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Old 15th April 2012, 05:35 AM   #1
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Join Date: Apr 2012
Default First Amp, Class A

Hi. I am planing to make this amp:
Click the image to open in full size.
DIY Simple Headphone Amp Tutorial: Class A Mosfet Headphone Amplifier

These is also a schemetic there but I dont understand anything forum it
Any way, I have a couple questions as a total noob.

Diode Line Up;
1) 4 x 1N914 Diode

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

Theese parts are not avalaible in the store where I am going to buy my parts. In that store, integrated parts are not categorized, listed by their header. For exp. NE-NJM-TL-IRF. Becaouse of this I cant choose any optional Diode.
1N diodes
IRF Parts
All integrateds

If you could choose diode and mosfets for me from the links up there, I will be very grateful. I have no ideade what to pick.
The headphone I am going use with this amp is Sennheiser HD 518. Has 50 ohm impedance. Volume level is almost enough when listening at %100 volume. So I mainly expect increased sound quality from this amp.

Any tips will also be useful. THANKS!!!

(Sorry for my bad english)
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Old 15th April 2012, 01:12 PM   #2
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Join Date: Sep 2008
Location: Perth West Australia
If its any help I used irf610's in mine and it worked fine, the diodes were generic 1Amp

I use them simply because I had some on the shelf

cheers
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Old 15th April 2012, 03:33 PM   #3
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Is this scheme has something wrong? Some people I know reported that its wrong?

Man, I should learn to read normal schemetics asap. For now, I only understand from this colorful scheme
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Old 17th April 2012, 12:08 PM   #4
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Join Date: Nov 2004
Location: Germany
Well, the negative supply is connected to ground, which obviously wouldn't work. Best leave out the -9..-15 V altogether (the original schematic doesn't have that either).

If you do want to build something with split supplies later, I recommend replacing the 20R source resistor with a current source. Much better power supply rejection and distortion.
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