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Old 23rd July 2007, 09:47 AM   #11
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Default thanks andrew t

no thats not right ...the resistor of 750 R is part of the drive .... true i noticed also strange topology on this schematic ....

out is on the left side just right after the out coil

please let us know what do you thing about that ......


thanks gaetan for the bridge to bridge and bridge from bridge and bridge plus bridge schematic i am just truing to make a joke ..... may be possible that this produces some 200w but i dont like it from topology not the kind of thing i like to do .....

but thanks though
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Old 23rd July 2007, 01:19 PM   #12
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Default i will be ...

be building very soon this with tda and aditional bd 911-12 just to listen to and remember how this thing is playing be fore constructing the lm 12 thing .....

my pcb is ready to go to the print house then will see ... i think ive done a very odd job

will mount everything on heatsink .....
then solder the pcb directly to transistors (using it upside down ) and then solder the rest of components like smd .....

here is a view ...
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Old 23rd July 2007, 01:30 PM   #13
AndrewT is offline AndrewT  Scotland
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Can I see charcoal on the horizon?
Should I duck now or wait for the bang?
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Old 23rd July 2007, 01:38 PM   #14
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Only one pair of TO-220 helper transistors? What voltage will you be using, and what load?
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Old 23rd July 2007, 01:52 PM   #15
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Default guys ......

give me a brake ...... this original schematic from national

what do i do ????? ignore the book?????

it doesnt say that you design that with 10 pairs of transistors

then whats the point on having it to the book ???? as what??? as sugestion ???

dont get it ......

still eager to construct will see

thanks though for the interest ....andrew t i thing you have a very nice sense of humor ..... it is not easy to write this post cause i am laughing my brains out..... thanks though .....i will construct nomatter ....and post my results

thank you people
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Old 23rd July 2007, 02:00 PM   #16
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Default to richie boy

Post #14
Only one pair of TO-220 helper transistors? What voltage will you be using, and what load?

the two 220 transistors are only the drivers of mj 802 and mj4502 that boosting the lm 12

as about the rail voltage .... the book says 100 beatyfull volts .....the book from my view there is not much else to say

give me a few days and i will let you know

if andrew t is right will post my labs postal adress so all of you can send me fire extinguisers for birthday resent can use them also in some other amplifiers that failed to construct .....

people who follow my post know very well what i am talking about
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Old 23rd July 2007, 02:53 PM   #17
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That original app note shows what appears to be a single pair of output transistors and 90V rails driving 10 amp loads. Even though I'm seeing it I can't believe it.
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Old 23rd July 2007, 02:57 PM   #18
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Default will find out ...

pcb is on the way..... just a few days and we will find out ......

i got a hinch from my guts that this will operate like his small brother tda 2030 boosted with bd 911-12 i.e will have power of some 150-200w on the bench but have dynamics of almost the double .....or more

i like diy audio glossary destroyer x have big love for sonics i have crazy love for dynamics !!!!!
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Old 23rd July 2007, 03:39 PM   #19
mzzj is offline mzzj  Finland
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Quote:
Originally posted by richie00boy
That original app note shows what appears to be a single pair of output transistors and 90V rails driving 10 amp loads. Even though I'm seeing it I can't believe it.

Orginal app note says: " with proper thermal desing" (read: "-273 Celsius, or plenty of liquid nitrogen")

1pair of output transistors can probably handle thermal dissipation with music signals. Problem is still that output devices SOA is smoky...narrow.
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Old 23rd July 2007, 03:46 PM   #20
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Default ok

all these you say i take very serious but still its in the book !!!!!

thermal mangement DO not mean adding of 10 pairs of transistors .... but proper and equall cooling of the all set ...i think also my theory is crap so i just think.....

will see as i said lets give it a few days

funny thing so many people constructed so many things but none so far messed up with a thing like that
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