I was reading that we put tv remotes on a 40khz signal so we can burst it, emitting more light at a time, thus going farther.
1)Is that 50% duty cycle?
2)could this work with a pocket laser?
3)IR led with a voltage rating of X-volts(DC), how much higher do/can i raise my burst voltage?
4) what is the best IR transmitter circuit i can use, just a basic 555 + transistor + LED....(how do i calc supply voltage)?
5) what is the best IR receiver to use, could I use an op-amp(or band filter) to filter out the ambiant room noise thus increasing my 40khz carrier signal?
You were reading (or understanding) wrongly - the 40KHz modulation is to give immunity from interference, the bursts of 40KHz have a low duty cycle to allow high pulse currents. Try reading my PIC IR tutorial, for a receiver use one of the many IR receiver IC's, they give excellent performance, easily exceeding 10m.
thnx nigel, that does make more sense, however i am not using serial comm, so my data packs are different, even though i can still use the carrier frequency, is there a way to measure the increase in bursts,,,
ie. if i use a 3v IR led(DC)nominally, then switch to a 40Khz w. 10% duty cycle does that mean i can now use 30v ? ........or should i say amps?
thnx nigel, that does make more sense, however i am not using serial comm, so my data packs are different, even though i can still use the carrier frequency, is there a way to measure the increase in bursts,,,
ie. if i use a 3v IR led(DC)nominally, then switch to a 40Khz w. 10% duty cycle does that mean i can now use 30v ? ........or should i say amps?
well 2 things.....
1) I got some Ir led's rated at 100mW, 30mA constant,, 1A@300pps for 10us , so i get that now, so its not a problem,
but I have a IR Laser diode, but it has no datasheet, right now, i am running it directly from a 555 timer servo PWM circuit, can I "burst" with the laser too?
Buy a book. Read it! I am an ESL (you know what that is, don't you?)
And, about your post #7: You are in a box allright, but you ain't no cracker jack!
E