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Old 23rd August 2013, 12:25 PM   #2251
BYRTT is online now BYRTT  Denmark
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Quote gannaji post 2250: Hi gannaji, after public v1.4 this thread went "Commercial sector", please respect.

kindly answer:
Your request say purpose is for education and learning hmmmm, then i say read this hole thread it is top stuff for education and learning, and when you have read hole thread you are able to compile same schematic as i have = learning. If you after have read the hole thread not are able to nearly understand circuit and compile nearly same schematic as shipped, then i claim your skills is at such level that if you got copy of mine v1.4x, you won't understand anyway = no learning.
Digging into this thread will also take you to 4 x other very hot VSSA version threads.
And remember i am hobbyist, so how true is my v1.4x.

Skeptical answer:
Truth is that v1.3 is splendeed for engineering education and learning, final version is just tuneup for real world stability and performance, what do you need this for ?
If you have hidden agenda/purpose behind request, for example build your own private high performance amp or go commercial production by your own, i suggest: Contact author to participate in group buy (for private amp), or negotiate with author about OEM possibility.
Last you could try request author for final version.

Ricky
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Old 25th August 2013, 12:22 PM   #2252
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analog_sa 3pcb set + extra output device pairs & isolators (for stereo if possible)
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Old 25th August 2013, 01:00 PM   #2253
mravlca is offline mravlca  Slovenia
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BYRTT 8 PCB set
CaféNoir 6 PCB set
ColinAlex 8 PCB set
DavorXXL 6 PCB set
DuffyDawg 4 PCB set + 4 SMPS400
electromf 4 PCB set
badrisuper 2 PCB set
volavola 2 PCB set
JethroTull 2 PCB set
kp93300 2 PCB set
momomo67890 4 pcb set
ua3grn 6pcb set
mj777 2pcb set
mkusan 2pcb set
Odysseas 4pcb (2 pairs)
hcbonfim 2pcb set
Albrerta 2pcb set
dw1narso 2 pcb set (1 stereo) + extra output device pairs & isolators (for stereo if possible)
supernet 2 pcb set
milandks 4pcb set
tjencks 2pcb set
quanghao: 2pcb set
audionootje: 4pcb set (2x stereo)
tritosine 4pcb (2 pairs)
Bobo le Chat 2 pcb set
AP2 2pcb set+2pcb empity (i need this also)
Meganinja 2 set ( stereo )
mikvous 2 pcb set
Rick G 2 PCB set
kindhornman 2 boards
ravid 2 pcb set
siberia 2 pcb set
gnat 2 pcb set
potepuh 2 pcb set
metallicus69 4 pcb set
Ranchu32 2 pcb set
woofertester 4 pcb set
edbk 4 pcb set
Raj1 2 pcb set (or 6 if available)
analog_sa 3pcb set + extra output device pairs & isolators (for stereo if possible)
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Old 25th August 2013, 01:28 PM   #2254
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Default VSSA Transistor Matching

Of the people who have built the SSA/VSSA/TSSA, who matches transistors by measuring at operating current and voltage?

I am about to start building an SSA and a VSSA. I have bought 2SA970, 2SC2240, MJE340, MJE350, etc. I have tested 10 pcs from each batch at Ic = 2mA at Vce = 40V. The input pair for VSSA has a Vce of about 40V from my calculations.

I set Vce to 40V and then adjust Ib from very small to about where Ic= 4mA and measure Beta throughout.

The MJE transistors were measured at Ic = 10 mA.

The values for Beta leave me absolutely no pairs of NPN/PNP transistors that match.

Here are the ranges for Beta

MJE340STU 91.4 - 104.8
MJE350STU 144.0 - 155.2

2SC2240-GR 279.7 - 356.9
2SA970BL - 509.4 - 632.0

KSA1381ESTU 126.5 - 134.3
KSC3503DSTU 79.0 - 80.5

I need to find some KSC3503E.

My goal is to get matched pairs. I believe that offset will be easier to control and distortion will be lower with matched pairs.

Withing a particular part number, identical matches abound.

Suggestions and comments are welcome.
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Old 25th August 2013, 03:01 PM   #2255
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2SC3502E are just as good as the ones you look for, it just have a 200 Vce limit.Other then that it`s the same device. they are available on ebay.. i got some and they tested good.
2SC3502E 2SC3502 Trans GP BJT NPN 200V 0 1A 3 PIN TO 126 | eBay

Last edited by BenY; 25th August 2013 at 03:03 PM.
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Old 25th August 2013, 08:47 PM   #2256
Cuda is offline Cuda  France
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Hello,

What must I change on the schematic if I replace the LATFET with Sanken STD03 thermaltrack darlington

Thanks

Last edited by Cuda; 25th August 2013 at 09:09 PM.
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Old 26th August 2013, 09:16 PM   #2257
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Hi cuda

No problem at all, integrated thermal tracking (sensing) diodes should become a part of a TL431 bias generator, to prevent thermal runaway ie. to compensate PTC of a darlington pair.
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Old 26th August 2013, 09:23 PM   #2258
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Old 26th August 2013, 09:35 PM   #2259
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Way to go LC. Looking forward to hearing these!
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Old 26th August 2013, 09:40 PM   #2260
Rick G is offline Rick G  United States
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Those Pic's will make a LOT of people Happy, not to mention You!
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