Please report back here your impression once you have built and listened.
As mentioned before, best load impedance is around 67R (e.g. AK701), though the few people who built it seem to be happy with anything from 25R to 200R+.
Patrick
As mentioned before, best load impedance is around 67R (e.g. AK701), though the few people who built it seem to be happy with anything from 25R to 200R+.
Patrick
A friend (who lurks here, but is not a member) has built the non-Taylored version of DAO and says that it performs very good, and better than every commercial headphone amp he has tried.
All credit to Patrick / EUVL.
All credit to Patrick / EUVL.
4 ohm for the standard version, half of that for the TCS (Taylor current source) version.
And very linear.
The TCS version is at the Pass forum under the thread "some other follower configurations".
Patrick
And very linear.
The TCS version is at the Pass forum under the thread "some other follower configurations".
Patrick
Gordy,
Tell him to do another one with the Taylored input and create a bit more room inside and replace those 220uF electros with about 10 - 80uF of film cap (those Russian K73-16 63v ones are just fine here, just a bit big! - remarkable improvement in everything! [Maybe even try those Tant caps...]
.... and while he's in the mood, see about beefing up the power supplies - C multipliers are fine, but again replace/bipass the electros with film caps - Siemens also have some more reasonably sized ones known as B32524 (and are 334-883 in the R/S catalogue) - some of the PP film are a bit dull here (ie. passive Xover caps)
The cost of some of these is a bit of a surprise (hence the K73s) but maybe loan some caps to try.
Using Salas's basic Shunt Regs for this amp is another step up again and it'll be interesting to add the Cavalli valve buffer to the input, when it's finally finished (I like high quality valve "colour" in the sound!) - getting into never-never land now (bigger effort for smaller improvements), but this seems to be one of those simple ccts that are just right for what is required.
Tell him to do another one with the Taylored input and create a bit more room inside and replace those 220uF electros with about 10 - 80uF of film cap (those Russian K73-16 63v ones are just fine here, just a bit big! - remarkable improvement in everything! [Maybe even try those Tant caps...]
.... and while he's in the mood, see about beefing up the power supplies - C multipliers are fine, but again replace/bipass the electros with film caps - Siemens also have some more reasonably sized ones known as B32524 (and are 334-883 in the R/S catalogue) - some of the PP film are a bit dull here (ie. passive Xover caps)
The cost of some of these is a bit of a surprise (hence the K73s) but maybe loan some caps to try.
Using Salas's basic Shunt Regs for this amp is another step up again and it'll be interesting to add the Cavalli valve buffer to the input, when it's finally finished (I like high quality valve "colour" in the sound!) - getting into never-never land now (bigger effort for smaller improvements), but this seems to be one of those simple ccts that are just right for what is required.
There is a much easier solution -- Blackgate standard 10uF or 22uF, >16V.
Alternatively, ultra low ESR conductive polymer caps.
Patrick
Alternatively, ultra low ESR conductive polymer caps.
Patrick
Yeah Patrick,
The smaller size caps are so much easier to manage - I actually prefer the sound of the Nichicon 100uF KZ to the Black Gates here (only tried the 100uf, 220uF F, K and 680uF NX ones)
I'm still avoiding the Oscons and Tantalums caps - a habit now.
What do these new miniature size surface mount caps sound like?
The smaller size caps are so much easier to manage - I actually prefer the sound of the Nichicon 100uF KZ to the Black Gates here (only tried the 100uf, 220uF F, K and 680uF NX ones)
I'm still avoiding the Oscons and Tantalums caps - a habit now.
What do these new miniature size surface mount caps sound like?
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?
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?
> 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
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
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.
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.
Saludos y disculpen mi idioma.
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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
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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
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.
Greetings and sorry for my language.
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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