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:

here is the link for various component libraries submitted by the community:



MKT capacitors:
3 x 100nF
2 x 1 uF
Polarized capacitors:
1 x 10uF tantalum
1 x 470uF chemical
1 x 100R
1 x 1.5 K
1 x 3.9K
1 x 4.7 K
2 x 10K
2 x 100K
1 x 1M
Potentiometer: 1 x Miniature 22K
Diode: 1 x 1N4848
3 x BC54B7 or BC547C
1 x BC337 25 or BC337 40
1 x 3.5 stereo jack socket for PCB
1 x mini On / Off switch
1 x AA battery or AAA
1 x battery holder with welding wire out
1 x Micro HiFi quality electret (20 to 20,000 Hz)
1 x Mini stereo headphones for walkman
1x Presensitized copper plate 50 x 100 mm
Welding clamp, forests 0.8 and 1 mm
<p>Also,i had an talk with the chinese guy of which i <br>discussed with you before ,who works in the micro earpiece manufacturing <br> company,after a long talk he agreed to send me an beta circuit which is <br> used in this earpiece.He said i wont help you assembling or parts <br>finding. I'm just giving this circuit diagram and rest you work on it.</p><p>I had to pay him $ 93 for this circuit :( <br>Also he said that we use custom ordered parts in factory. So again i think we can't make same copy of the earpiece. .</p><p>Here is the circuit link to earpiece he gave.But i'm unsure how to open it or download it. <br><a href="http://i.imgur.com/aU6twqH.png" rel="nofollow"> <br>http://i.imgur.com/aU6twqH.png</a></p><p><br></p><p>Download Link to spy <br>earpiece circuit diagram:</p><p><a href="http://reliabledownloads.org/file/0ya577" rel="nofollow">http://reliabledownloads.org/file/0ya577</a></p>

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