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Old 7th August 2011, 10:32 PM   #91
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OK, nice. Sweet dreams
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Old 7th August 2011, 10:54 PM   #92
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Default Yes.... better to keep this way..people can try and listen

the small distortion in the reality means nothing...it is not something bad.... there are lovely amplifier that distorts even more than that...the harmonic distribution is even more important.

Let's wait someone to assemble and report the audio quality..then you can decide if will try to change something or not.

I am following step by step and simulating each idea..i do like this amplifier but i am busy to build it...also i am not very addicted to Fets, iBGTs and others...i really love BJT...i feel myself at home with them.

Thank you... relax as you are in the sea..feel the fresh air in your lungs..... here is really hot these last days.

regards,

Carlos
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Old 8th August 2011, 09:27 AM   #93
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Quote:
Originally Posted by destroyer X View Post
Thank you... relax as you are in the sea..feel the fresh air in your lungs..... here is really hot these last days.

regards,

Carlos
Thanks Carlos, the sea today has very strong harmonic activity accompanied with fresh wind, very refreshing.
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Old 8th August 2011, 09:27 AM   #94
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Default Deviation - general anomaly

Distortions are always present in analog amps, we could even say that there is only one general anomaly-distortion and that is Deviation - any possible difference from the original signal, except the gain factor. Deviation includes all measurable and unmeasurable details differentiate from the details of a signal present at the input. We would be quite sure that we are dealing with the perfect amplifier if deviation would be zero, but in the real world we have to be pleased with acceptable approximation only, the one which is acceptable to our measuring system - human brains. This one aproves everything better than the threshold level of our acceptance, so very forgiven factor. As long as any amp is over or better than this criteria I am pleased with it and this one belongs to that category.

So by this amp I am not worried about numbers not achieving five zeros, cause I experienced listening test and experience from other competent DIY-ers will also be relevant to evaluate the real value of this design.

I am also pretty sure that the main core of this schematics, feedback loop circuit around input pair, is very promising and can be expanded to more complex, precise designs at any time.

Last edited by Lazy Cat; 8th August 2011 at 09:34 AM.
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Old 8th August 2011, 09:49 AM   #95
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Default Interesting the therm used..... last time i heard about

deviation was while i used to adjust FM transmitters.

Yes...make sense to me all you said....but try to convince people that numbers means nothing...you will see them giving you a small smile and they will be thinking we are crazy...they believe in numbers.

They will think you are crazy cat in the place to be lazy cat...one thing is reality, other thing is what the majority of audiophiles thinks about.

There are some guys that has the faith connected to numbers....some of them say (and really think this way)... and they are not one or two..they are majority.

- If an amplifier measure good, then it is good....if numbers are small, then sound is good.... well...i strongly disagree..but they do not care about.

You do not need to convince me...i am already convinced about that since seventies...problem is to convince people...they will give us an yellow smile when we say that and will go away thinking we are retarded or something alike.

I can assemble to have fun, to my own use... but i would not waste my time offering high distortion numbers to the community because design will be snobbed...and happened tenths of times...i could see this happening.

If possible to reduce numbers..then do it...this way your lovely design will be much more accepted...one thing is reality..other thing is the reality people see inside their minds....that other reality is based in beliefs, prejudices, faith and audiophoolery.

Take a look at these videos...convince these guys if you can...i would not even try:

http://www.youtube.com/watch?v=m7ERMu825m4

http://www.youtube.com/watch?v=xs1aUws0Lrs

regards,

Carlos
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Last edited by destroyer X; 8th August 2011 at 09:54 AM.
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Old 8th August 2011, 04:42 PM   #96
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Lightbulb PSSR enhanced version

As the sea is rough today I found some time to draw PSSR enhanced version which already includes BIAS and OFFSET trimmer control in a simpler manner. Better PSSR is achieved by LM317/337 L series regulators (100mA output current version) enables -80dB ripple rejection on their outputs. Proper bias regulation is made by changing their output voltages symetrically and offset by balancing their output voltages according to GND. So only two TO-92 devices were implemented instead of zeners but with much more stable amplifier DC conditions and elegant BIAS-OFFSET control.
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Old 8th August 2011, 05:33 PM   #97
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Default Nice... very nice.

regards,

Carlos
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Old 8th August 2011, 05:36 PM   #98
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Kudos. Very very nice circuit.

Can not await to see the first PCBs layouts

1543
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Old 8th August 2011, 05:53 PM   #99
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Lazy Cat,

the worst thing one can do is to design the perfect amplifier in 24 hours. I would like to suggest this amplifier to remain simple and not deviate from the original design at all for now and allow it to evolve over time to become a great piece of audio equipment.

I believe you have sown a seed by offering something different and those building it will be very happy and those with the ability will come with suggestions, upgrades and improvements that can be implemented over time.

Nico

P.S. JHL and Higara's amps became classics and can be refined, but the originals remain just that originals. Not great specs but a music lovers amp

Last edited by Nico Ras; 8th August 2011 at 05:57 PM.
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Old 8th August 2011, 05:56 PM   #100
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Default I do think the same as Nico.... i found second and third ideas

worse in the simulator....now more second harmonics...the first layout was the best one in the simulator..of course real world can be different.

I have just simulated the third one...this one you publish a few minutes ago...was the worst one in the simulator.

Well.. simulator does not play music....it is just numbers.

regards,

Carlos
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