On Fri, 22 Jan 2010, carreras_marcos wrote:
> Good morning folks!, I need to drive two relays connected to both DIOs at
> my TS-7200. Due to the sink at these lines are 4mA ( 3,3V ), will need to
> drive them by using optocouplers. Any idea of which PN I Could use?, FYI,
> the Ic at the output stage, would have to drive a 260R coil ( around 40mA
> )
Why do you need an opto coupler? A transistor buffer would probably be all
you need.
> The second part of the question ( or the other question ) is:
>
> Need to connect a 16x2 display at the Display port. I TS port has direct
> connection to the display ( based on a HD44780 ). My question is related
> to the contrast adjustment pin, which in the TS is biased to ground thru
> a 620R resistor. How should I connect this pin to the display one?
What does the data sheet for the display say? Often the contrast pin is
recommended to be connected via a variable resistor to ground so that some
one can control the contrast level. TS provide a fixed resistor to ground
that presumably works fine for the display they sell. As I said, consult
your display datasheet.
>
> Thank you very much for your help...
>
> Marcos
>
>
>
>
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