[Discuss] [possibly OT] Advanced LIRC circuit

[David Bronaugh]

J.Bakshi wrote:
> On Tuesday 16 May 2006 11:10 pm, Rick Morris wrote:
>   
>> What does the circuit diagram look like?
>>
>> If you just need 12 volts, you can get that from one of the hard drive
>> plugs rather than trying to scavenge it from the serial control signals.
>>
>>     
> quite possible. even you can add a 12 volt battery too :-)
> BUT all these can't provide the modularity of a LIRC circuit which steals 
> required voltage from com port. I have built LIRC receiver inside a DB9 box, 
> so I am looking for an advanced circuit which can replace the old circuit 
> inside the DB9.
>   
Why not look at a USB->serial adapter? There's single chip solutions for 
it; you could probably quite easily build your own USB->IR device.

Furthermore, the single-chip stuff can be easily configured (documented 
in data sheet iirc) to use TTL voltages, which if I'm reading you right 
is what the IR transceiver expects. And it'll work on any future device 
you own.

Plus you can reliably tap USB for up to 500mA of power @ 5V if I'm 
recalling the specification right.

David