Instructables

Hearing Aid amplifier four transistors (good quality and low cost)

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/


 
 
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Step 1: COMPONENTS:

Picture of COMPONENTS:
MiniAmpliPour Oreille-1.jpg
ELECTRONIC COMPONENTS:
MKT capacitors:
3 x 100nF
2 x 1 uF
Polarized capacitors:
1 x 10uF tantalum
1 x 470uF chemical
Resistors:
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
Transistors:
3 x BC54B7 or BC547C
1 x BC337 25 or BC337 40
Miscellaneous:
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