Re: Q: 5V<->12V level conversion

Frank,

Good point! I think the link was too long. Try browsing to the only
file in this folder ->
http://groups.yahoo.com/group/opendiag/files/AJB/

Thanks for trying!
Adam

--- In opendiag@yahoogroups.com, "Frank" <frank@b...> wrote:
> The link doesn't seems to work, so it's difficult to review
something that
> isn't viewable
>
>
> -------Original Message-------
>
> From: opendiag@yahoogroups.com
> Date: dinsdag 14 oktober 2003 5:54:55
> To: opendiag@yahoogroups.com
> Subject: [opendiag] Q: 5V<->12V level conversion
>
> I'm after some validation of this cicuit -
>
> http://f3.grp.yahoofs.com/v1/sGaLP_qiX3XBN-0F61-
> _E5a_BTiLgo0FvJy7wqIIa50c0x15sxgZ0tgWwMMNXAjYGd2V_2zKvf69vodJ6xH68z-
> E9V-xV7vHQ2giBQ/AJB/cnv.jpg
>
> I'm after a way of sending/receiving from my car ECU a 12V digital
> signal using a uController (AVR).
>
> A kind sole presented the above circuit. Based on the labelling, to
> transmit from the car (12V) to uController(5V), place 12V (or 0V)
> on the collector of Q1 (labelled K line) and read on Tx.
>
> To transmit from the uController, place 5V (or 0V) on Rx and read
> from the K line.
>
> I've also discovered placing 5V (or 0V) on the emitter of Q1
> (labelled Tx) works! This freaks me out! Why does this work ?
>
> Anyone got any general suggesions as to whether this is a good
> approach. Also, if I want to include optoisolate this circuit (in
> both directions) how would I go about doing this given a single
line
> carries Tx and Rx information?
>
> Thanks in advance!
>
>
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Received on Tue Oct 14 03:00:52 2003