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Old 2nd May 2012, 03:02 AM   #1191
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Nope. Unable to simulate the instability. I even updated transistors SPICE simulation models in my simulator with the ones from the manufacturer's itself (I use OnSemi).

Although the transistors weren't matched, I ordered them from a big well-renowned USA reseller, so I doubt they'Re counterfeit...

Well, even though my "high bias" test were not conclusive, I still like the quality of what I hear at the low bias setting.
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Old 2nd May 2012, 11:37 AM   #1192
AndrewT is offline AndrewT  Scotland
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ONsemi models are renowned on this Forum to be bad models.
PCB parasitics play a big but absent role in simulations.
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Old 2nd May 2012, 11:55 AM   #1193
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Quote:
Originally Posted by canonnica View Post
I've enver seen any consensus on any amp, either DIY or not...
There you go, part of the problem is that a amp is just a part of a complete system. Some amps work better with certain sources than others. This being a blameless type is best suited for vynil sources, cold sounding CD players will sound terrible with it.
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Old 2nd May 2012, 03:27 PM   #1194
a.wayne is offline a.wayne  United States
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Quote:
Originally Posted by canonnica View Post
Nope. Unable to simulate the instability. I even updated transistors SPICE simulation models in my simulator with the ones from the manufacturer's itself (I use OnSemi).

Although the transistors weren't matched, I ordered them from a big well-renowned USA reseller, so I doubt they'Re counterfeit...

Well, even though my "high bias" test were not conclusive, I still like the quality of what I hear at the low bias setting.
I 'am of the belief if it was the design , the instability would show in spice . Could you describe what you are using for source and speakers , what are you comparing the sound to ? Other DIY design or is it a production amplifier...
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Old 7th May 2012, 08:19 AM   #1195
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Default I see that Cannonica is not that happy, it seems he was not satisfied

Well..... what can is say?..... a lot of guys have appreciated my amplifiers...but i cannot satisfy everyone...there are demanding guys too, and also some circuit troubles may happens because of parts.

Cannonica, and looks that A. Wayne are dissecating the unit.... impressive design knowledge you have folks...i deeply envy you because your skills and i am thinking what a pity that you have not made an amplifier for us...you have the tools to make it even better i think.

There are many different types of minds...some are analitic, some other guys are centered in feeling, sound experiences...listening tests..... the analitic is precise in the Mathematics, the good uses for design...they are all good and complementary if they figure out a way to work together in harmony, because usually they do not appreciate one each other.... we humans do not like differences.

I was arguing with wife these days because of blood and body fluids drain i have connected to my groin..... i am measuring 24 hours period of time... each day i have how many mililiters of material is going out from my bely (now flatten bely thanks god!).... sometimes i take note 25 hours since i have empty the bottles, sometimes 22 hours...sometimes 24 hours.... and one day i have measure 20 hours..... and all that stuff i am calling a "day".

Wife enters panic and said i am making a big mess...she said:

- "to inform the doctor you may do it precise"

I said that this is not needed, because the measurement technique (marks in the bottle) is not precise, and the doctor must know how big it is compared to 40 mililiters that is his dead line to remove the drains from my body...if 140, or 150, or 120, or 130 is not that important...the target is 40....so...if i am so distant from the targed, the minimum quantity that will make the doctor decide to remove the thing, does not matter is it is precise or not.

Also he decide by the colour of these fluids that may be light yellow alike urine.... without blood...or with small ammount of blood (rose)...... how precise is the measurement when i am so distant from the target is not important.

She continue to say i am making a mess and the doctor will not be well informed...... you see how brain works....she is not stupid.... she is not flexible....a rigid mind that does not focus the main target..she worries about each step...goes to small details.

This is the problem sometimes...dissecating the whole thing you may find a lot of strange things...in special if you are searching for absolute precision..alike 1 milivolt off set and these things.... you replace a transistor and the offset changes.... these things are never precise alike a digital waveform...that coded sequence of pulses..this is analog electronics.... it has more or less something.

Oscilations....yeah...of course, and triggered by the audio signal..... very possible depending the transistor gain..... my scope was damaged and it remains damaged...it is possible....simulator said it is stable...what a hell..simulators are not very good to check reality...i also cannot trust on them....use the standard practices to block oscilations...in the VAS stage and in the feedback line...if you have suspections about the output (the same in several model of amplifiers make wide world) install some capacitors there to check.

Mine units are working great..no problems here....and seems other guys have assembled without complains....this must be some mistake.... some part that is not correct.... error in the capacitor maybe..the compensation one...the choice was a small value in order to extend the bandwidth...was tuned to best sound to bat listen...humans can be happy with 270pf there....make some tests Cannonica.

I am feeling some sadness....... you and Wayne not that happy.... a pity that...you are one of the most exciting guys that have deep passion by audio amplifies.... Cannonica is an artist of photography....i have a lot of respect by you two..... bad luck to uncle charlie to have you not happy with my amplifier..... what a pity.

Hundreds have made my amplifiers and felt deeply happy....i could not make you happy.... and the most vibrating guys.... well... we cannot he happy all the time.

Go ahead searching for parts mistake, increase stability capacitors, install one in the NFB.... try something.... i hope you gonna find something wrong.

regards,

Carlos
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Last edited by destroyer X; 7th May 2012 at 08:25 AM.
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Old 7th May 2012, 03:00 PM   #1196
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Default Here is a video about

Dx MKIII Hx - YouTube

regards,

Carlos
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Old 7th May 2012, 03:08 PM   #1197
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Hey Carlos?!? great to see you here again!

Who said I'm not happy?? I love the amp, I'm in the process of learning the role of each and every componant and their interactions. Also all the interrelated principles. This amp is my "daily-driver".

Martin.
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Old 7th May 2012, 03:14 PM   #1198
a.wayne is offline a.wayne  United States
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Read my comments again Carlos, I'm suggesting defective parts and it was Rudi (BMW 850 guy) who commented on the sonics , not myself or Martin ...

I have yet to finish mine , anyway congrats on the stomach , I'm taking the easy way out and going to the gym


Mas Que Nada ....
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Old 7th May 2012, 03:47 PM   #1199
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a.wayne: his first name is spelled Rudy.

Carlos: it is nice to have you back again.

Best regards - Rudi_Ratlos
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Old 7th May 2012, 04:12 PM   #1200
a.wayne is offline a.wayne  United States
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Sorry , forgot to change the I to a Y ....



@carlos: Video removed ...... !!!

Last edited by a.wayne; 7th May 2012 at 04:14 PM.
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