From: Moritz von Buttlar (info_at_baltic-microsolutions.de)
Date: 2001-12-18 03:02:17
Hi Doug !
> >> 5) There are bunch of different 7.3728 Mhz crystals,
> >> packaging is either cylinder, HC49 ...
> > IIRR I have used a HC49 Type with flat hight.
>
>Hmmm ... digikey has three HC49 packages listed:
>HC49, HC49/UA, and HC49/US. Any clues here? Does
>it matter if they are 18pF or 20pF?
I think it's not so important. I would by the HC49 and try it.
Never had any problems with quarzes so far.
>> 6) Is an LM340T-5.0 1A 5V TO-220-3 Regulator okay?
> > TO-220-3 pins have twice the spacing of the 7805
> > regulator. It will not fit.
>
>Hmmm ... that one showed up as a 7805 regulator in
>the digikey parts search. The following also showed:
>
>Texas Instruments UA7805CKTER (3-PFM package)
>Texas Instruments UA7805CKC (TO-220AB package)
>NJR NJM7805FA (TO-220F package)
>
>Are any of these okay? What is the right package?
I think TO-220 is right.
regulated 5VDC. So can I feed the regulated 5V
>from the PT6302A into the TMA0505S? Is the TMA
>converter there just for isolation purposes?
Yes. That's why the TMA is very important.
(12VDC). Are there any safety issues with using
>the AC/DC adapter or vehicle power (assuming I
>have the 6139Ns and TMA0505S installed)? Is it
>safe, or can I only use it on battery power?
It should be safe as long as you have all the isolation parts.
Moritz
---------------------------------------------------
Moritz von Buttlar
Flash uC/DSP Development http://www.baltic-microsolutions.de
Free EEG Design http://openeeg.sf.net
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