Do you think you could do the same for me but cropped?
I could very well have it printed in large format and framed.
I could very well have it printed in large format and framed.
The test setup is backlit by the evening sun and photographed with my SmartPhone in 4 to 3 format. I can send you the original file or upload it here.
Three electrolytic capacitors are still missing, I'll fit them today or tomorrow, just before I take the time to carry out the final (dynamic) test. I may also have time for a quick determination of the THD.
Reminder
All signs point to “go”, but the small 25W-A type still has to prove that it does what it is supposed to do ...! It can already heat very well.
And quite contrary to the prophecy of doom (after an automatic offset control, because of the insane drift), the amp. does not drift. After it has brought the hellfire to the surface, the DC offset fluctuates exactly between +32mV and +28mV.
wahab's fears are non-existent in practical use.
kindly,
HBt.
Psst
Later, exactly the same steps will follow with the Beelzebabe 🙂
1. dynamic test
So as not to keep anyone in suspense any longer, in so-called idle mode, i.e. without load ...
I test the basic function - and of course “the Beelzebub principle” works perfectly, exactly as predicted theoretically and simulatively from the outset.
The three common /basic time functions are visually flawless, the maximum control capability, swing, span, is determined by the SoftClipper on the input side in my case. The onset limiting is absolutely symmetrical - the set thresholds (10k trimmer) minimize and define exactly +/-20V_peak.
Beelzebub's shield works perfectly. fh is determined (practically) solely by the TP1 on the input side. DC drift does not really exist - automatic offset control is (would be) an unnecessary luxury.
#
After lunch I'll test under load conditions, until then Bub can bring the room up to operating temperature. If it also passes this 2nd test (and I assume it will, this little devil 😉), I'll release the fire.
HBt.
So as not to keep anyone in suspense any longer, in so-called idle mode, i.e. without load ...
I test the basic function - and of course “the Beelzebub principle” works perfectly, exactly as predicted theoretically and simulatively from the outset.
The three common /basic time functions are visually flawless, the maximum control capability, swing, span, is determined by the SoftClipper on the input side in my case. The onset limiting is absolutely symmetrical - the set thresholds (10k trimmer) minimize and define exactly +/-20V_peak.
Beelzebub's shield works perfectly. fh is determined (practically) solely by the TP1 on the input side. DC drift does not really exist - automatic offset control is (would be) an unnecessary luxury.
#
After lunch I'll test under load conditions, until then Bub can bring the room up to operating temperature. If it also passes this 2nd test (and I assume it will, this little devil 😉), I'll release the fire.
HBt.
2. dynamic test
under real load! Passed 👍
Outlook:
Next, Babe has to show if she's not even better than her twin - they're definitely both dirty, with an inner, satisfied smile.
Both will only reveal themselves in a duet under complex load conditions, in the steady state Bub already clearly shows its origin - I won't reveal any more for the time being.
I release the fire for your own experiments or replication.
Greetings,
HBt.
Psst.
This was the beginning of the project;
on the way to "the ANK" there are (also) some optimizations for version 1. Please take a detailed look at how AKSA (Hugh) uses some compensation tricks.
under real load! Passed 👍
Outlook:
Next, Babe has to show if she's not even better than her twin - they're definitely both dirty, with an inner, satisfied smile.
Both will only reveal themselves in a duet under complex load conditions, in the steady state Bub already clearly shows its origin - I won't reveal any more for the time being.
I release the fire for your own experiments or replication.
Greetings,
HBt.
Psst.
This was the beginning of the project;
on the way to "the ANK" there are (also) some optimizations for version 1. Please take a detailed look at how AKSA (Hugh) uses some compensation tricks.
Now
In the meantime, has a brave knight already dared to create his own version of the little devils? Or would we rather take fully functional NAD amplifiers apart and destroy them in the process (like some experts do)?
Comrades-in-arms wanted.
HBt.
- Bub had to give up his wings for his sister Babe
- all three tests are repeated with the Beelzebabe configuration
In the meantime, has a brave knight already dared to create his own version of the little devils? Or would we rather take fully functional NAD amplifiers apart and destroy them in the process (like some experts do)?
Comrades-in-arms wanted.
HBt.
Attachments
Beelzebabe
passes both dynamic tests at the first attempt and also passes the load test with 5Wrms over a bandwidth greater than 133kHz.
👍
Unfortunately, my two DIY lab power supplies are a bit too weak to deliver the necessary peak load current under full loadconditions - 50Wpeak into 8 Ohm.
#
I recommend the female gender as a casting preference - this is something different from the usual variant -> but both are absolutely twins, so whoever prefers Adam should do so. At the moment I favor Eve.
The Bub has, just like in life, a small behavioral anomaly (which I still have to get to the bottom of, one have to be honest - but it will be due to my poorly etched circuit board or one of the components / the observed phenomenon is strange ... perhaps more on this later, nobody would notice it in normal operation).
Babe behaves in an exemplary manner.
🙂
So I release the circuit,"go"!
greetings,
HBt.
Psst.
This is true Class A ...
passes both dynamic tests at the first attempt and also passes the load test with 5Wrms over a bandwidth greater than 133kHz.
👍
Unfortunately, my two DIY lab power supplies are a bit too weak to deliver the necessary peak load current under full loadconditions - 50Wpeak into 8 Ohm.
#
I recommend the female gender as a casting preference - this is something different from the usual variant -> but both are absolutely twins, so whoever prefers Adam should do so. At the moment I favor Eve.
The Bub has, just like in life, a small behavioral anomaly (which I still have to get to the bottom of, one have to be honest - but it will be due to my poorly etched circuit board or one of the components / the observed phenomenon is strange ... perhaps more on this later, nobody would notice it in normal operation).
Babe behaves in an exemplary manner.
🙂
So I release the circuit,"go"!
greetings,
HBt.
Psst.
This is true Class A ...
Dear @wahab,
do we want to work together to optimize the existing dimensioning, compensation and protective measures?
I would be delighted if we did, so that the B-Babe could become a joint forum project. I have laid the start, or rather the foundation stone.
Now that Babe is working without visible blemishes, the next phase of this fun project is on the agenda - optimize, improve ... while retaining the two-stage concept for the time being (still without LTP, because there should be a clear distinction to Hugh's AN39, otherwise the project makes no sense at all).
Of course, I realize that you are not necessarily a friend of quirky circuit ideas - and we both know about the weaknesses of such designs, but I hope to be able to persuade you to support us.
Make Alpha-Nirvana-Killer a great success;
later we will devote ourselves to the 25W-Krill project (with outstanding technical data, without fault or blame), but for now the twins are still cooking up a fiery stew.
kind regards,
HBt.
do we want to work together to optimize the existing dimensioning, compensation and protective measures?
I would be delighted if we did, so that the B-Babe could become a joint forum project. I have laid the start, or rather the foundation stone.
Now that Babe is working without visible blemishes, the next phase of this fun project is on the agenda - optimize, improve ... while retaining the two-stage concept for the time being (still without LTP, because there should be a clear distinction to Hugh's AN39, otherwise the project makes no sense at all).
Of course, I realize that you are not necessarily a friend of quirky circuit ideas - and we both know about the weaknesses of such designs, but I hope to be able to persuade you to support us.
Make Alpha-Nirvana-Killer a great success;
later we will devote ourselves to the 25W-Krill project (with outstanding technical data, without fault or blame), but for now the twins are still cooking up a fiery stew.
kind regards,
HBt.
Attachments
@hbtaudio, possible and very valuable improvements that could be made without inflating the component count
were already mentioned, let see how your current builds pan out and pass the audition test and we ll see if anything
more is necessary, eventualy in #206 Q5 would also require a compensation cap just like Q10, also what R30/C16
are used for..?.
Anyway that s very good looking amps that you have here, nice work indeed.
Regards as well.
were already mentioned, let see how your current builds pan out and pass the audition test and we ll see if anything
more is necessary, eventualy in #206 Q5 would also require a compensation cap just like Q10, also what R30/C16
are used for..?.
Anyway that s very good looking amps that you have here, nice work indeed.
Regards as well.
On the question of the actual implementation, the housing structure
Based on photograph #201, you can already guess what Beelzebub /babe (could) look like in the end.
Four standard heat sinks form four corner pillars, the amplifier PCB docks between them, a perforated steel plate fills the resulting gap - of course, the ribs should be vertical and not horizontal, but then you have to have a custom-made extruded heat sink.
We already have now our side parts of a stereo amplifier housing on the right and left. A beautiful aluminum front panel screwed directly to the heat sink ... and so on.
The result is a handsome cuboid, perhaps even a cube. The power supply unit would then have to be built in the middle in a tiered style ... of course make sure there are sufficiently dimensioned ventilation slots at the top and bottom.
Is the extravagant housing concept understandable? I think so. The logo could be engraved on the front panel or a small, polished brass plate could be applied.
I'm sure "Ed O. alias adason" would also like this. Which would of course make me personally very happy.
Staff wanted - a new forum project starts here
HBt.
☕
Based on photograph #201, you can already guess what Beelzebub /babe (could) look like in the end.
Four standard heat sinks form four corner pillars, the amplifier PCB docks between them, a perforated steel plate fills the resulting gap - of course, the ribs should be vertical and not horizontal, but then you have to have a custom-made extruded heat sink.
We already have now our side parts of a stereo amplifier housing on the right and left. A beautiful aluminum front panel screwed directly to the heat sink ... and so on.
The result is a handsome cuboid, perhaps even a cube. The power supply unit would then have to be built in the middle in a tiered style ... of course make sure there are sufficiently dimensioned ventilation slots at the top and bottom.
Is the extravagant housing concept understandable? I think so. The logo could be engraved on the front panel or a small, polished brass plate could be applied.
I'm sure "Ed O. alias adason" would also like this. Which would of course make me personally very happy.
Staff wanted - a new forum project starts here
HBt.
☕
You are so right, you have to test under real operating conditions, for example with a small two-way reflex box, nominally Z = 8 ohms. This is the only way to know for sure whether the power amplifier can also handle the EMF or various phase rotations.
At the moment, however, I'm tied up with other things - so sound descriptions (as they are purely subjective and dependent on the form of the day - I'm not a big fan of flowery descriptions) will have to wait indefinitely on my part.
At the moment I'm listening to the current new edition of the MF-A1 -> and I wouldn't know how to describe the sound correctly in order to do justice to an entire circuit. Yes, I would already have the standard vocabulary up my sleeve ... I can only really say one thing about it, not one of my amplifiers sounds like another ... but they are all excellent.
Perhaps Ed O. can use his expertise to provide more reliable information about the sound experience - I hope that @adason will set up a Beelzebabe for himself in order to make extensive comparisons ..!
In conjunction with R27!
That's a damn good question and one I've been waiting for. Well, with the resistor ratio selected, it does next to nothing - it's really just an option, a reminder to myself. Now it's a sign or a signature. In the style of the legendary ReVox A78 MK III.
#
As a mono setup,
I could also well imagine two rooks - as a chess player 🙂.
Anyone who feels called to work on this amplifier project should do so. It's simply much more fun together.
Greetings,
HBt.
I would love to, but i am in the middle of house sale, my stuff is in boxes. It will be a while...You are so right, you have to test under real operating conditions, for example with a small two-way reflex box, nominally Z = 8 ohms. This is the only way to know for sure whether the power amplifier can also handle the EMF or various phase rotations.
At the moment, however, I'm tied up with other things - so sound descriptions (as they are purely subjective and dependent on the form of the day - I'm not a big fan of flowery descriptions) will have to wait indefinitely on my part.
At the moment I'm listening to the current new edition of the MF-A1 -> and I wouldn't know how to describe the sound correctly in order to do justice to an entire circuit. Yes, I would already have the standard vocabulary up my sleeve ... I can only really say one thing about it, not one of my amplifiers sounds like another ... but they are all excellent.
Perhaps Ed O. can use his expertise to provide more reliable information about the sound experience - I hope that @adason will set up a Beelzebabe for himself in order to make extensive comparisons ..!
In conjunction with R27!
That's a damn good question and one I've been waiting for. Well, with the resistor ratio selected, it does next to nothing - it's really just an option, a reminder to myself. Now it's a sign or a signature. In the style of the legendary ReVox A78 MK III.
#
As a mono setup,
I could also well imagine two rooks - as a chess player 🙂.
Anyone who feels called to work on this amplifier project should do so. It's simply much more fun together.
Greetings,
HBt.
We all can get busy building - or think about marginal assembly options. I think I'll work on the present test layout and realize a few additional decision options (like the magic R30-C16-R27 combination ... and other).
A power supply, as well as DC protection, et cetera are still missing ... which diode should I provide as a freewheel type?
Exciting!
A power supply, as well as DC protection, et cetera are still missing ... which diode should I provide as a freewheel type?
Exciting!
Attachments
Another PCB, Gerber-files
I have tried to combine all the topologies of the first stage discussed so far on a complete test PCB. With this board it should be possible to realize all options.
Depending on which components you use (omit) and solder in, you realize different front ends, first stages, so it is possible to test @lineup or @wahab 's recommendation without difficulty.
I hope my nocturnal, manual trace drawing is error-free - wish all the courageous self-builders lots of fun and enjoyment with the twin pair Beelzebub and Beelzebabe,
HBt.
I have tried to combine all the topologies of the first stage discussed so far on a complete test PCB. With this board it should be possible to realize all options.
Depending on which components you use (omit) and solder in, you realize different front ends, first stages, so it is possible to test @lineup or @wahab 's recommendation without difficulty.
I hope my nocturnal, manual trace drawing is error-free - wish all the courageous self-builders lots of fun and enjoyment with the twin pair Beelzebub and Beelzebabe,
HBt.
Attachments
Addendum to version 1.1
Unfortunately, I have again forgotten the freewheeling diodes D5,6 and also the coupling capacitor C10. But that can be solved quite easily by improvising - at some point there will be three boards as assemblies anyway: SoftClipper, 1st stage, 2nd stage ... and the power supply unit and the over-located protection circuit with output relay ..!
greetings,
HBt.
PS
I don't have to be a lone fighter, consolidations are welcome.
Unfortunately, I have again forgotten the freewheeling diodes D5,6 and also the coupling capacitor C10. But that can be solved quite easily by improvising - at some point there will be three boards as assemblies anyway: SoftClipper, 1st stage, 2nd stage ... and the power supply unit and the over-located protection circuit with output relay ..!
greetings,
HBt.
PS
I don't have to be a lone fighter, consolidations are welcome.