Audio Splitter

Its yet another tech weekend for me and Kaushani. This time we have come up with a hobby circuit called the "Audio splitter" specially meant for laptops as we've taken the power supply from USB. Its implemented using TDA2822M Dual OPAMP IC with internal feedback which gives a gain of 89 (39db).




It has separate volume knobs for each headphone(o/p) as you can see in the photo below,works on a 10mA current.Its based on a prototype designed by Vasuki Prasad,an ex MIT,Manipal student.


Main features:
1. Power supply from USB (5 Volts)
2. 39db gain and low noise (A bit of hiss sound when fully amplified)
3.Separate volume knobs to control volume of your choice on each o/p.
4.Low cost (complete prototype @Rs 190)