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Old 7th October 2010, 11:51 AM   #111
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Thanks Patrick,

as I don't know too much about this stuff I have more (stupid) questions.

Could the output impedance reduced further?
It looks like this thing needs a "beefy" power suppy. Does the follower also work with lower voltages, think of batteries, i.e. a scaled down version?
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Old 7th October 2010, 01:28 PM   #112
EUVL is offline EUVL  Europe
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> Could the output impedance reduced further ?

No.

> Does the follower also work with lower voltages, think of batteries.

It will work at 12V. You probably want to drop the diode voltage to 6.2V anyway if you are using 2SK2013. It will still consume approx. 200mA per channel.


Patrick
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Old 9th December 2010, 09:23 PM   #113
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Quote:
Originally Posted by adason View Post
i built this one quite a few years ago, it worked fine, but in comparison to tube headphone amp it was nothing special
http://headwize.com/projects/showfil...szeke1_prj.htm
I built the updated design (using a three terminal adjustable voltage regulator (LM317T) as a constant current source). I used an off board 13.8v regulated PSU, and an Alps Blue 50k dual log/47k metal fim shunt resistor as a passive attenuator for the input source. It sounds surprisingly detailed and uncoloured.
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Old 20th February 2011, 09:45 PM   #114
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Hola a todos!. Soy nuevo en este foro. Soy de Marcos Juárez, Córdoba, Argentina. Quiero compartir con ustedes un circuito de mi propiedad que diseñé hace un tiempo y que tiene un desempeño ejemplar. Es un buffer basado en mosfet (drain común) trabajando en clase A pura y es single ended. Puede desarrollar una potencia máxima de hasta 1,26 W rms sobre 6 ohmios. Actualmente lo utilizo conectado a la salida de un CD player con voltaje de salida de hasta 2V rms, con lo que logro potencias de hasta 0,66W rms sobre 6 ohmios. Dispongo toda sus especificaciones técnicas para quien desée construirlo.

Saludos y disculpen mi idioma.
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Old 20th February 2011, 10:06 PM   #115
tinitus is offline tinitus  Europe
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diego, english please

I translated your other post, with a note to post in english
maybe you did not read

I know your text is fine
but I cannot continue to translate all your posts

next non english post will be removed


moderation
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Old 4th March 2011, 09:04 AM   #116
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Hello everyone!. I'm new to this forum. I'm Marcos Juárez, Córdoba, Argentina. I would like to share with you a circuit of my property that I designed some time ago and has an exemplary performance. It is a buffer based on mosfet (common drain) working in pure class and is single ended. You can develop a maximum power of up to 1.26 W rms on 6 ohms. Currently I use connected to the output of a CD player with output to 2V rms voltage, which accomplishment powers up 0, 66W rms on 6 ohms. I have all the technical specifications for whom wish build it.


Greetings and sorry for my language.

Click the image to open in full size.
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Old 4th March 2011, 09:06 AM   #117
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Quote:
Originally Posted by tinitus View Post
diego, english please

I translated your other post, with a note to post in english
maybe you did not read

I know your text is fine
but I cannot continue to translate all your posts

next non english post will be removed


moderation
tinitus if you want when diego post in spanish send me a pm or e-mail & I will translate for the forum.

Cheers

Felipe
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Old 16th July 2011, 07:17 AM   #118
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have hd555 and keen to build this but is there an alternative to lu1014?
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Old 18th July 2011, 08:42 AM   #119
EUVL is offline EUVL  Europe
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Not really, but then it is very easy to get, prematched.

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Patrick
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Old 18th July 2011, 08:43 AM   #120
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thanks Patrick, is this still considered the top headphone amp for diy?
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