I'm a photographer and have limited knowledge about electronics. 
recently I saw this circuit:
![enter image description here](https://i.stack.imgur.com/qVdkN.png)
which is explained [here](http://www.kukk.org/blog/arduino/infrared-black-magic/)
I tried to Build it, it works fine on my laptop jack, but does not work on my android smartphone jack. I guess it's because of low output signal voltage (less than 0.6V) as explained in [this case](https://electronics.stackexchange.com/questions/71792/how-can-i-effectively-reduce-the-voltage-needed-to-activate-a-transistor).
since I only have lm386 IC in my stuff an it's important to keep circuit size as small as possible, I am wondering if there is a way to use just one lm386 IC to amplify both channels without any change in output infrared signals? 
please guide me how to design my circuit.(with one or two ICs)
Thanks