Mmhhh
I will also do an open source schematic ( free to copy). And the AMP will use std. Components with Heavy use of smt to keep footprint Down. Basicly same footprint as the tssa, to make it easy to upgrade. 🙂
There will be two versions
1) bjt cfp output
2) mosfet output stage where it uses allfet or excicon mosfets
- Sonny
I will also do an open source schematic ( free to copy). And the AMP will use std. Components with Heavy use of smt to keep footprint Down. Basicly same footprint as the tssa, to make it easy to upgrade. 🙂
There will be two versions
1) bjt cfp output
2) mosfet output stage where it uses allfet or excicon mosfets
- Sonny
Yeah First One module will be released in January 2014, very small, high performance and compact CFA. DIY audio enthusiasts will have something to compare to, especially to their VFA-s to blow away the myth that CFA has no place in audio. Good luck to all.
Lazy will you reveal the circuit of your new design, or is this just to market the modules..??
I simulated your amp using your .asc file and models and I did get different results.
Important thing here is to be completely honest with simulated resalts.
You stated "10PPM .. 20hz - 20Khz - all loads 2/3 max power"
and this is what I've got at 100 W on 8/4 ohm load, and that is 2/3 of max power for presented schematic.
THD1k 25 ppm/8 ohm and 36 ppm/4 ohm
THD20k 34 ppm/8 ohm and 45ppm/4 ohm
THD is not only important parametar but still to big differences.
BR Damir
Lets just call deleting the last couple of posts a festive cleanup and leave it at that......
Merry Christmas
There are some great linear solid state designs, but what bothers me is there are some great sounding designs with relatively high THD. I am now working on single ended triode harmonic profile, just to see if that sound is possible by ss. Also, some Nelson Pass ingenious designs looks like ignoring THD. There is no guarantee of good sound by measurements only. And, every new idea regardless vfa or cfa or without nfb are welcome and is step forward.
Just wanna say it is great engineering here and it is fun too. Let's move on through 2014!
Just wanna say it is great engineering here and it is fun too. Let's move on through 2014!
Member
Joined 2009
Paid Member
Hey OS, Merry Christmas back to you. I like your design approach very much and although I'm up to my eyeballs in amps and can't think about starting another I do believe you should proceed with a build. What I like about your designs in this thread is that it's based on solid engineering for DIY abuse and no 'selling' going on. It gets my vote !
Hi, Dadod, that is not the first time such things happens. I had the same issue, while i run measurements twice.
I had sometimes very different results at different times... I don't believe in Sims at all.
What is strange is it seems to be always the same direction: Nobody never comes and said "He, your amp sims better than you pretend".
What can be the reasons ? Models ? Way to measure ?
New thread anyways ...
I won't post here anymore ....
New thread will be the "SLEWMASTER" -CFA vs. VFA "rumble".
There be no "controversy" . Just better "stuff".
I will be open to any improvements to the CFA "front end".
I did get multiple PPM readings , but for most of the
audio spectrum... .001% was common (.0011 for 20k).
I don't think the PCB will "destroy" performance. With google and
the awesome designs at DIYA ... many good examples of layout.
I have had my hands on Halcro's ,stealth's , and a number of overbuilt-
overpriced amplifiers.
The flatpack leach or AAK's big symasym are examples of proper
layout.
BTW , I never really got any "big return" on my designs/layouts.
If I was to do the math , only 10 cents/hour. 😱
ALL the "badgers" work , the same for anything else I would submit.
Chill out , have a happy New year ...
OS
I won't post here anymore ....
New thread will be the "SLEWMASTER" -CFA vs. VFA "rumble".
There be no "controversy" . Just better "stuff".
I will be open to any improvements to the CFA "front end".
I did get multiple PPM readings , but for most of the
audio spectrum... .001% was common (.0011 for 20k).
I don't think the PCB will "destroy" performance. With google and
the awesome designs at DIYA ... many good examples of layout.
I have had my hands on Halcro's ,stealth's , and a number of overbuilt-
overpriced amplifiers.
The flatpack leach or AAK's big symasym are examples of proper
layout.
BTW , I never really got any "big return" on my designs/layouts.
If I was to do the math , only 10 cents/hour. 😱
ALL the "badgers" work , the same for anything else I would submit.
Chill out , have a happy New year ...
OS
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I' am thinking the same way.
I think NOBODY, here, is sharing or participate for this kind of reason, or intention.
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I also must thank "lazy cat" ... the peeceebee and VSSA
were first on the LT "cutting block".
They are CFA in the simplest form , very good to learn the
topology.
In fact , the VSSA combined with the hawksford would most likely
be a 500V/us "slewmaster"(most likely faster!!). But , it also would need additional
circuitry to improve PSRR/DC behavior. NX also has lower
THD.
I have the job of doing the thermal sim's now. I suspect the
CCS's , diamond , and 2nd stage will have to be skillfully
placed (coupled) to make for a good contender.
OS
were first on the LT "cutting block".
They are CFA in the simplest form , very good to learn the
topology.
In fact , the VSSA combined with the hawksford would most likely
be a 500V/us "slewmaster"(most likely faster!!). But , it also would need additional
circuitry to improve PSRR/DC behavior. NX also has lower
THD.
I have the job of doing the thermal sim's now. I suspect the
CCS's , diamond , and 2nd stage will have to be skillfully
placed (coupled) to make for a good contender.
OS
May-be you can consider laterals ?
One of the things i like with them is, apart of letting-us free from thermal circuitry, often prone to oscillation, they compensate in a way the 'expansive' characteristic of CFAs. May-be the best balance for this topology ?
Also, they can offer, one in the other, a higher impedance (apart at very high frequencies), and free-us from more than one emitter followers (if any) to drive them ?
And, most of all, they are not prone to secondary breakdown, making the amp more reliable.
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ostripper,
Can I assume that you haven't started that thread under the new thread name yet? I looked to see so I could follow it and don't see it yet.
ps. Do you have any idea what the finished costs of components would be minus any boards?
Can I assume that you haven't started that thread under the new thread name yet? I looked to see so I could follow it and don't see it yet.
ps. Do you have any idea what the finished costs of components would be minus any boards?
Lets just call deleting the last couple of posts a festive cleanup and leave it at that......
Merry Christmas
Enjoy the quiet days of this holiday season. I am really happy to see the competitive spirit alive and well. it pushes all to do better even if it means sometimes a little pushing and shoving. many great CFA designs have come about since the beginning of this thread. thanks to all who have taken up the challenge.
Someday, someone (hint-hint) will write a book on it for DIY'ers 🙂
-Richard Marsh
Offered attention simple amplifier VFA wherein the output stage is built on the scheme Shiklai (with local CFA)
Figure 2 shows a diagram of Bode load change from 1 to 8 ohms
The diagram shows that the depth of NFB across the entire audible frequency range is almost constant.
Figure 3 shows the harmonic spectrum of the signal frequency of 20 kHz with an output voltage of 30 V (peak).
As seen from the graph of the spectrum of only one third harmonic.
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best regards
Petr
Simple has a lot to offer. have you built it, yet?
Thx-
RNmarsh
I am preparing the 2 top contenders before I start the thread.
One is the amp I posted here(NX/hawksford).
The other is the sansui/hawksford.
Nearly the same component count as the "badger" ..
around $50 apiece (per amp).
When I start the thread ...
1. - Input on the actual circuits , I might have missed something.
2. - Begin to actually create. On the Badger , member input
was valuable ... a lot of the layout decisions were NOT mine.
3. - IF it is decided to go modular , we can really have a lot
of real world "fun" , as I have the layouts already for dozens
of "front ends" 😎😎 .
4. - Any and all suggestions will be explored (or dismissed) ,but
with valid objective reasoning.
I have most of the material - thread will be started.🙂
OS