If yo u want the Aleph sound, why not just make Aleph JX? I truly dont know how to imporve the efficiency of a buffer, but that dosn't mean it cant be done.
But can anyone help me out on the original questions why adding an aleph current source to just the buffer stage doesn´t work and results in an occilation.
You would need to post a schematic of your modifications before anyone can comment.
You will get a lot more efficiency out of BA#2, which is push-pull instead of single-ended/constant current source.
If you want more efficiency out of the all-N channel output stages, we will expect to be doubling the efficiency in a later version.
As I said earlier, change the topology to a quasi push pull output.
Thanks for your suggestion but I do not necessarily want the aleph sound. alltough a newby a big part of all this hassle is because I want to learn and be able to know whats going on in these circuits.
But again not to just build someones (Nelsons) design and then settle with it but to learn, and have fun in the proces of learning.
Buzzforb, Thanks for your input so far and hope that when you suddenly get struck by and idea of how to increase efficiency you will let me know.
I hope someone else out there will be able to answer my questions.🙂
But again not to just build someones (Nelsons) design and then settle with it but to learn, and have fun in the proces of learning.
Buzzforb, Thanks for your input so far and hope that when you suddenly get struck by and idea of how to increase efficiency you will let me know.
I hope someone else out there will be able to answer my questions.🙂
the post you quote by Nelson Pass looks old enough that the mentioned 'later version' could be the relatively new BA-3, which basicly is a new frontend combined with output from either BA-1 or BA-2
and now a bit later cascoded input and additional driver for the turbo charged F5 ... and maybe all variations of going balanced as well
is that the effieciency you ask about ?
and now a bit later cascoded input and additional driver for the turbo charged F5 ... and maybe all variations of going balanced as well
is that the effieciency you ask about ?
Itsmee, you responded whilst I was typing.
For the moment I hope someone will put me on a track where I can explore further into increasing the efficiency of BA1.
The schematic of how I tried to add an aleph current source wil follow Later
For the moment I hope someone will put me on a track where I can explore further into increasing the efficiency of BA1.
The schematic of how I tried to add an aleph current source wil follow Later
Tinitus
Ba3 does in no way incease the efficiency of the all N channel output.
(also bridging or turning it into a balanced version is for as far as I know something different than increasing efficiency)
Ba3 does in no way incease the efficiency of the all N channel output.
(also bridging or turning it into a balanced version is for as far as I know something different than increasing efficiency)
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Papa's quote is fairly old - 21st April 2009, 09:29 PM, but he does not always release circuits in a linear fashion (sorry, no pun intended).
The only way to increase the efficiency of the BA1 (as far as I know) to the same as the BA2 is to configure it as a quasi output.
Link to AmpsLab c200.1 Quasi-Complementary 200Watts Power Amp Schematics
The only way to increase the efficiency of the BA1 (as far as I know) to the same as the BA2 is to configure it as a quasi output.
Link to AmpsLab c200.1 Quasi-Complementary 200Watts Power Amp Schematics
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So modulate the lower Fet, which is the CS in this case. If he was trying to modulate the top Fet, I can see having problems.
By having less of its consumed energy being turned into heat..
The only thing I can thinhk of is adding an aleph current source but that didn´t work so far. Maybe some clever trick to have this thing move into class a pp or ab
I realy can´t think of another way but that doesn´t mean much, and certainly not that it will therefor be impossible. ........
The only thing I can thinhk of is adding an aleph current source but that didn´t work so far. Maybe some clever trick to have this thing move into class a pp or ab
I realy can´t think of another way but that doesn´t mean much, and certainly not that it will therefor be impossible. ........
For the moment I hope someone will put me on a track where I can explore further into increasing the efficiency of BA1.
The schematic of how I tried to add an aleph current source wil follow Later
instead of messing up this thread, maybe you better open a thread with your project
and no, I do not have a mod hat on
its not for me to decide what you want
ofcourse its perfectly fine here if other people are interested in your ideas
but if not....you have just presented it, at thats it, and ok too
work on it, come back again and show us what you have
but don't push people if they don't want it
would be perfect to open a thread and show what you are doing, photos, schematics, debate, anything
Here is the schematic of how I tried to implement an Aleph cs.
(and which oscilated)
Any help or explanation on why this doesn´t work or how it shut be done is most welcom
(and which oscilated)
Any help or explanation on why this doesn´t work or how it shut be done is most welcom
Attachments
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Now I have seen your schematic, I'm not surprised it oscillated, it has positive feedback.
Take a look at the Aleph J, look at the phase of the signal at various points in the loop compared to your cct, start at the output, then at the collector of the bias transistor - ok so far, then back at the output of the FET - oops.
http://www.diyaudio.com/forums/pass-labs/111197-aleph-j-schematic.html
Try moving the connection from the base to the collector.
Also watch the polarity of the cap, it looks like it needs to be reversed.
Take a look at the Aleph J, look at the phase of the signal at various points in the loop compared to your cct, start at the output, then at the collector of the bias transistor - ok so far, then back at the output of the FET - oops.
http://www.diyaudio.com/forums/pass-labs/111197-aleph-j-schematic.html
Try moving the connection from the base to the collector.
Also watch the polarity of the cap, it looks like it needs to be reversed.
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now i'm gonna attempt this first amp i ever have
and i know this sounds ignorant
but does anyone have a parts list for the power supply?
and does anyone recommend any place to order them?
if you where to double the outputs it would double ohms to 16 ohms right?
and i know this sounds ignorant
but does anyone have a parts list for the power supply?
and does anyone recommend any place to order them?
if you where to double the outputs it would double ohms to 16 ohms right?
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Hi Namesmeanlittle,
If you will go to firstwatt.com The Power supply schematic is there(also in the store ),so few parts,just make a list.
Mouser and digi-key have parts,Lots of places to get transformers,torrids are prefered.
The output will depend on how you wire them to the speaker or speakers,These amp's push 4 to 8 ohm EZ,
Have fun and do ask in these forms if you get stuck,Take your time!
Regards,
NS
If you will go to firstwatt.com The Power supply schematic is there(also in the store ),so few parts,just make a list.
Mouser and digi-key have parts,Lots of places to get transformers,torrids are prefered.
The output will depend on how you wire them to the speaker or speakers,These amp's push 4 to 8 ohm EZ,
Have fun and do ask in these forms if you get stuck,Take your time!
Regards,
NS
Call Steve at ApexJr and tell him what you're building, and he can supply transformers, rectifiers, caps, inductors, resistors, wire, connectors, terminal strips, etc...
thanks
i'm probably gonna make 2 completely separate mono blocks ( i wanted to double outputs thats why i was ohms worried) that match next to each
other with heat sinks on only one side
i wish i had a pic
show you in a couple months when i'm done
add led's and a beaker fans lots of fans so i can run it full
then i'll hook them up to my Sasuie sp 1500's and run it half output like the rest of my system haha.... inside joke
i'm probably gonna make 2 completely separate mono blocks ( i wanted to double outputs thats why i was ohms worried) that match next to each
other with heat sinks on only one side
i wish i had a pic
show you in a couple months when i'm done
add led's and a beaker fans lots of fans so i can run it full
then i'll hook them up to my Sasuie sp 1500's and run it half output like the rest of my system haha.... inside joke
hes based out of caly though i don't see a credit card
o and just wandering how much would one of these sell for? i tried looking
o and just wandering how much would one of these sell for? i tried looking
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