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Old 8th June 2012, 01:22 AM   #6021
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Putting the Fets in a loop.
Why not !
Dream on Frans while you are awake !
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Old 8th June 2012, 07:31 AM   #6022
FdW is offline FdW  Netherlands
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Quote:
Originally Posted by FdW View Post
This is what I came up with (I do not want to start a new thread on this, but still I want to show the 'thing', so here it is), I guess I am spending to much time at the ATL

What about this, I can do 70 Watt class A in 4 Ohm (or 150 Watt class A in 8 Ohm bridged). The amplifier has 14 components (and that includes the loudspeaker). The simulation FFT shows first harmonic at -100 dB or better (that is at clipping and at 10 Khz). There is no global feedback. There are no capacitors in the circuit.

So that is what I get when I cannot sleep. Maybe now I get some sleep ...
One thing more about the circuit, the amplifier delivers power by:

Pout = I * I * R (normal amps do (V * V) / R ).

This will give a different listening experience (due to the fact that (for a normal loudspeaker (system)) R is not constant over the frequency range) than with a ‘conventional’ amplifier.
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Old 8th June 2012, 02:21 PM   #6023
RCruz is offline RCruz  Switzerland
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I like it. The complexity lies on the psu.
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Old 8th June 2012, 03:13 PM   #6024
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Frans, do you like to build it or is this just a circuit idea ?
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Old 8th June 2012, 03:24 PM   #6025
FdW is offline FdW  Netherlands
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Quote:
Originally Posted by Joachim Gerhard View Post
Frans, do you like to build it or is this just a circuit idea ?
I’m thinking about it, but at the moment I am building the other amp that I showed the board for (the board is ready and ordered (10 pcs)), and at work it is make or break (my work planning until September looks like 70 or more hours/week), so it is difficult (to say the least).

On the other hand, yes I would love to build it. I’m intrigued by it, I have never ever seen something like it (most current delivering design do float the loudspeaker to measure current, and thus cannot be bridged).

The figures are also very intriguing, as noted by other people, the complexity lies in the power supply, and I can do that (power supplies ). Maybe a smaller 100 Watt bridged version (running of 30 Volts +/-) would be nice.

Anyway, not at this moment, but for sure at the end of the summer, I think it should be build. If someone else is willing to give it a go, then we should start a new thread and I will support it (at this moment).
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Old 8th June 2012, 03:38 PM   #6026
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Yes, we should do a thread about power amps. My research into Phono- and Preamps is more or less done and i got interested in power amps. That is not my forte but i managed to build a good sounding Simple Symmetric and i am contribution on Lazy Cats thread.
Does the amp from Post 6020 need a constant impedance over frequency from the speaker ? If not, then this is really new or at least i have not seen it.
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Old 8th June 2012, 03:39 PM   #6027
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Quote:
Originally Posted by Joachim Gerhard View Post
I talked about the Thats balanced line drivers and receivers.
I use them with very good results. Here is a paper about the technology :http://www.jensen-transformers.com/an/ingenaes.pdf
If one listen to recorded stuff chances are that sound came from those if not from 5532

Pitty about ofset of That stuff (who beter than you to get around it?)
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Old 8th June 2012, 03:48 PM   #6028
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That all signals have passed through an NE5534 or similar is not universally true.
Neve was involved in developing the NE5534 but the way he used them in the famous boards from the 70th and 80th was not simple using that Opamp but as far as i know he biased them into class A and skipped the output stage. Older boards had tubes and modern boards sometime have discrete building blocks. Of cause there are many audiophile recording that go straight into the recorder or are cut direct to disc.
I did not have offset problems with the Thats chip i use. I use the 1200 series as Balanced to Unbalanced converter in the commercial Suesskind Rauschfrei without that problem.
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Old 8th June 2012, 03:59 PM   #6029
FdW is offline FdW  Netherlands
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Quote:
Originally Posted by Joachim Gerhard View Post
Yes, we should do a thread about power amps.
I would like that. I will be there, and when I have build the first 'final' of the current amplifier that I am building then I will publish it there.

Quote:
Originally Posted by Joachim Gerhard View Post
My research into Phono- and Preamps is more or less done and i got interested in power amps. That is not my forte but i managed to build a good sounding Simple Symmetric and i am contribution on Lazy Cats thread.
I did see you there (I'm lurking only) (once I did show my version of a SSA). Simple Symetrical Amplifier

Quote:
Originally Posted by Joachim Gerhard View Post
Does the amp from Post 6020 need a constant impedance over frequency from the speaker ? If not, then this is really new or at least i have not seen it.
To deliver constant power to an actual loudspeaker it would, but this is also true for any other amplifier. But this one delivers power as I * I * R and that makes it different. Most (if not all) loudspeaker systems are tuned for (V * V) / R amplifiers (most of them). Due to this difference, there will be a difference of sound between amplifiers of their types when connected to loudspeaker systems that do not have constant impedance (for better or worse).

Maybe an amplifier like this should drive a transformer coupled loudspeaker

Last edited by FdW; 8th June 2012 at 04:05 PM.
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Old 8th June 2012, 05:01 PM   #6030
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Thanks Frans for the link to your version. I missed that contribution.
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