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Old 12th May 2013, 11:19 AM   #121
Mooly is offline Mooly  United Kingdom
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I've moved the Vellemann discussion here to Sakis' thread here,
http://www.diyaudio.com/forums/solid...ml#post3487303

If you want a new thread starting for it then just say so
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Old 12th May 2013, 11:34 AM   #122
tinitus is offline tinitus  Europe
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and maybe MJE340/MJE350 replacing 2SA1110/2SC2590

Quote:
Originally Posted by tinitus View Post
ZTX450/550 'replacement' might be BC546/556
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Old 12th May 2013, 01:16 PM   #123
GoatGuy is offline GoatGuy  United States
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Default PASS AB100 - Minimalist improved schematic

Feel free folks to adopt...

Resistance values are now in more familiar coding.
The "missing ground" has been added.
Crossing lines have been 'broken-gapped' for clarity.
Zener has a Vz value.
No adjustments made to actual values.

Subtle... but a bunch easier to "stare at". And that darn input ground insertion prevents the old-timer's "where the heck is the operating point of the zener?" problem.

GoatGuy
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Old 12th May 2013, 01:35 PM   #124
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Quote:
Originally Posted by GoatGuy View Post
Feel free folks to adopt...

Resistance values are now in more familiar coding.
The "missing ground" has been added.
Crossing lines have been 'broken-gapped' for clarity.
Zener has a Vz value.
No adjustments made to actual values.

Subtle... but a bunch easier to "stare at". And that darn input ground insertion prevents the old-timer's "where the heck is the operating point of the zener?" problem.

GoatGuy
Now if you could add the values to Tinnitus's drawing it would be even easier to read!
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Old 12th May 2013, 01:55 PM   #125
GoatGuy is offline GoatGuy  United States
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Quote:
Originally Posted by Zero Cool View Post
Now if you could add the values to Tinnitus's drawing it would be even easier to read!
WHICH tinnitus drawing? He's come up with 2 or more.

Its funny - maybe 'cuz I live in The Colonies (AKA America) - but I get weird feelings when I look at resistors, drawn correctly by IEEE and EU standards, as little square boxes, instead of zigzags. Every OTHER component in electronics is a symbolic representation of its "principle of action". Capacitors are separated plates, transistors are bases with emitter and collector points touching (like Schottky's original!), diodes are symbolic "electrons stop here", coils look ... like formalized coils. Transformers are obvious, even tubes are pretty clear. Switches - bars that switch, etc.

Well, "resistors" are accurately zigzags! Originally almost all wire-wrapped, the notion is, "a bunch of crumpled up conductor, thin, that gives resistance". By comparison, the square box is ... counter to all the other symbols. According to many sources, it was adopted in the 1970s because "it is easier to draw both for draughtsmen and early memory-limited computers". It hardly seems appropriate. The zigzag IS the correct representation, and the little white box ... just "lies": many little boxes in digital electronics especially harbor marvelous and obscure functionality. Indeed, one does a disservice to a digital circuit schematic of any complexity using little square boxes for pull-up or balancing resistors.

This is why I'm also not inclined to annotate Tinnitus's drawing. Call me provincial, but I think Nelson Pass's original AD2000 drawing (with broken gap crossovers) is entirely clear. And I like zigzags for poor conductors. Gotta make those electrons run, run, run! That way they get tired.

GoatGuy

Last edited by GoatGuy; 12th May 2013 at 01:57 PM. Reason: added humor
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Old 12th May 2013, 02:08 PM   #126
tinitus is offline tinitus  Europe
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so that my drawing remains worthless, and not floats around the net with wrong values or text, I have intentionally stayed away from adding any kind of values, or text
but feel free to print it out and use for your own personal use
I hope thats ok, and clear enough

same goes for the resistor chart, no text added
use as you wish

but please refer to original schematic for correct values
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Old 12th May 2013, 02:20 PM   #127
tinitus is offline tinitus  Europe
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Quote:
Originally Posted by GoatGuy View Post
Resistance values are now in more familiar coding.
The "missing ground" has been added.
Crossing lines have been 'broken-gapped' for clarity.
Zener has a Vz value.


Quote:
Originally Posted by Zero Cool View Post
Now if you could add the values to Tinnitus's drawing it would be even easier to read!
well, for that you deserve at least 'something'

I guess component numbers will be ok

btw, since bias transistor Q8 is a TO-92, Im planning a small board for it
it will be mounted with small alu plate with hole for the transistor
the hole bias curcuit can then be mounted on the main heatsink
drawing will come soon, ofcourse
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Old 13th May 2013, 12:48 PM   #128
tinitus is offline tinitus  Europe
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MJE340/350 does not appear to be very popular

but I have a few 2SC5171/2SA1930...maybe they would do ok

maybe, maybe not

getting tired

final...but still needs careful checking
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File Type: gif Pass AB100 print work layout.gif (32.5 KB, 428 views)
File Type: gif Pass AB100 print work layout.gif (31.4 KB, 582 views)
File Type: gif Pass AB100 print layout work rework 3.gif (34.8 KB, 564 views)
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Old 15th May 2013, 03:49 PM   #129
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Tinitus ...I offered again to give you a free copy of layout software ...Offer is still on !!
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Old 15th May 2013, 07:05 PM   #130
tinitus is offline tinitus  Europe
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producing boards....sounds like fun
but I better leave that to others
Im even more hopeless with computer software

but thanks anyway

just small cosmetic change
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File Type: gif Pass AB100 print layout work rework 6.gif (34.4 KB, 322 views)
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