Hi from France
Here is a small amp with 4 transistors which improves listening for person are obliged to turn up
the volume of the TV and that hinder their families they hear very well.
Is a Canadian "Cousin" named Gary Pechon who is behind this arrangement.
Assembly is supplied with a 1.5 volt AA battery and the sound quality is good and is very low cost.
I built everything with KiCad ( the zip is attached with all the project files at the end of this instructable)
I 've build it with the free Kicad electronic software but you can easily convert to Eagle
here is link to dowload Kicad: http://www.kicad-pcb.org/display/KICAD/KiCad+EDA+S...
here is the link for various component libraries submitted by the community: http://www.kicadlib.org/