Re: lirc receiver incompatible with EPIA Eden onboard serial? voltage?

[Apolon <apo...@if...>]

Yes, you can take the +5v directly on the motherboard, and of course, yon won'y need anymore the diode and the regulator.

you can wire directly the +5v on the receiver.


Le 15 Jan 2003 21:48:47 -0800 Adam Megacz <ad...@me...> a écrit:

> 
> Adam Megacz <ad...@me...> writes:
> > Is it possible that the Eden, which is designed to be a low-power
> > board, doesn't deliver enough voltage to the serial port to drive my
> > IR receiver?  If so, is there any way I can compensate for this?
> 
> I found this in the lirc hardware descriptions:
> 
>     As the input voltage for the 78Lxx type regulators has to be at
>     least 2V higher than the output voltage to work reliably, this
>     circuit probably won't work on some notebooks.  The line drivers
>     inside notebooks often provide voltages about 6V or even less. So
>     you should make sure that your serial port delivers at least 8V of
>     output voltage.
> 
> Now, I have access to +3.3v, +5v, -5v, +12v, -12v, and ground from the
> ATX power connector... could I wire the RTS input on the receiver to
> the +12v source on the motherboard?  Do you think this would help?
> 
> Also, strangely, the packard bell IR reciever has a wires going from
> both RX and TX to the board containing the circuitry...  if I
> understand correctly, it should only need RTS (power, pin 8), RX (pin
> 3), and Ground (pin 5).  I'll try running with TX disconnected later
> tonight and see if things still work.
> 
> Actually, as long as I'm wiring stuff directly to the motherboard, I
> guess I could get away with building my own receiver out of only two
> parts... if I use +5 straight from the motherboard, I don't need the
> diode or the voltage regulator.  That would mean all I would need
> would be a resistor, a capacitor, and the IR element...
> 
> Thanks again for any help...
> 
>   - a
> 
> 
> 
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