modulating a ramp into a IR transmitter

From: "Bluespace Technologies" <bluespace@xxxxxxxxxx>
Date: Sun, 10 Dec 2006 04:16:10 -0500

Hi All,

This is a circuit design question for IR data emitters.

Currently I am using a 455 Khz signal to drive an IR LED with pulsed data
modulation at 20 KHz. I want to modulate the data using a ramp circuit
instead of a data pulse (i.e. a ramp replaces the pulse). Does anyone know
how I can modulate a ramp into the 455 khz driver signal? I already have a
ramp generator using a timer circuit, but modulating the ramp into the LED
using a single transistor provides too weak a drive signal to run the LED,
hence reducing its range of operation. How can I modulate a ramp into the
drive signal to get more output power, hence more range?

Thanks for your help!

-Andrew

.

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Re: modulating a ramp into a IR transmitter
... This is a circuit design question for IR data emitters. ... Currently I am using a 455 Khz signal to drive an IR LED with pulsed data ... I want to modulate the data using a ramp circuit ... instead of a data pulse (i.e. a ramp replaces the pulse). ...
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Re: modulating a ramp into a IR transmitter
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Re: modulating a ramp into a IR transmitter
... This is a circuit design question for IR data emitters. ... Currently I am using a 455 Khz signal to drive an IR LED with pulsed data ... I want to modulate the data using a ramp circuit ... instead of a data pulse (i.e. a ramp replaces the pulse). ...
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Re: modulating a ramp into a IR transmitter
... This is a circuit design question for IR data emitters. ... Currently I am using a 455 Khz signal to drive an IR LED with pulsed data ... I want to modulate the data using a ramp circuit ... instead of a data pulse (i.e. a ramp replaces the pulse). ...
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