Dear Dexter, welcome to the Dx crew.
This circuit, the protection, is not decided to be included into the board, maybe will be into separate board as provided now a days to the HRII.
www.dxamp.com will provide you the needed informations.
Boards are beeing "coocked" into Nordic Laboratories, and soon will be released, will be made, and sold into Nordic group buy.
I have not informs about how the circuit works, i think detect off set and switch off the unit, have insertion delay and power off delay too and will operate into high current surge switching the speaker off...well..it is Nordic circuit, he can inform those features.
regards,
Carlos
This circuit, the protection, is not decided to be included into the board, maybe will be into separate board as provided now a days to the HRII.
www.dxamp.com will provide you the needed informations.
Boards are beeing "coocked" into Nordic Laboratories, and soon will be released, will be made, and sold into Nordic group buy.
I have not informs about how the circuit works, i think detect off set and switch off the unit, have insertion delay and power off delay too and will operate into high current surge switching the speaker off...well..it is Nordic circuit, he can inform those features.
regards,
Carlos
Basicaly it is like Carlos described... the detection sits on the output... waits for all DC to be cleared or lower than the value determined by protection resistors, only then will it activate the relay to let the signal out of the amp...
I am again busy with a reworking of the PCB, as there was too much disagreement over small things...
Hopefully it is a little better from that viewpoint afterwards.
Will hold on till it is further developed, to avoid people gettting the wrong ideas...
At the moment it looks like you will need a sink about 10cm tall if you want to mount the boards over them.... that is if I can loose another 4 mm.
I am again busy with a reworking of the PCB, as there was too much disagreement over small things...
Hopefully it is a little better from that viewpoint afterwards.
Will hold on till it is further developed, to avoid people gettting the wrong ideas...
At the moment it looks like you will need a sink about 10cm tall if you want to mount the boards over them.... that is if I can loose another 4 mm.
The Dx Precision I (One) schematic is the one TAJ made for us
He produced a nice schematic using his skills and good software.
Nordic will include, into the board, the protection...other features are under discussion into the Corporation...maybe only protection and switchable VAS protection will be included into the board.
Precision II may have other features than that.
regards,
Carlos
He produced a nice schematic using his skills and good software.
Nordic will include, into the board, the protection...other features are under discussion into the Corporation...maybe only protection and switchable VAS protection will be included into the board.
Precision II may have other features than that.
regards,
Carlos
Yes...no resistance, no coil.... direct coupling to speaker.
Was supressed....not an accident.... decision we made.
Sorry if not informed sooner.
You may call me an idiot not to have informed you that...in special you that is producing boards.
I have to agree ...i was an idiot dear nephew...i am sorry.
regards,
Carlos
Was supressed....not an accident.... decision we made.
Sorry if not informed sooner.
You may call me an idiot not to have informed you that...in special you that is producing boards.
I have to agree ...i was an idiot dear nephew...i am sorry.
regards,
Carlos
Your amplifier do not need an output coil if it has a lot of phase margin or low OLG.
Maybe a very small coil, 0.5uH in parallel with 1ohm, is not a very bad idea, but only if your speaker cables are highly capacitive
Maybe a very small coil, 0.5uH in parallel with 1ohm, is not a very bad idea, but only if your speaker cables are highly capacitive
Yes Mihai...thank you very much.
i have prepared the "Speakiller"..... an instrument, not a speaker... it has 1.6 ohms impedance...speakers are in counter phase, opposite..to complicate things, not push pull, not spherical speaker aproach...also i have zeners, power zeners limiting and producing 0.5 ohms shorts into the output, both rails shorting..also i am using coils with ferrite inside...to saturate, low power capacity ferrite.... some milihenries...also have capacitance enougth.
The Speakiller is made for testing purposes.... the amplifier will be tested receiving square waves into input, overdriven, much more than needed, not only subsonic, but also high frequencies will be used...a sweep generator will send sinal to the power amplifier.
It will be tested (was already, but not so hard this way) to be reliable.
Precision II will be able to hold almost all difficult loads people can attach to it.
Precision I (One)...if to four ohms loads (also 8 ohms of course) and nothing more than that....but the other will be made to resist to huge testings.
VAS protection will have switch to put it into the work or not...also the output will have a switch...output will be connected to the NFB, so, generating EMF back to the amplifier and will have the option to be opened, not connected to the NFB, also the mirror, the CCS i am using to feed energy to the VAS and VBE multiplier will have a switch too.... the amplifier will have the condition to operate with CCS and with Bootstrapp.
This will finish with doubts...the one that will have the unit will have a laboratory to test...
What is really better...a CCS or a bootstrapp?
The user will know for sure...also the dinamic disturbance that protectors creates into the VAS...the user will know for sure...also the EMF.
So...we gonna offer the best amplifier we could make, that will eat thousands of others, and a laboratory of experimentation of audio, hahahahahaha...included and for free. (the laboratory is for free, the board will be not...ahahahahah)
No one are offering so good ideas...and if someone copy...i will offer more things.... and faster than the competition will flip their eyes.
There's another 150 watts woofer into the back panel, they are 4 ohms each one.
regards,
Carlos
i have prepared the "Speakiller"..... an instrument, not a speaker... it has 1.6 ohms impedance...speakers are in counter phase, opposite..to complicate things, not push pull, not spherical speaker aproach...also i have zeners, power zeners limiting and producing 0.5 ohms shorts into the output, both rails shorting..also i am using coils with ferrite inside...to saturate, low power capacity ferrite.... some milihenries...also have capacitance enougth.
The Speakiller is made for testing purposes.... the amplifier will be tested receiving square waves into input, overdriven, much more than needed, not only subsonic, but also high frequencies will be used...a sweep generator will send sinal to the power amplifier.
It will be tested (was already, but not so hard this way) to be reliable.
Precision II will be able to hold almost all difficult loads people can attach to it.
Precision I (One)...if to four ohms loads (also 8 ohms of course) and nothing more than that....but the other will be made to resist to huge testings.
VAS protection will have switch to put it into the work or not...also the output will have a switch...output will be connected to the NFB, so, generating EMF back to the amplifier and will have the option to be opened, not connected to the NFB, also the mirror, the CCS i am using to feed energy to the VAS and VBE multiplier will have a switch too.... the amplifier will have the condition to operate with CCS and with Bootstrapp.
This will finish with doubts...the one that will have the unit will have a laboratory to test...
What is really better...a CCS or a bootstrapp?
The user will know for sure...also the dinamic disturbance that protectors creates into the VAS...the user will know for sure...also the EMF.
So...we gonna offer the best amplifier we could make, that will eat thousands of others, and a laboratory of experimentation of audio, hahahahahaha...included and for free. (the laboratory is for free, the board will be not...ahahahahah)
No one are offering so good ideas...and if someone copy...i will offer more things.... and faster than the competition will flip their eyes.
There's another 150 watts woofer into the back panel, they are 4 ohms each one.
regards,
Carlos
Attachments
Re: Transistors are 2N5401, 2N5551 into the differential
What kind of Sanken do you mean?
Any BOM realeased?
destroyer X said:
What kind of Sanken do you mean?
Any BOM realeased?
I see...
Poor nephew.... i did the same.... lost patience and started to put pressure over him
I said:
Do it, do it, do it and do it fast, asap, to yesterday delivery!
He is working hard, 10 hours a day.
The reality is that i cannot wait too.
Also, he is very carefull, will order a sample, will mail it to Brasil, will wait me produce board testings and them will start some group buy.
He is rigth to do this way... but it is really creating me some stress
ahahahaha... i think i am fanatic too.
regards,
Carlos
I said:
Do it, do it, do it and do it fast, asap, to yesterday delivery!
He is working hard, 10 hours a day.
The reality is that i cannot wait too.
Also, he is very carefull, will order a sample, will mail it to Brasil, will wait me produce board testings and them will start some group buy.
He is rigth to do this way... but it is really creating me some stress
ahahahaha... i think i am fanatic too.
regards,
Carlos
Attachments
Yes, I'm sorry, but things need to be done carefully when you work with other people's money (groupbuys), circuits needs rechecking, and boards need prototypeing, as it saves money on haveing work redone at the factory... a big problem when there is no profits to recover such losses from.
Board is very good now a days.... you had to move the drivers
To reduce the board length.... was a good decision, as size results in more costs to the board.
Congratulation dear nephew Nico.
Great Job!
regards,
Carlos
To reduce the board length.... was a good decision, as size results in more costs to the board.
Congratulation dear nephew Nico.
Great Job!
regards,
Carlos
Neto e falantes da lingua Portuguesa.
to Neto and other portuguese speaking personnel.
I am posting into a Brazilian forum, the HTforum, the Dx amplifiers are there, with schematics and pictures and explanations about how they work.
Here the link:
http://www.htforum.com/vb/showthread.php?p=937280#post937280
Dx Amplifier will have boards made in USA and will be sold into the Brazilian Market... the standard, vanilla, Classic one.
Also i will be visiting another forum:
www.diyaudio.com.br
Now a days i have only to test the Precision II and will spend some time into the brazilian foruns.... Nico will take care of group buy into this forum, and my visits here will be a little bit reduced as people do not need me here now.
regards,
Carlos
to Neto and other portuguese speaking personnel.
I am posting into a Brazilian forum, the HTforum, the Dx amplifiers are there, with schematics and pictures and explanations about how they work.
Here the link:
http://www.htforum.com/vb/showthread.php?p=937280#post937280
Dx Amplifier will have boards made in USA and will be sold into the Brazilian Market... the standard, vanilla, Classic one.
Also i will be visiting another forum:
www.diyaudio.com.br
Now a days i have only to test the Precision II and will spend some time into the brazilian foruns.... Nico will take care of group buy into this forum, and my visits here will be a little bit reduced as people do not need me here now.
regards,
Carlos
Attachments
Triast..sorry the delay...i am very busy those days
here my prefered output transistors.
Others sound good...this one beats the ones i could test.
regards,
Carlos
here my prefered output transistors.
Others sound good...this one beats the ones i could test.
regards,
Carlos
Those will be too big for the PCB uncle charly, I think thy are only viable with boards with transistors on two sides... or you need to use some short wires to connect the transistors offboard.
36.5 x 6 = 22cm 🙁
36.5 x 6 = 22cm 🙁
They are not to be used with your boards dear nephew
Only to inform him the ones i like....
Our boards are the ones you are producing..near to be ready.
Will use the transistor you have placed there..no modification anymore..when ready to go.... order to produce prototype.
Those beautifull ones are too much big, and also there are many fakes.
I am afraid, Jacco Vermeullen have bougth all stock of those ones.
ahahahahaha!
regards,
Carlos
Only to inform him the ones i like....
Our boards are the ones you are producing..near to be ready.
Will use the transistor you have placed there..no modification anymore..when ready to go.... order to produce prototype.
Those beautifull ones are too much big, and also there are many fakes.
I am afraid, Jacco Vermeullen have bougth all stock of those ones.
ahahahahaha!
regards,
Carlos
A PC board question
Hello Nico,
The layout looks very nice.
One question though, why have the output transistors entirely on top of the board? (I.e. board below the transistor bodies) Seems like unused board space. This will also require an angle bracket to mount on a heatsink, or am I missing something?
Francois
Hello Nico,
The layout looks very nice.
One question though, why have the output transistors entirely on top of the board? (I.e. board below the transistor bodies) Seems like unused board space. This will also require an angle bracket to mount on a heatsink, or am I missing something?
Francois
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