Any design with large BJT´s are interesting.
I am an old Denon fan and likes the sliding bias but looking for something new.
Using an old PMA-1560 which i like very much.
Pelle
I am an old Denon fan and likes the sliding bias but looking for something new.
Using an old PMA-1560 which i like very much.
Pelle
Interesting design ,i have to go through the schematics and the comments to be able to say anything about it.
My first thought is that i like the simplicity in it but it looks like it has to be very carefully balanced when it comes to selecting parts for it.
Pelle
My first thought is that i like the simplicity in it but it looks like it has to be very carefully balanced when it comes to selecting parts for it.
Pelle
Allison is another sliding bias worth considering:
If you don't mind the low low input impedance.
Directly into a pair of emitters! Input Z actually
not as bad as it might seem, because its also a
follower of the input.
Though I tend to abuse a pair of Alephs as-if
they were an Allison. Same thing only different.
Into the emitter, rather than the normal way...
Voltage followers rather than current sources.
----------------------------------------------
With Allison, any curvature of the output devices
is hidden inside the sliding bias correction loop(s).
Same - Same the forklift of Alephs as I use.
Its not hard to get shut-off-less AB with a cold
pair of Schottky diodes strung between error
corrected sliding bias followers of any topology.
Far easier than to match cutoff curves of hot
"complimentary" N and P transistors.
------------------------------------------
All these amps could be considered variants
of the diamond buffer.
If you don't mind the low low input impedance.
Directly into a pair of emitters! Input Z actually
not as bad as it might seem, because its also a
follower of the input.
Though I tend to abuse a pair of Alephs as-if
they were an Allison. Same thing only different.
Into the emitter, rather than the normal way...
Voltage followers rather than current sources.
----------------------------------------------
With Allison, any curvature of the output devices
is hidden inside the sliding bias correction loop(s).
Same - Same the forklift of Alephs as I use.
Its not hard to get shut-off-less AB with a cold
pair of Schottky diodes strung between error
corrected sliding bias followers of any topology.
Far easier than to match cutoff curves of hot
"complimentary" N and P transistors.
------------------------------------------
All these amps could be considered variants
of the diamond buffer.
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check out this thread:
http://www.diyaudio.com/forums/soli...ss-pma1560-how-works-circuit.html#post2326255
http://www.diyaudio.com/forums/soli...ss-pma1560-how-works-circuit.html#post2326255
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hi,
You must defenitely check out Edmond Stuart's great website on this subject: data-odyssey.nl
regards,
Piersma
hi,
You must defenitely check out Edmond Stuart's great website on this subject: data-odyssey.nl
regards,
Piersma
Does the attachement about the mentioned URL not go open?
At my opinion this is - in opposite to the output voltage dependend sliding bias about
http://www.freepatentsonline.com/3995228.pdf
an input voltage dependend sliding bias about opto coupler. I don't understand the theory of operation exactly, but it is clearly not an auto bias design respective a self biased design, because there are two bias potentiometers for adjusting;
1) one for the basic value (arround 20mA/each power bjt) and
2) one for the sliding bias threshold
about
http://www.diyaudio.com/forums/pass...as-automatic-self-biased-overview-wanted.html
you will find an overview about more variations
Thank you for this advice about auto bias design's
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