About This "Simple Machine"

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#81
kenpeter said:
I'm surprised you test R12 both under and over the load,
yet never occoured to you to split R12 in half? With load
and NFB tied to the midpoint? Both halves work opposite
equally, and can drive twice current swing into the load.
But this arrangement is only valid for true Class A.

The next advancement over Split R12 is to span unsplit
R12 with series pair of Schottky diodes. Tie Load and NFB
to midpoint of Schottkys, but tie no load directly to R12!
Now R12 only provides a reserve current leak that keeps
anything else but Schottkys from accidently turning off.
Capable of extremely smooth AB crossing. Really: Class
VischB (Square Law Schottky Diodes) + CCS (R12).

The bootstarp is a good idea, but Cordell warns 1500pF
extra Miller CDG when VDS is less than VGS. I take this
to mean: You may need a lot more current in the strap
to be effective, regardless what the simulation sais.
Click to expand...

The amp is assembled and is working fine! Just Fine! No sign of problem in either the amp module / speaker. I have done what I wanted to do- make the final circuit sound cleaner than the one I started the thread with. Mission complete. It sounds just a ton better and cleaner than the original. And I won't go any further; this much is enough for me, I need no more. However, I understand what you said in your post and I request you to build it with the mods you suggested and if possible upload your details/results in this/another thread. This will be helpful for others.


Thanks!
 
#82
Update...

The sound quality is damn good. But, kind of too clean... dettol... I find it hard to accept dettol in my glass of wine! 😀

The other solid state SE amp I made a couple of months ago was a zero global feedback source follower type, power output around 20watts in 8ohm. Sounds sweet, sounds spicy, sounds colorful, sounds great... great, not clean as distilled water. But like my favorite curry.

This one is distilled water.

My brother loves this simple machine's sound. He says it's a "Fantastic" and "Sparkling" sounding amp. He doesn't like the taste of distilled water though. 😀

I like to listen to it, but not for long.

Psychological thing. :checked:

This amp is no doubt superb. :up:

Just as it looked in the graph.

My favorite color is green. Neither black, nor white. hehe...
 
#84
AKSA said:
the output stage as a follower, operate it in open loop, and confine the feedback to the voltage stage only.
Click to expand...

The other SE amp I talk about has these. Don't want these on this. Please do it for yourself if you care. thanks.

The sound will change, have a good listen then.....Hugh
Click to expand...

Yup the sound will. But the project has been suspended after making the first board. I already have listened to it good. It is a good amp. Recommended for those who care for good specs.
 
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