Thursday, March 6, 2008

Class A Mosfet Headphone Amplifier



DIY on Class A Mosfet Headphone Amplifier

In the past, I have always wanted to build a Hi-fi amplifier especially the Son Of Zen by pass lab, the problem I didn't start building, it was because the transformer were to0 expensive for my budget and it is difficult for me to purchase the high power resistor and at my local radio shack, and so the idea was drop or maybe wait till I earn enough from adsense. :)

Recently I came across this Mosfet Class A Headphone amp schematic by Greg J. Szekeres, so I have this intention to read the diagram and draft out the layout of all the component first before I start building it. Let start with the component that I required.

List of Component:

Capacitor Line Up;

1) 2 x 1uf, 35V
2) 2 x 0.1uF, 35V
3) 2 x 470uF, 35V Electrolytic

Resistor Line Up;
1) 2 x 4.7k ohm 1/4w
2) 2 x 100k ohm 1/4w
3) 2 x 220k ohm 1/4w
4) 2 x 1k ohm 1/4w
5) 2 x 220 ohm 1/4w
6) 2 x 20 ohm 5w

Diode Line Up;
1) 4 x 1N914 Diode

Mosfet Chip Line Up;
1) 2 x IRF 513 Mosfet

Optional Item;
1) 10K - 100K Dual Pot

Alright so far the component isn't that much and also it look easy to obtained these stuff. (Thinking of getting all the high grade stuff since not many of them).

Ok let's look at Greg J. Szekeres original schematic;

For more reference and detail please visit his article here.

After reading his schematic, am now going to put all the component into the picture which will look like this;


As above picture shown, this is how I am going to lay all the component by Hot Soldering it.
Ok now, there is one optional item wasn't in the picture which is the audio pot, if you want to add your audio pot, simple connect it before the "Right In" and "Left In" together with any point of the "GND" will do the job.

Last but not least, I will need a regulated 9v-15v power supply which will connect to the (+) and (-) as shown on the layout diagram.

For full detail of the sound quality and description of this Mosfet Class A Headphone amp please visit Greg J. Szekeres Article at http://www.headwize.com/projects/szeke1_prj.htm

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