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Old 24th July 2011, 08:56 PM   #171
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Quote:
Originally Posted by Sound_Buster View Post
Hi, OS.

1- Is there a revised BOM corresponding to the Rev. 2.1 board? Or is the last published in this thread ok? Schematics also...



2- How low the power supplies can go? Its about recycling used transformers.

Even a 28-0-28VAC (42-0-42VDC) works nice (My test trafo).An "all" current sourced amp is TOTALLY voltage independent. My AX still has 3+ ma LTP and 8.8ma VAS even at 15-0-15VDC.. Break out the E-waste...


OS
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Old 24th July 2011, 08:59 PM   #172
dadod is online now dadod  Croatia
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With a few changes distortion halves at all frequences.
dado
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Old 24th July 2011, 09:04 PM   #173
dadod is online now dadod  Croatia
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Schematic is quite unreadable, sory
C7 ->47p
C8 ->250p
R24 ->1.8k
R23 ->10R
R34, R35 ->2.2R
dado
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Old 24th July 2011, 10:03 PM   #174
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Quote:
Originally Posted by dadod View Post
Schematic is quite unreadable, sory
C7 ->47p
C8 ->250p
R24 ->1.8k
R23 ->10R
R34, R35 ->2.2R
dado

Bad PC/viewer ???

below 1 is schema - quite readable right down to a pixel.

Below 2 is CLG - different than yours. (433khz unity) 90dg. margin.

below 3 - .0005% @ 10k 40v p-p.. not bad.

different values ?? ... Hmmm ,could it be the models diverge from the real part.
MJE15032/33 will form colpitts oscillator >47R and under 10R in my triple. ON semi does not specify Cob of these parts. trial and error + square wave/load test on CRO made me settle on 22R as the best value.

If C7-8 = 47p/250p , then R15/16 = 180R for 450-550 UG point + acceptable margin. Yes, R24 = 1.8k with these C7-8 values.
To save $$ on smaller silver mica's ... YES, you could change the LTP degeneration to accommodate and have the same setup/ performance. I only used 100/430-470pF because I had a pile of them - free .

PS - you could go: tools>control panel> drafting option> font size ... to fix schema !
OS
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Last edited by ostripper; 24th July 2011 at 10:13 PM.
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Old 25th July 2011, 07:50 AM   #175
dadod is online now dadod  Croatia
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Quote:
Originally Posted by ostripper View Post
Bad PC/viewer ???

below 1 is schema - quite readable right down to a pixel.

Below 2 is CLG - different than yours. (433khz unity) 90dg. margin.

below 3 - .0005% @ 10k 40v p-p.. not bad.

different values ?? ... Hmmm ,could it be the models diverge from the real part.
MJE15032/33 will form colpitts oscillator >47R and under 10R in my triple. ON semi does not specify Cob of these parts. trial and error + square wave/load test on CRO made me settle on 22R as the best value.

If C7-8 = 47p/250p , then R15/16 = 180R for 450-550 UG point + acceptable margin. Yes, R24 = 1.8k with these C7-8 values.
To save $$ on smaller silver mica's ... YES, you could change the LTP degeneration to accommodate and have the same setup/ performance. I only used 100/430-470pF because I had a pile of them - free .

PS - you could go: tools>control panel> drafting option> font size ... to fix schema !
OS
I fixed the resolution problem, bad graphic viewer.
When you simulate OLG you keep TMC resistor out of simulation(connected before V3) and result is almost as ordinary Miller compensation. To see whole TMC influence TMC resistor has to be connected after V3, directly to Vout. If you campare to TPC simulation it will be very similar.
In this case you have this result(below 1) and 63dg. margin not bad at all.
Ah yes, I have some 47p/250p and that is why I tried with them and result is below 2.
Phase margin 65dg. .00029% @ 10k 40v p-p.. not bad.
below 3 is readable schematic as I used in the simulation. Models are yours from your site.
dado
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Old 25th July 2011, 08:02 AM   #176
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Quote:
Originally Posted by ostripper View Post
- 3 texts (instructions , BOM , and component "extended" list.)
- PCB JPG. (toner transfer)
- The LT files
- Component overview
- "Technocolor" voltage overview

Have fun , please inform of errors.

OS
I think your bom is not correct caps C17, C13 etc..
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Old 25th July 2011, 09:23 AM   #177
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And one more question. Over here is impossible to get anything with ksc suffix so can I (We) use BD139/140 instead or go to something else?
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Old 25th July 2011, 09:52 AM   #178
AndrewT is offline AndrewT  Scotland
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replace k with a 2 for the universal type.

BTW,
the ksa992 & ksc1845 are both small signal To92 type.
BD139/40 are totally unsuitable.
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Old 25th July 2011, 10:07 AM   #179
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Sorry I meant 2SC/SA here only questionable suppliers
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Old 25th July 2011, 12:37 PM   #180
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Quote:
Originally Posted by Josip_Del View Post
I think your bom is not correct caps C17, C13 etc..
Just checked overview vs. BOM vs. schematic ... BOM was right on, schema was missing C15 , and the PCB had c14 + c15 swapped. Thank you!!

Updated "package" is below,
Bom OK
-fixed overview
-fixed schema

Fixed PCB gerbers for screenprint.
PS - LT file did not have .include DIYAamp.txt .... fixed and tested.
any other errors - please tell.

OS
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