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

--- In opendiag@yahoogroups.com, "Adam Bradley" <adam_j_bradley@y...>
wrote:
> Henrik,
>
> I'm trying to learn a little more about electronics, I'm really quite
> keen on making it a hobby!
>
> My last take on what I'm going to make (and what will hopefully work)
> is at.
>
> http://members.optushome.com.au/adambradley/electronics/LevelConverter
> /V13/
>

Far easier to follow the design now, and I see that you have removed
the inverter function on the Rx. So far so good, but I don't think the
Tx part is correct. You have to use a proper representation of the
K-line. First of all, you must not have any serial resistors between
the collector of Q2 and the K-line, that will give you a voltage
divider and you might not be able to drive a proper low level towards
the ECU, so remove R5. For the simulation you will have to have a
pull-up to 12V on the K-line. Use something in the 1k to 10k range.
What you will find is that you are still inverting the Tx line, and as
I said, I think that's incorrect in your application.

/Henrik

 
Received on Sat Oct 25 07:46:25 2003