First Amp, Class A

exhornet · 15th April 2012, 05:35 AM

Hi. I am planing to make this amp:

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)

FREDtheDOG · 15th April 2012, 01:12 PM

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

exhornet · 15th April 2012, 03:33 PM

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

sgrossklass · 17th April 2012, 12:08 PM

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.

15th April 2012, 05:35 AM	#1
exhornet diyAudio Member Join Date: Apr 2012	First Amp, Class A Hi. I am planing to make this amp: 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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15th April 2012, 01:12 PM	#2
FREDtheDOG diyAudio Member 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

15th April 2012, 03:33 PM	#3
exhornet diyAudio Member Join Date: Apr 2012	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

17th April 2012, 12:08 PM	#4
sgrossklass diyAudio Member 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.