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Old 11th July 2011, 08:57 PM   #81
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Default Some more pictures.

regards,

Carlos
Attached Images
File Type: jpg Placa por baixo.jpg (85.7 KB, 452 views)
File Type: jpg Poor man silk screen.JPG (213.1 KB, 440 views)
File Type: jpg Silk detail.JPG (237.2 KB, 410 views)
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A Darlington audio amplifier, a toy for your weekend enjoyment; https://www.youtube.com/watch?v=yk0qvkwsAOY, No overshot; https://www.youtube.com/watch?v=CEgK4l0MH8k
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Old 12th July 2011, 07:15 AM   #82
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Default What made the sound different compared to the original Blameless?

This combination of CCS and bootstrap..... watch parts marked with green lines.

regards,

Carlos
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File Type: jpg What made the sound different compared to Blameless.jpg (91.3 KB, 371 views)
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A Darlington audio amplifier, a toy for your weekend enjoyment; https://www.youtube.com/watch?v=yk0qvkwsAOY, No overshot; https://www.youtube.com/watch?v=CEgK4l0MH8k
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Old 12th July 2011, 07:45 AM   #83
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Originally Posted by destroyer X View Post
regards,

Carlos
you have a very nice technique.fast and effective.no need for computer and software.I salute you!
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Old 12th July 2011, 10:56 AM   #84
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Default Oh! finally a friend recognize this is a nce diy way to do things

Exactly...all i need is a nail polish and copper boards...no computer, no board manufacturers...only hard work.

I have waited 20 seconds to rtch this board, and copper was thick...because of the chemical i am using...50 percent of hydrogen Peroxide (grade 40 of agua oxigenada) and 50 percent of hydrochloric or muriatic acid or spirits of salt

Thank you as you have made my day.... please inform your country my dear downranger.

Here you have it assembled and playing.....digital camera recordings does not make justice....treble is hair rising because of emotions this amplifier drives you.

YouTube - ‪MKIII Hx - one more assembled and tested‬‏

regards,

Carlos
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Last edited by destroyer X; 12th July 2011 at 11:09 AM.
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Old 12th July 2011, 11:39 AM   #85
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What I wrote was not critic, just suggestion to save some from picture I see tin. And it is wary easy if you have printer and PC
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Old 12th July 2011, 12:04 PM   #86
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Quote:
Originally Posted by destroyer X View Post
Exactly...all i need is a nail polish and copper boards...no computer, no board manufacturers...only hard work.

I have waited 20 seconds to rtch this board, and copper was thick...because of the chemical i am using...50 percent of hydrogen Peroxide (grade 40 of agua oxigenada) and 50 percent of hydrochloric or muriatic acid or spirits of salt

Thank you as you have made my day.... please inform your country my dear downranger.

Here you have it assembled and playing.....digital camera recordings does not make justice....treble is hair rising because of emotions this amplifier drives you.

YouTube - ‪MKIII Hx - one more assembled and tested‬‏

regards,

Carlos
I have seen your MKIII video in you tube with only one pair of output.Can't wait for the completed version with multiple output transistor.sounds GOOD on my headphone .Congrats!

You know Carlos I envy you and others when I see their completed amps. on post.In my place where I work as foreign worker even ferric chloride is very hard to find and most of my co workers says its illegal to sell it here.I'ved search on internet for possible replacement and you have proved that to me that it works using agua oxinada and muriatic acid.

Can't wait to get back to my country.
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Old 12th July 2011, 12:39 PM   #87
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Default I felt curious about your country, because the passion you have made me

think you may be latine....and i love to check these things...to study the way people feel and react.

Hydrogen Peroxide, or agua oxigenada is used by woman to light up their hair colour....also surfers in my place use it and go to receive sunlight to become blond.... hehehe....so, it is easy to find in drug stores.

The acid is also easy (here) as it is used for cleaning purposes...it removes rust from metals and also can remove paint from cement and concrete, even dry paint can be removed...so, it is used for building construction, cleaning and reform .... also easy (here) and cheap .... cost is around 2 USD a litter....and you spend just a small ammount each time, just to cover the board that must submerge into the liquid....acid itself , and alone, can do the job...but the free oxigen from the hydrogen Peroxide is catalytic, acelerates reaction and dissolves copper in 20 seconds.

regards,

Carlos
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A Darlington audio amplifier, a toy for your weekend enjoyment; https://www.youtube.com/watch?v=yk0qvkwsAOY, No overshot; https://www.youtube.com/watch?v=CEgK4l0MH8k

Last edited by destroyer X; 12th July 2011 at 12:44 PM.
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Old 12th July 2011, 12:41 PM   #88
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Default No problems Josip, despite i am a little neurotic, i have

understood your intentions...was clear to me that you had no intentions to bother.

regards,

Carlos
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Old 12th July 2011, 01:05 PM   #89
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Quote:
Originally Posted by alex mm View Post
.... this time I made thinks much better , I have split the GND exactly in two, power ground and signal ground as Rudi Ratlos sugdested in PM .Thank Rudi
Alex.
Hi, Alex!
Could you please post the latest layout files so people can start thinking of building this beauty? Some guys are asking for them, and I would like to help.
Thank you very much!
Regards,
Max.
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Regards,
Andres
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Old 12th July 2011, 01:22 PM   #90
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Default Yes Alexandru, you can release black and white images to allow people to etch

boards at home.

I am trying to increase recording quality, the camera's microphone is at the top of the camera, this results it captures more the ambience sound than the direct sound...i have pointed camera downwards in order to force the microphone cartridge to face tweeter and midrange drivers, then i had slightly better results.

My tweeter is not high quality..it is an old plastic diafragm tweeter that i captured from Bravox two way automobile speakers.... so... i already have losses there.

This camera encodes in wave format but with 8K or 12K sample...this is unable to record tones of high frequencies.... this mades recording almost absent of high frequencies.... i do think it is recording till 5000 hertz and anything more.... not very good to show the treble that is something from outspace.

I am using 100pf in the compensation..and i think 82pf may be even better as i have tried in the first prototype.... silver mica there, please.

YouTube - ‪MKIII Hx.‬‏

regards,

Carlos
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Last edited by destroyer X; 12th July 2011 at 01:24 PM.
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