Dx Blame ST - Builder's thread - post pictures, reviews and comments here please.

[niss_man]

Observe what happens with the power supply...you have two condenser in series...in between them you have ground...and this ground is connected to one of them in the positive side and the other is connected to the negative side.

Them you have two free points to filter your symetrical supply...one is positive and other is negative.

I hope this clarifies

regards,

Carlos

Yes I see Carlos. I thought the power supply circuit would have enough filtering but extra filtering on the amp can't hurt I guess.

 

[destroyer X]

People say that we need some capacitance connected to the power transistor's colector

I really believe that...but can be very small.... the standard used is from 470uf to 1000uf... the most nearby the colector leads as possible...for decoupling purposes, for stability purposes.

People have worries about some miliohms we can have from the positive and negative supply output to the positive and negative audio amplifier supply inputs.... they think this small resistance can start oscilations alike motor boating...this came from distant past i think.

Well..usually after a resistance, we always use a condenser to ground..usually small values will fit..something higher than 47uf works fine in the daily work.

After resistances, as i said..we use capacitors to ground to stabilize, bypass and decouple..... and we have rail resistances... series resistances from the main supply to the power amplifier's input transistors (circuits)...so..we need a capacitor there too.

In the real reality filled with huge ammounts or realism..if the one does not use 10 meters of cables from the supply to the power amplifier... no problems..no oscilations..no troubles...but.... we have a lot of standard things, rules of thumb, that if we remove them everything will continue to work fine..unless the one assembled the amplifier makes a lot of .... foolishes

regards,

Carlos

 

[niss_man]

Thanks for that nice informative explanation Carlos. I am learning more all the time. I also found some good videos to help learning below link.

Linear Transistor Applications - Transistors and Transistor Circuits - Video Lecture

It would be really nice if you made some youtube videos explaining your amplifier schematic (in English would be nice). Maybe you could make it like a 8 part tv series. You will maybe need to hire some actors and producers to help. You can be the director

Regards

niss_man

 

[destroyer X]

I am uploading explanation about this subject dedicated to you

Soon i will put the link here.

About the video....i think i have already made something....but very simple...camera pointing to the sceen...i do not remember if was made in portuguese or english.

Not needed to be a superproduction..what matters is to send a message that may help one or two.

regards,

Carlos

 

[niss_man]

Soon i will put the link here.

About the video....i think i have already made something....but very simple...camera pointing to the sceen...i do not remember if was made in portuguese or english.

Not needed to be a superproduction..what matters is to send a message that may help one or two.

regards,

Carlos

Fantastic. I have seen one of your videos in Portuguese. My brain could not translate to English.

 

[destroyer X]

All right, give me a couple of days and i will make it in english too

But will make it small, more details you can ask by email.

I am uploading explanations about condensers in the rails to audio amplifiers.... made for you.... so, after use, you decide if i can keep it there or if you want me to delete.

Dedicated to you, have your name ..so..you decide to keep it or not.

Condenser, in my explanation is pointed the wrong one..rail condenser, after the resistance is C14..that other one is filter to the CCS

Here you have:

http://www.youtube.com/watch?v=H9NA2173trQ

regards,

Carlos

 

[AndrewT]

........extra filtering on the amp can't hurt I guess.

decoupling on/in the amplifier is not extra filtering.

The decoupling caps are a source of instant current to meet transient current demand of the various stages in the amplifier.
Smoothing caps located at the far end of traces and/or connecting wires cannot satisfy this instant demand.

 

[destroyer X]

Dear Nissman...i am uploading 10 small videos, with awfull video quality

explaining how the amplifier works.... a very small, a short form thing that i wish will help you and some more guys.

I have made sacrifices into the video...recorded pointed to the screen in 320 by 240 frames...awfull video...but audio is reasonable and explains the stuff... make a printed copy from your schematic and then you will be able to follow.

More details, just ask me..if i can, i will help you here, or using direct mail... the video is small, a fast explanation... very simplified but shows the "mechanics" of the whole thing.... does not goes to tjhe level of details.... i cannot make it bigger...my HD is full..i cannot process big files.

They are beeing converted from AVI to MPEG and then i will upload them to Youtube...the links will be posted in this same thread.

Enjoy...i hope this helps.... soon will be posted.

regards,

Carlos

 

[destroyer X]

Here you have the first ones...how Dx Blame amp works

VAS amplifier needs 1.2 volts, not 600 mV..so...there are some small errors and the description is a short one:

YouTube - How Dx Blame amp works 1
YouTube - How Dx Blame amp works 2
YouTube - How Dx Blame amp works 3
YouTube - How Dx Blame amp works 4
http://www.youtube.com/watch?v=jv1x49jEZwo

Above you have the first 5 parts...total are nine...i am very sorry...english is not my native language

The schematic is attached, open the schematic to follow the narrative

regards,

Carlos

 

[destroyer X]

Here you have the final videos about how the Dx Blame works

Produce a schematic copy in your printer or open the schematic image at your computer screen display...follow the audio... the video image is no good:

YouTube - How Dx Blame amp works 6
YouTube - How Dx Blame amp works 7
YouTube - How Dx Blame amp works 8
YouTube - How Dx Blame amp works 9

regards,

Carlos

 

[wendell c]

Cool. I waiting for this too. I asked Carlos right after his surgery, same time I finished blame es, for a write up about its workings but timing not so great. I like videos for learning, a lot easier to comprehend. Good sign to see a lot of activity from you Carlos, your recovery seems to be well.

NissMan, may I recommended Bob Cordell's new book. It is very good and easy read. It also starts from an amplifiers conception. Mr. Cordell is also a member here on the site.

 

[doggy]

I am a little puzzled by this."the DX Blame ES sounds better"..... so we will build the ST...because???

Just asking, politely for some enlightenment, Mr.Carlos

Sorry-I should have proceeded reading the next post!!, I think I understand

 

[destroyer X]

Well Doggy, this was posted several times in the Dx Blame ES thread

This is a long story.... something connected to a politically correct movement..to politics, to strategy.

Send me an email, and i will return your message with an audio file explaining that in details.

carlos.eugenio1951@yahoo.com

regards,

Carlos

 

[destroyer X]

Please, tell me Wendel c, are there a test drive version of this book in the WEB?

I cannot buy this book..i just cannot afford...so.... if you know a site that can show some pages to me, in order to me to make a "test drive" on it....them please, let me know.

regards,

Carlos

 

[wendell c]

Carlos, no test drive that I know of. A TOC was released by Mr. Cordell to show topics that are covered on the forum on his book. Maybe a simple email to him about releasing a sample chapter?

 

[destroyer X]

Thank you Wendell c

regards,

Carlos

 

[destroyer X]

Here is the Dx Blame ES thread

http://www.diyaudio.com/forums/soli...into-blameless-i-am-trying-new-amplifier.html

regards,

Carlos

 

[destroyer X]

Earlier release to the Supercharged

YouTube - Supercharged earlier release...soon

regards,

Carlos

 

[niss_man]

Thank You

For your helpful learning videos Carlos. Don't delete them as they are a very useful study aid for anyone thinking of building a Blame amplifier. I will look into Bob's amplifier book Wendel.

Man you work fast Carlos.

Regards

Niss_man

 

[destroyer X]

You are welcome...all rigth, i will keep the video there

soon i will release the Supercharged and the MKII, with group buy for boards..amplifier boards, power supply boards and protector boards.

regards,

Carlos