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Old 13th July 2002, 09:15 AM   #1
Jean is offline Jean  United States
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Default single mosfet headphone amplifier question

I am curious about this particular single mosfet headphone amplifier circuit. I wonder if anybody here build it and care to tell how good it sounds ?

http://www.headwize.com/projects/sho...szeke1_prj.htm
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Old 13th July 2002, 09:36 AM   #2
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Default Of course! Many have built it!

This is one of the most wellknowned Designs
in the "headphone world".

1000s of version have been built.
Modifications of a lot.

This is a simple Current Buffer.
Does not amplify voltage
and so avoids the problems which follows by that.

Have you read the Addendum.
And also go to Headwize Forum "DIY workshop"
and seach of the name of the constructor "Szeke"

http://www.headwize.com/projects/sho...e1_add_prj.htm

If there is no need for advanced, complicated solution,
use the SIMPLE one.

Will give you best result.

gromanswe
always smplifies
his language
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Old 13th July 2002, 02:04 PM   #3
paulb is offline paulb  Canada
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I built it and am very happy with it. A clean voltage source is important, I use a capacitance multiplier circuit.
For an improved version that uses a constant current source, see:
ZEN-like headphones amp
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Old 15th July 2002, 03:14 AM   #4
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Hey,

It is a pretty good amp design. It is very easy and affordable to build and it sound pretty good. I use a very good PSU to go with it. Improving PSU really reflects on the performance of this amp. Pay attention and build good PSU for this amp (or you can buy one.).

It has a potential to sound extremely good so it isn't an entry level or newbie amp. You can upgrade to sound even better.

Tomo

P.S. I recommend CCS to go with it. It makes Mosfet sound more linear.

<img src="http://www.headwize.com/images4/tomo_cs1.gif" img>

Note how I built my CCS. I simply used LM317. (Cheap! and Easy!) But it works wonderfully and it comes with temperature compensation so it is safe too.
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Old 17th July 2002, 09:31 PM   #5
Thomas is offline Thomas  Denmark
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Hey!

I also buildt this amp (one week ago). It sounds just amazing! I chose the DC-coupled, still very simple, version to get rid of the large output capacitor. The only real difference otherwise is that you need +/- supply.

I run the amp on 10.5V rails and increased R4 to 33ohm. - Cant wait to upgrade with constant current device and better capacitors.
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Old 19th July 2002, 08:31 PM   #6
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You know when an idea comes along, and you also get an easy answer on how to do impliment it, well thats how the circuit came up.

I never really wanted to experiment with different designs. I figured the beauty of the simple circuit was too pretty to clutter up.

I had intentions of making a high powered version for speakers, but thats still not done.
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Old 19th July 2002, 08:41 PM   #7
paulb is offline paulb  Canada
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My congratulations on publishing such a simple yet high quality circuit. I think many DIY beginners have built this and then gone onto more challenging things. I believe Nelson Pass is using this type of circuit for his headphones.
My only change to your circuit was to build it using P-channel parts (I had a bunch) and run it from a -ve supply.
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Old 19th July 2002, 08:48 PM   #8
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Default GSzekeres

What are you doing these days.
Still building/designing?
Other matters might have come your way.
Life has many things to offer.

gro
"DayDream Believer" /Monkees in the 60s
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Old 23rd June 2007, 11:50 PM   #9
lineup is offline lineup  Sweden
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Thumbs up Leo Bodnar improved GSzekeres IRF HEXFET MOSFET HPA Buffer

Quote:
Originally posted by gromanswe

This is one of the most wellknowned Designs
in the "headphone world".

1000s of version have been built.
Modifications of a lot.

This is a simple Current Buffer.
Does not amplify voltage
and so avoids the problems which follows by that.

Have you read the Addendum.
And also go to Headwize Forum "DIY workshop"
and seach of the name of the constructor "Szeke"

http://www.headwize.com/projects/sho...e1_add_prj.htm

If there is no need for advanced, complicated solution,
use the SIMPLE one.

Will give you best result.

gromanswe
always smplifies
his language
Quote:
Originally posted by GSzekeres
You know when an idea comes along, and you also get an easy answer on how to do impliment it, well thats how the circuit came up.

I never really wanted to experiment with different designs. I figured the beauty of the simple circuit was too pretty to clutter up.

I had intentions of making a high powered version for speakers, but thats still not done.

An original Greg Szekeres HeadPhone Amplifier Buffer using MUSFET, can look like this
( szekeres own schematic )
Click the image to open in full size.


Leo Bodnar has suggested & built an improved GSzekeres HPA Buffer.
See my attachment.


Regards lineup
Attached Images
File Type: gif improved-geeg-szekeres-hpa_by-leo-bodnar.gif (7.0 KB, 989 views)
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