As Mike suggests, you could do this without adding any extra hardware. If
you could use the 16F628 instead, set the hardware PWM to 36 KHz; drive the
IR LED between your data pin (cathode), and the PWM out (anode). This would
take up 2 pins on your PIC, but you could do it with just one pin as well if
you control the PWM output itself as per your data.

Regards,

Anand


----- Original Message -----
From: "Debbie Hynes" <debbiehynes2002@YAHOO.COM.AU>
To: <PICLIST@MITVMA.MIT.EDU>
Sent: Tuesday, January 20, 2004 1:09 PM
Subject: [EE:] IR modulator schematic?


> PICers - i'm looking round for ideas to build an IR modulator cct. did a
quick
> google but mostly fopund IR receivers.
>
> I'm using a 16f84 to drive an IR led but i'll need to modulate it at
38kbps. i
> guess i could use a 555 to gate the LED on/off - any other ideas?
>
> thankz 4 advice
>
> best - Debbie :)
>
> http://personals.yahoo.com.au - Yahoo! Personals
> New people, new possibilities. FREE for a limited time.
>
> --
> http://www.piclist.com#nomail Going offline? Don't AutoReply us!
> email listserv@mitvma.mit.edu with SET PICList DIGEST in the body


---
Outgoing mail is certified Virus Free.
Checked by AVG anti-virus system (http://www.grisoft.com).
Version: 6.0.516 / Virus Database: 313 - Release Date: 01-Sep-03

--
http://www.piclist.com#nomail Going offline? Don't AutoReply us!
email listserv@mitvma.mit.edu with SET PICList DIGEST in the body