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[SOLVED] How to improve the range of my IR transmitter built with HT12A

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rahib

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I have made an IR transmitter with the help of HT12A and there is a decoder HT12D with a TSOP1738.Its range of working is only 1 ft i want to make it working like a TV remote which can work from a distance of 10m and they have decent directional angle also.
I have worked on HT12E/HT12D it was much better and reliable.But I want to give my transmitter a remote feel that's why i shifted to HT12A for IR.But its range is a big problem.Please help

92_1331010661.png
 

klystron

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Increase the TX IR LED current. (reduce R1 to 50 ohm, but first check the max. load current of the LED)
 

captainshahid

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increasing the LED current will increase the rate of intensity but it will affect the LED performance ....
u should use the circuit like this 11.gif

it is the best for your objective for both circuit safety and range.
 

rahib

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will it work for diverse directivity also.Apart from that do any one know how the TV remotes have such a good range
 

tpetar

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What TX IR Led you using ?


Use TSAL6400 5mm this led can go 100mA or 200mA in peak, I get with this led about 7m rc distance.

What power source you using, I mean what battery ?

With 330R resistor of IR LED :
@5V you have 15mA for IR LED
@3V you have 9mA for IR LED

Decrese this resistor to value 100R and try, this will give 50mA @5V or 30R @3V to IR LED if battery allows. :)

Check battery or replace it.

You can use TSAL4400 3mm also.
 

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  • TSAL6400.pdf
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