Post by thread:1.790 mhz crystal

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

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.

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.

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

In message <spam_OUT35D242DB.59D8TakeThisOuTambiente.com.br>, WF AUTOMACAO <.....wfKILLspam@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: leonKILLspamlfheller.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.

> 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

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

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