD9850
DDS system. See " "/diy_dsp.htm for a simple DIY DSP ADSP-2104 system.

1998\08\13@114014 by Peter L. Peres

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Other solution: Use a stand-alone oscillator and a flipflop divider to run
the PIC with external clock w. a 3.58 MHz crystal.

Peter

1998\08\13@114024 by Peter L. Peres

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> 1.8432, error < 3%

Hmm. Depends how the bit-banging is done. 3% is per bit, and at the 8 th
bit it corresponds to 8.5 * 3 % = 25.5 % assuming that reads occur in the
middle of each bit period. Over-sampling readers meant for over-the-air
serial data decoding will fail with this kind of error.

Peter

1998\08\13@121820 by Peter L. Peres

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On Wed, 12 Aug 1998, Donald Brown wrote:

> I'm looking for a 1.790 mhz crystal for the PIC-N-LCD.
>
> This is the crystal required for 1200 bps operation.
>
> I have looked in JDR, Jameco, Digi-Key, and BG Micro.
>
> Can anyone help me locate this crystal ?

You may have to look for one for a few months... 1.790 = 3.57 MHz / 2.
imho, use 2400 Bauds and a NTSC color crystal.

Peter

1998\08\13@180831 by Claudio Rachiele IW0DZG

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                  Status Distribution August 12, 1998 21:47:46

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