Not just any amp. I know how to do it and it is not only time to prove
myself, my Sansui fried

So I need an amp. Going in, I want to protect my speakers, and my
design will never distort. The gain stage that accomplishes that is
shut down until it is needed, and there are other factors as well. If
I pour myself into it, I will use this certain power trnasformer. This
thing is bad to the one. It maintainms + and - sixty something volts
even under a four ohm load on both sides. Cranking this thing up could
blow a breaker in the main box, and did so. I think this is about one
of the best I have ever seen. Highest power output.

Thing is I have these speakers that I really like that can't handle
all that juice, so I intend to put in a limiting system. I have given
some thought to this.

Since it has to work into low impedance I am thinking really hefty
trasnsistors, three pairs of them per channel. And regulators,
switchmode regulators.

I intend to make ananalog algorithim. I want to make it whaere you can
select the maximum power output, and it will regulate the rails down,
but still provide a bit of instantaneous power. I intend to do this
all in analog.

The maximum power of this amp will be about 263 watts per channel into
eight ohms, What I want to do is to protect my speakers. So I intrend
to build in regulatiors. I am wrestling with the algorithm now. Do I
detect current or voltage ?

The deal is this, there will be three pairs of outputs in each
channel. There will also be three swictmode FET regulators feeding
each bank of them. This is to limit power. This is to save the
speakers I like.

Now the idea here is to give it alot of oomph. I want to deytect when
the woofers are in over-excursion, and limit it to that. That user
will have power levels to choose from, and that is the max, but then a
lower average power is selected and the amp couold have as much as
+12Db dynamic headroom.

To do this, The regulators will have to operate at at least 100Khz.
Maybe higher. I need top keep ahead of the demand. I want the impact
my subwoofers can deliver, but I do not want to destroy my tweeters.
This is a tall task in the analog domain, but I think I can do it.

Now to provide the dynamic headroom, heretofore unseen on Earth, I
will have to build a time constant into it. I will have to tkae into
account what my speakers can tak as wel as the ouput devices, actually
moreso.

It is time, I am getting to the pimt where I really want to do this. I
know I can. I have a very different bias cicuit that is tolerant of
supply rail changes, I did find a wat to compensate. I know how to use
commutator switches and efven analog commutators, but thet is not the
direction I want to take. I want to give my amp alot of headtroom so
it never distorts. Impossible you say ? I have already designed it.

Even some generic 829 can do it, the trick to keep the distortion down
is to keep the gain stage out of the loop untill and unless it is
needed. In other words the 829 just shuts up until it is time. It will
add a bit of residual noise but that is all.

But this is more advanced, I want the power supply to tradck the
audio, and provide a PREDETERMINED amount of extra power for a very
short time.

Don't get me wrong, set this thing to max and you got over 500 watts a
channel into four ohms. It would be 600 into my speakers but it will
never see that level unless I go spend money on something else.

My speakers are good enough that I wnt to keep them, and they are good
enough to land me in jail. How much more power do I need ? But I would
consider this a personal achievement, to build this.

We are talking twelve really good bipolars, twelve high speed FETs and
four coils alomg with a few high performance lower capacity filters.

I mean I want to detect when a woofer cone goes out of the magnetic
field via current monitoring. I have never seen an amp do this right.
I mean in a real time way with no digital. And this is only for the
bass. I got plans for the rest of the audio spectrum as well.

JURB