Carlos,
L shape heat sink, might be better
if you're using a lower height ( under 8cm) case for your amplifier
if you're often changing amp parts as it's simpler to do.
however using L heat sink takes more horisontal space in your box.
and
to properly transfer the heat, the L bracket should be as thick as possible ( i don' t think using a bended 0.5 mm aluminum plate is sufficient, and imo bending more than 0.5mm aluminum plate need special tools or you got some super human strength ; -) )
I vote for pcb laying flat on to the heatsink approach, like jan leach pcb and esp p101.
Nordic latest revision board looks like that it can be use for both L bracket hs and pcb aying flat on to the hs.
L shape heat sink, might be better
if you're using a lower height ( under 8cm) case for your amplifier
if you're often changing amp parts as it's simpler to do.
however using L heat sink takes more horisontal space in your box.
and
to properly transfer the heat, the L bracket should be as thick as possible ( i don' t think using a bended 0.5 mm aluminum plate is sufficient, and imo bending more than 0.5mm aluminum plate need special tools or you got some super human strength ; -) )
I vote for pcb laying flat on to the heatsink approach, like jan leach pcb and esp p101.
Nordic latest revision board looks like that it can be use for both L bracket hs and pcb aying flat on to the hs.
Vote for flat surface computed.
I use to bend "L" shape that has 3 milimeters easy, one hand and without effort..using my automobile iron gate gap.
Thickness only creates delay to heat transference (fake efficiency into the first seconds only)... contact area is the most important thing to heat transference.
regards,
Carlos
....................................................................................................
Boys
I need this voting fast...dead line is today, we have to produce gerber files and order that stuff today or tomorrow.
Not voting on time, i will keep the last board made.
Votes are slow in speed, people not cooperating with votes..i do not know why..... 100 by one.... 100 folks reading and only one cooperating with votes.
Come on folks..help us a little!
In 24 hours i will close the voting and will count the votes...cannot wait no longer..boards must be ordered in a special long time producion, and come to brazil into Dudainc luggage.... travel bags.
Some will be sent to South Africa too.
Were are Stuey and Rabbitz?
regards,
Carlos
I use to bend "L" shape that has 3 milimeters easy, one hand and without effort..using my automobile iron gate gap.
Thickness only creates delay to heat transference (fake efficiency into the first seconds only)... contact area is the most important thing to heat transference.
regards,
Carlos
....................................................................................................
Boys
I need this voting fast...dead line is today, we have to produce gerber files and order that stuff today or tomorrow.
Not voting on time, i will keep the last board made.
Votes are slow in speed, people not cooperating with votes..i do not know why..... 100 by one.... 100 folks reading and only one cooperating with votes.
Come on folks..help us a little!
In 24 hours i will close the voting and will count the votes...cannot wait no longer..boards must be ordered in a special long time producion, and come to brazil into Dudainc luggage.... travel bags.
Some will be sent to South Africa too.
Were are Stuey and Rabbitz?
regards,
Carlos
My preference is the same way as the AKSA.... a heatsink with a ledge.
All depends how readily available they are and we have no problems in Australia as Condrad make them for suppliers here.
http://www.conradheatsinks.com/products/index.html
Rod's method of the devices under the PCB makes for a very tight layout in an amp so the power amp is not much bigger than the heatsink.... very smart but hides the output devices for those that like to look.
I do like Hugh's VBE solution with the transistor on top of the output but I know you don't like it.
I think it comes down to what heatsinks are readily available around the world.
All depends how readily available they are and we have no problems in Australia as Condrad make them for suppliers here.
http://www.conradheatsinks.com/products/index.html
Rod's method of the devices under the PCB makes for a very tight layout in an amp so the power amp is not much bigger than the heatsink.... very smart but hides the output devices for those that like to look.
I do like Hugh's VBE solution with the transistor on top of the output but I know you don't like it.
I think it comes down to what heatsinks are readily available around the world.
I might ask you later in the year to send me a set from conrad, on a boat to keep shipping down...
I have one low cost sink type available ... the type I have in HRII...
20 fins 20 x 20 x 4cm, 1cm base, flat. and I can buy it in half that size , 20x10x4, but also no lip.
Only other supplier of large sinks is RS components, very expensive although wonderful sinks, but none with the lip profile...
Someone pointed out to me yesterday that the lip is quite conveniant for mounting TO3 type cans... you just drill a big hole...
I also like the transistor on top of another one... would look neater if he alligns it nicely though... will be a lot closer thermal tracking... would be neat if their was a single component VBE multiplier... like a type of chip that includes all the parts and a trimpot...
I have one low cost sink type available ... the type I have in HRII...
20 fins 20 x 20 x 4cm, 1cm base, flat. and I can buy it in half that size , 20x10x4, but also no lip.
Only other supplier of large sinks is RS components, very expensive although wonderful sinks, but none with the lip profile...
Someone pointed out to me yesterday that the lip is quite conveniant for mounting TO3 type cans... you just drill a big hole...
I also like the transistor on top of another one... would look neater if he alligns it nicely though... will be a lot closer thermal tracking... would be neat if their was a single component VBE multiplier... like a type of chip that includes all the parts and a trimpot...
Carlos - i would like to vote against L shape aluminium - this L shape is used as adapter to mount output devices onto the heatsink.... i do not like it - i like better to mount the devices directly onto the heatsink....
but this way you will need bigger heatsink ....
still i am for NOT using L shapes..... result is a better heatsinking.... one thermal resistance less in the equation..... 🙂
hope this helps 🙂
but this way you will need bigger heatsink ....
still i am for NOT using L shapes..... result is a better heatsinking.... one thermal resistance less in the equation..... 🙂
hope this helps 🙂
yes.... this what I want... dxP I boards....stop voting.... send them to the factory...
I also want to send them to the factory, but, this is a need
Nordic no happy with my decision.... i am not happy with his decision...so..we have not agreement in our hearts.
This is a subject only that Nordic is accepting i am "da boss"..and i do not like to be in that position... i feel that unfair.
So.... to avoid bad feeling between me and Nordic, i felt better to submit this to the forum.
We have already 7 votes.
3 Votes more will decide.
We have 4 votes to YES to "L" profile, Hugh Dean and mine style
We have 3 votes do NO to "L" profile, Nordic style
Voters must check and control:
Dave Rice yes to "L" shape adaptor
Triast yes for "L" shape adaptor
Duda yes for "L" shape adaptor
Rabbitz yes for "L" shape adaptor
François said no to "L" shape adaptor
Dexter said no to "L" shape adaptor
Sparkle said no to "L" shape adaptor
the tenth vote will decide.
regards and thank you all, by cooperation
Carlos
Nordic no happy with my decision.... i am not happy with his decision...so..we have not agreement in our hearts.
This is a subject only that Nordic is accepting i am "da boss"..and i do not like to be in that position... i feel that unfair.
So.... to avoid bad feeling between me and Nordic, i felt better to submit this to the forum.
We have already 7 votes.
3 Votes more will decide.
We have 4 votes to YES to "L" profile, Hugh Dean and mine style
We have 3 votes do NO to "L" profile, Nordic style
Voters must check and control:
Dave Rice yes to "L" shape adaptor
Triast yes for "L" shape adaptor
Duda yes for "L" shape adaptor
Rabbitz yes for "L" shape adaptor
François said no to "L" shape adaptor
Dexter said no to "L" shape adaptor
Sparkle said no to "L" shape adaptor
the tenth vote will decide.
regards and thank you all, by cooperation
Carlos
wooowwwwwwwww !
what a nice surpise 😀
Audio Democracy
One Step a head Carlos
It is better if Hugh Dean or Rabbitz
can give their opinion too
It must be something happen if he want it 😀
For me I can learn from the study case
Sayonara, jeffry
what a nice surpise 😀
Audio Democracy
One Step a head Carlos
It is better if Hugh Dean or Rabbitz
can give their opinion too
It must be something happen if he want it 😀
For me I can learn from the study case
Sayonara, jeffry
http://www.dagogo.com/images/AccuphaseE550InsideFront.jpg
http://avplaza.co.kr/shop/lib/editor/up_image/1095073620.jpg
http://www.hometheaterhifi.com/volume_13_3/images/mark-levinson-436-amplifier-inside-chassis.jpg
http://home.broadpark.no/~sjlarsen/hifi/nemo_inside.jpg
http://www.nightmarepatrol.net/martin/ht/data/krell_ksa300s.jpg
those are the 5 random names i pick up .....all of them DO NOT use L profile - probably because of the high disipation of their units and compact size.... when mounting the pcb onto the heatsink the size is more compact of every module but there is a problem of NOT BEING ABLE TO ACCESS TO THE SOLDER SIDE if there is a need to solder or change anything - so guys - when voting please keep this also in mind....accesibility..... 🙂
hope this helps a bit....
http://avplaza.co.kr/shop/lib/editor/up_image/1095073620.jpg
http://www.hometheaterhifi.com/volume_13_3/images/mark-levinson-436-amplifier-inside-chassis.jpg
http://home.broadpark.no/~sjlarsen/hifi/nemo_inside.jpg
http://www.nightmarepatrol.net/martin/ht/data/krell_ksa300s.jpg
those are the 5 random names i pick up .....all of them DO NOT use L profile - probably because of the high disipation of their units and compact size.... when mounting the pcb onto the heatsink the size is more compact of every module but there is a problem of NOT BEING ABLE TO ACCESS TO THE SOLDER SIDE if there is a need to solder or change anything - so guys - when voting please keep this also in mind....accesibility..... 🙂
hope this helps a bit....
I don't really have a preference. In mechanical engineering terms, the lack of screws etc. with the shelf is probably more elegant, so I guess that narrowly gets my vote.
FYI, the same sized heatsink in 300mm length, shelved and non-shelved, only has a .02C/W difference in specification (the shelved one being slightly less efficient). I guess it's simply because the transistor is mounted directly to the main thermal mass in the vertical type.
But don't listen to me - you guys do what you think is best! No need to vote.
I'd buy the necessary sink anyway if I build one. They are very readily available here.
Cheers
Stuey
FYI, the same sized heatsink in 300mm length, shelved and non-shelved, only has a .02C/W difference in specification (the shelved one being slightly less efficient). I guess it's simply because the transistor is mounted directly to the main thermal mass in the vertical type.
But don't listen to me - you guys do what you think is best! No need to vote.
I'd buy the necessary sink anyway if I build one. They are very readily available here.
Cheers
Stuey
Hi guys, I got some quotes from the factory for producing a small scale group buy...
The boards are quite a bit larger than the HRII, which is why there is a diffirence in the price...
For a run of 20 boards I can do it at $15 each ($30 per set).
Please give a hands up if you are interested...
The boards are quite a bit larger than the HRII, which is why there is a diffirence in the price...
For a run of 20 boards I can do it at $15 each ($30 per set).
Please give a hands up if you are interested...
Please folks, vote to finish this subject
Your kind cooperation is beeing asked.
Will be better not to create bad feeling between Nordic and me...if he win i will not complain him...as forum decided.
If my idea win, he will not complain me, as forum decided.
So, folks, to keep the "marriage" alive, help us...VOTE!
acessibility is very important as Sparkle said...board over heatsink turns more difficult to repair, to replace and to try ideas..have to dismount all the holder the board have into the heatsink and also to dismount the transistors..it is a huge work to repair or to tweak...i think this, by itself i enougth to decide.
VOTE!..... DX CORPORATION WANTS YOUR VOTE!
regards,
Carlos
Your kind cooperation is beeing asked.
Will be better not to create bad feeling between Nordic and me...if he win i will not complain him...as forum decided.
If my idea win, he will not complain me, as forum decided.
So, folks, to keep the "marriage" alive, help us...VOTE!
acessibility is very important as Sparkle said...board over heatsink turns more difficult to repair, to replace and to try ideas..have to dismount all the holder the board have into the heatsink and also to dismount the transistors..it is a huge work to repair or to tweak...i think this, by itself i enougth to decide.
VOTE!..... DX CORPORATION WANTS YOUR VOTE!
regards,
Carlos
right Carlos - there are numerous things that we have to consider ...... when deciding ... 🙂
so VOTE guys - today is the LAST DAY....... help CARLOS and Nordic decide what is best -
****************************************
AT LEAST YOU CAN DO THAT - FOR ALL THE EFFORT THEY MADE TO produce the boards and this project and make it public.....preety please 🙂
****************************************
.....
so VOTE guys - today is the LAST DAY....... help CARLOS and Nordic decide what is best -
****************************************
AT LEAST YOU CAN DO THAT - FOR ALL THE EFFORT THEY MADE TO produce the boards and this project and make it public.....preety please 🙂
****************************************
.....
One vote...
One vote from me for the "L" shape adaptor. Seems more ergonomic to me. I prefer Carlos's way...
One vote from me for the "L" shape adaptor. Seems more ergonomic to me. I prefer Carlos's way...
Msankl, thank you to vote.
Very helpfull.
Now we have five votes for "L" shape adaptor and 3 votes for the other purposal.
You see..ahhahaha...other...that thing...the other..ahahahah!
Now, we can have still 5 to 5 points..so... we need one more vote to decide.
regards,
Carlos
Very helpfull.
Now we have five votes for "L" shape adaptor and 3 votes for the other purposal.
You see..ahhahaha...other...that thing...the other..ahahahah!
Now, we can have still 5 to 5 points..so... we need one more vote to decide.
regards,
Carlos
Nordic is preparing smaller boards to brazilian market
Will be to the Dx Standard, the Vanilla, the Classic.
Will have VBE multiplier on board, so people can put transistors alike Hugh use to put (I hate that)...three wires will go out from the board to the VBE multiplier transistor that will go external to the board.... preference to solder wire under the board and transistor hidden, not to make too much mess...well this is up to you.
Will be sold brazilian Market...will be ordered in Washington - USA...and Nico will have some boards.
Will be sold with profit in brasil and from South Africa too.
Board is not looking the way i like..cannot use "L" adaptor..but was made this way to reduce size..our decision, in such a thing we agree 100 percent...brazil folks are not paid in dollar...minimum payment is 180 dollares..so..boards can be sold by a very small price..because if not will not be sold.
Price will have agreement with Nordic...same price in Africa and Brazil.
Regards,
Carlos
Will be to the Dx Standard, the Vanilla, the Classic.
Will have VBE multiplier on board, so people can put transistors alike Hugh use to put (I hate that)...three wires will go out from the board to the VBE multiplier transistor that will go external to the board.... preference to solder wire under the board and transistor hidden, not to make too much mess...well this is up to you.
Will be sold brazilian Market...will be ordered in Washington - USA...and Nico will have some boards.
Will be sold with profit in brasil and from South Africa too.
Board is not looking the way i like..cannot use "L" adaptor..but was made this way to reduce size..our decision, in such a thing we agree 100 percent...brazil folks are not paid in dollar...minimum payment is 180 dollares..so..boards can be sold by a very small price..because if not will not be sold.
Price will have agreement with Nordic...same price in Africa and Brazil.
Regards,
Carlos
Dx Vanilla, Dx amplifier, Dx Classic is into Version 3
Nico will finish today, and we gonna order tomorrow.
Boards colour and silk screen letters will be decided by Dudainc in the United States.
My suggestion is ligth coffee with milk colour for the board, and letters dark brown.
But Duda may prefer dark red..near violet colour...or maybe yellow..he wants something more marketable.
The colour shown is not the one.... Nico Daneel (Nordic) will show the official, final boards, the one will be ordered soon
regards,
Carlos
Nico will finish today, and we gonna order tomorrow.
Boards colour and silk screen letters will be decided by Dudainc in the United States.
My suggestion is ligth coffee with milk colour for the board, and letters dark brown.
But Duda may prefer dark red..near violet colour...or maybe yellow..he wants something more marketable.
The colour shown is not the one.... Nico Daneel (Nordic) will show the official, final boards, the one will be ordered soon
regards,
Carlos
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