analag

Hacking The Bloak
« on: March 10, 2006, 02:48:26 AM »


Was it the beer or the mary-j that made me do this.

analag
Audio engineering suffers from misinformation, disinformation, and downright lying more than most fields of endeavour.


CJ

Hacking The Bloak
« Reply #1 on: March 10, 2006, 11:53:49 AM »
Dude, grow a longer arm so you can pat yourself on the back! :grin:
You, and all the other approval junkies around here.  :razz:
If I can't fix it, I can fix it so nobody else can!
Frank's Tube Page: www.mif.pg.gda.pl/homepages/frank/vs.html
Guitar Amps: http://bmamps.com/Tech_sch.html

analag

Hacking The Bloak
« Reply #2 on: March 11, 2006, 07:46:13 AM »
Fear it not gentle people, it's only a simulation and a very good looking one at that.
CJ next time I won't share...ok?
Audio engineering suffers from misinformation, disinformation, and downright lying more than most fields of endeavour.

[email protected]

Hacking The Bloak
« Reply #3 on: March 11, 2006, 10:35:28 AM »
Yea, it would be nice to do away with the DC on the output.
CJ is especially cranky lately. Is it the low purity crack that has him suffer?

analag

Hacking The Bloak
« Reply #4 on: March 11, 2006, 12:54:34 PM »
Menopause maybe, CJ a little estrogen could help
you out with them hot flashes, me boy.
Audio engineering suffers from misinformation, disinformation, and downright lying more than most fields of endeavour.

Svart

Hacking The Bloak
« Reply #5 on: March 11, 2006, 01:36:47 PM »
analag please share, I enjoy checking out your designs!
Welcome to the GroupDIY leper colony! when something falls off, we just replace it with a tube!
occupation: General Electron Mayhem

Alesis X2 information repository:
http://www.theopiumdenproductions.

CJ

Hacking The Bloak
« Reply #6 on: March 11, 2006, 02:52:23 PM »
It's March Madness.
I noticed it elsewhere, so I am trying to blend in.  :grin:

They say this is the best time to take a vacation, the first or second week in March, because thats when you have had just about enough of cabin fever and getting outside will do the most good.

I broke into Longs, so I am back in chill mode.
 :razz:

Nice circuit.

Why does everybody use those 0.1 cent 4148's for critical temp and bias compensation?

what about a precision ref?
oh, we need that drift. doh on me.

don't they spool off all over the place as far as fvd?

oh, those are zeners, sorry.
i would ditch the zeners.
put an ammeter on one and see what i mean.
if you starve them, they start to "zener".
If I can't fix it, I can fix it so nobody else can!
Frank's Tube Page: www.mif.pg.gda.pl/homepages/frank/vs.html
Guitar Amps: http://bmamps.com/Tech_sch.html

analag

Hacking The Bloak
« Reply #7 on: March 15, 2006, 07:18:18 AM »
Tomorrow I will build this version of the Bloak, just to confirm that I did what I set out to do.

Remove the DC from the output thus the large output cap.

The Bloak is a celebrated amp in it's original state and no disrespect to it, but a tweaker I am, so why not?

analag
Audio engineering suffers from misinformation, disinformation, and downright lying more than most fields of endeavour.

Svart

Hacking The Bloak
« Reply #8 on: March 15, 2006, 07:53:05 AM »
I'm interested.  I need a non-differential amp for some apps.
Welcome to the GroupDIY leper colony! when something falls off, we just replace it with a tube!
occupation: General Electron Mayhem

Alesis X2 information repository:
http://www.theopiumdenproductions.

[email protected]

Hacking The Bloak
« Reply #9 on: March 15, 2006, 10:39:07 AM »
Rowan,

How does that Q5 thingy work? Doesn't it mirror Q2 and inject AC onto the bases of Q1 and Q7?

Cheers,
Tamas


Hacking The Bloak
« Reply #10 on: March 15, 2006, 03:49:33 PM »
I get confused easily so type slowly. Can't you get the same result of zero offset by just playing with R6 and R4 with no added parts? Would this balance drift once achieved? If so it seems the adjustment pot would also drift wouldn't it, requiring different settings for different applications?

I know there are strong views on this, but what is the real detriment to a capacitor on the output? It seems like if you had a decent capacitor things would be fine. The folks who have made this seem to like it a lot.

bcarso

Hacking The Bloak
« Reply #11 on: March 15, 2006, 04:24:54 PM »
bbl

eded

Hacking The Bloak
« Reply #12 on: March 15, 2006, 08:48:05 PM »
question...
why was it named bloak ??

analag

Hacking The Bloak
« Reply #13 on: March 15, 2006, 09:47:47 PM »
Quote from: "[email protected]"
Rowan,

How does that Q5 thingy work? Doesn't it mirror Q2 and inject AC onto the bases of Q1 and Q7?

Cheers,
Tamas


No AC is injected into the bases of Q1 and Q7, without Q5 everything falls apart. I want to build it and post the results before I get into the specifics. I'm sure further tweaking will be needed outside of the simulator.

Quote from: "thomas"
I know there are strong views on this, but what is the real detriment to a capacitor on the output? It seems like if you had a decent capacitor things would be fine. The folks who have made this seem to like it a lot.


A polypropelene cap that size is both expensive and ridiculously large. From what I hear, this amp is super sweet sounding. What if the cap was omitted?

analag
Audio engineering suffers from misinformation, disinformation, and downright lying more than most fields of endeavour.

[email protected]

Hacking The Bloak
« Reply #14 on: March 16, 2006, 12:52:47 AM »
Quote from: "eded"
question...
why was it named bloak ??


It is just a play with words. Gain Bloak = a gain block that is your friend

PRR

Hacking The Bloak
« Reply #15 on: March 16, 2006, 01:26:18 AM »
> Why does everybody use those 0.1 cent 4148's

Because we ran out of 0.05 cent 1N914s.

> bbl

Haec immatura a me iam frustra leguntur o y

skipwave

Hacking The Bloak
« Reply #16 on: March 16, 2006, 01:37:31 AM »
Quote from: "PRR"


> bbl

Haec immatura a me iam frustra leguntur o y


Too early? It's never..... :razz:

I wish I got the "bbl" reference.
Quote from: PRR
Now, maybe you don't, or shouldn't, grab the ribbon for far-harpsichord, nor the hot condenser for snare-kissing... yet often we do.

alk509

Hacking The Bloak
« Reply #17 on: March 16, 2006, 01:41:04 AM »
I actually remember that story from my wife's "Exploring The Universe" class in college!

Quote from: "skipwave"
I wish I got the "bbl" reference.


Why, Baltic Boob Lovers, of course! :roll:

Peace,
Al.

Lest laziness get the best of you!

bcarso

Hacking The Bloak
« Reply #18 on: March 16, 2006, 03:38:02 AM »
I started to mutter and then realized I couldn't do the thing justice in the available time, so I pasted it into notepad, deleted what I had written.

bbl:  Be Back Later.

bbl

eded

Hacking The Bloak
« Reply #19 on: March 16, 2006, 06:06:30 AM »
thats a cute play on words halmi.
i got another some may say stupid question.
but you can all throw rotten tomatoes at me. if you wish.
yum yum i like tomatoes fried up nearly black smothered all over blackened toast with a glass of port on the side.
my wife says i'm weird !
but just trying to learn. 12v dc and 15 v dc wall warts are a dime a dozen at dollar stores. what i like about the bloak is its elegent simplicity.
ive found in life the best solutions always are rather simple.
like if aliens do exist i bet their time warp engines are probably simple elegent designs.
could i run this bloak powered by such simple cheap wall warts ??
what cheap good sounding transformers are recommended to feed this lovely design to process low impedence mic signals ??
and how about a portable battery powered version for location recording ?? is this a possibility ??
so someone could go on safari and record lions roaring .
i used to live in africa but never had a way to capture all the wonderfull night sounds when i slept on the roof at night. by the way before you laugh flat roofs are common in africa and people like to sleep up there.


 

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