Dx Blame ES .... based into the Blameless, i am trying a new amplifier - Page 103 - diyAudio
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Old 21st March 2010, 09:59 AM   #1021
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Default Unstabilities, in the original Dx Blame ES (almost Blameless from Dr. Douglas Self)

was when i was injecting high frequencies (20 Khz) with high levels and square waves...over difficult loads, low impedance in the output, the capacitor to force unstabilities.

You know..square waves saturating, generating harmonics, above clipping or in the threshold of clipping.

This way the amplifier was in dangerous..usually fuses blow and something got burned...first VAS transistor or NPN driver use to burn..sometimes output gone too...i had a basket having dozen dead transistors inside....this never happened in my life, so many continuous burns...and i have insisted because my responsability with you, diy friends and Corporation builders..... crew man.

Usually, after 4 hours working, if the amplifier do not work fine, i use to abandon...to dismount, and to close the chapter.

High frequencies can happens if you use the amplifier together a mixer and a microphone....the microphone feedback (microfonia) can drive the amplifier to blow..also distorted guitars and samples using high output levels...or musical programs , the modern ones, where distortion is there in the music..

People can use the Dx Blame ES for years long and never face troubles....also i have used and have never faced troubles...but when you put it under test..low impedance loads, generator in the input...watching the scope screen, then we could see some strange things superimposed to the waveforms..we use to call oscilations..and triggered by the signal.

The last schematic, the Dx Blame ST, DOES NOT HAVE THESE ARTIFACTS, THOSE STRANGE SUPERIMPOSED SIGNALS.

regards,

Carlos
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Old 21st March 2010, 10:09 AM   #1022
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Default Some Dx supplies to your fun.

Switching power supplies will enter protection mode when you do that.
ahahahahahaha!...not a good toy to be playing with.

http://www.youtube.com/watch?v=PW7jfHCuIbI

YouTube - Electronic supply load test 5A

YouTube - Dx voltage regulator, 5% instead of 28% losses.

YouTube - Dx Supply test II, 5% regulation, 350 Watts

Dx Corporation..the only one has audio visual aids for communication purposes.

regards,

Carlos
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Old 21st March 2010, 10:22 AM   #1023
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Default Dx Corporation advertising, a diy free to build amplifiers, not a real business

The Dx Corporation is honored to say that their
products are extensively tested in order to anticipate,
predict, some misuse, inappropriate actions, carelessness,
distractions, intentional or destructive attitudes. pre anticipated,
bad nature people, having monstrous destructive character.. filled
with evil or ruthless.... for these ones we test extensively our
amplifiers, supplies and other circuits,in order to have
absolute certainty that they will survive in the hands of
more demanding people, as also, evil and destructive audiophiles.
Audio quality is important, also easy of construction, the follow up
to help builder is also very important..but the very first is reliabilty.

Dx Corporation Marketing Division, advertise number 32SP-04585734893-rr
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Old 21st March 2010, 03:59 PM   #1024
farjon is offline farjon  Brazil
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Hi, Carlos.

This is my Blameless ST version. The layout is based on Taj's original, with the fuses stripped in order to gain space. Work still in progress.

Best regards.
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Old 21st March 2010, 04:14 PM   #1025
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Default Very nice Sound...... pretty one!

thank you to share the picture with us.

regards,

Carlos
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Old 21st March 2010, 06:06 PM   #1026
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The funny thing, Carlos,:


Volker is still (since more than a month) using the original BlameES.

Since he will build a new one (my whale-board does not fit very well into his ALU-enclosure) he is doing everything,
every torture he can imagine to make the BlameES fail.


He has bought an expensive, professional speaker protection circuit, measuring voltage, measuring DC fraction in the audio-signal,…,
so he is not afraid of breaking his speakers.

He operates the BlameES from a standard +37/-37 V power supply.

He is playing very, very loud, very “impressive” music (Linn records, samplers, …), especially high-frequency tracks,
auto-replay mode, playing hours and hours.

Nothing happens.

His BlameES (the original one) is playing like a rock.
And it sounds absolutely beautifully, top-notch, "wunderbar".
Even bass – not a shy one.

After reading the whole story and after listening to Volker's comments I am thinking to return to the original design.

And since I will not feed a 200 Khz square-wave into the inputs or feed-back a microphone I think that I will
have a big chance to hear some extraordinary sound as well.


Best regards - Rudi_Ratlos
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Old 21st March 2010, 08:10 PM   #1027
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Default Yes Rudi, you will listen without troubles...normal music does not harm

the amplifier..some extreme uses are dangerous.

I also have used, for monthes (released December), without problems.

I found troubles watching the scope, when using generators plugged at the input, overdriving with square waves, and having difficult loads installed in the output.

Small video:

http://www.youtube.com/watch?v=K4q1frooUOk

regards,

Carlos
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Last edited by destroyer X; 21st March 2010 at 08:20 PM.
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Old 22nd March 2010, 04:07 PM   #1028
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Default The Blame eat this one (Dx Std) without make too much effort.

But even this way, the old and good Dx Standard sounds very nice too.

YouTube - Dx Amplifier - mic recording

regards,

Carlos
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Old 26th March 2010, 10:19 AM   #1029
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Carlos,can you give the latest schematic and updates of the Blame amp?
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Old 26th March 2010, 10:47 AM   #1030
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Default Post 1015 and 1016 dear Meanman....i see you have not time to read the thread

And this one is very small...... i hope you will find time to build.

The schematic, this final one, the Dx Blame ST, the most stable one!.... was not uploaded to Greg Erskine, because i am waiting Todd Johnson to find some time to change these things in his own lovely schematic.

So.... this is the reason why the update and upgrade is not in Greg Erskine pages...not to ask him to remove and to substitute by another one, professionally made, near future.

regards,

Carlos
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