Re: Remember to tweak the rail regulators
Carlos,
Thanks for your very helpful reminder.
If I use the transformer mentioned above with 120VAC input I should end up with 40VDC at idle, if it runs according to specs. So I will replace only the rail regulator zener references
But I also plan to build a HRIII later - for that I will connect our 120VAC power to the 100VAC input on this 1KVA transformer. We actually get 125VAC from the wall plug, so I should end with about 50 VDC. I will have to figure out how many power transistor pairs I need then, and do all the tweaks you mentioned, or just use your HRIII schematic, and Nordic's new board (?) for it.
Thanks for initiating all this fun!
Francois
To Nordic:
Jammer man - die ding weeg te veel vir Vader Kerfees se trip na RSA
Carlos,
Thanks for your very helpful reminder.
If I use the transformer mentioned above with 120VAC input I should end up with 40VDC at idle, if it runs according to specs. So I will replace only the rail regulator zener references
But I also plan to build a HRIII later - for that I will connect our 120VAC power to the 100VAC input on this 1KVA transformer. We actually get 125VAC from the wall plug, so I should end with about 50 VDC. I will have to figure out how many power transistor pairs I need then, and do all the tweaks you mentioned, or just use your HRIII schematic, and Nordic's new board (?) for it.
Thanks for initiating all this fun!
Francois
To Nordic:
Jammer man - die ding weeg te veel vir Vader Kerfees se trip na RSA
Hello folks!... in special for Nordic, i have tested the HRII with the MP3 player
I perceived sounded better with i install a load to the player..the 33 ohms resistance .... one to each channel.
Also my player had noises when playing into very low levels...the capacitor killed the noises.
Observe the gain resistance, 220 ohms because of the player low output level.
regards,
Carlos
I perceived sounded better with i install a load to the player..the 33 ohms resistance .... one to each channel.
Also my player had noises when playing into very low levels...the capacitor killed the noises.
Observe the gain resistance, 220 ohms because of the player low output level.
regards,
Carlos
Attachments
Hi Nordic
I hope you are finding energy to deal with the stuff you are going through - I am sure other people here have you and your family in their thoughts and prayers.
Like everyone else, I am chomping at the bit to have my crack at the DX HR-II. How is yours after a few hours of listening? Also, how is the higher power version coming along?
Did you have a chance to ship my stuff (and Carlos' too)? I am pretty sure Carlos is getting his mind busy with other things, but cannot wait until his boards (and goodies) show up.
Cheers!
I hope you are finding energy to deal with the stuff you are going through - I am sure other people here have you and your family in their thoughts and prayers.
Like everyone else, I am chomping at the bit to have my crack at the DX HR-II. How is yours after a few hours of listening? Also, how is the higher power version coming along?
Did you have a chance to ship my stuff (and Carlos' too)? I am pretty sure Carlos is getting his mind busy with other things, but cannot wait until his boards (and goodies) show up.
Cheers!
Honnestly, i don't know, but I think so, I have a bag with the last few envelopes inside that I have to take to the post office a little later this evening, also have some others that shipped allready that I had not had the chance to send off tracking numbers for yet. Will try to finish that all off tonight some time so that I have the weight off my shoulders... it was a very big project...
Still have some boards left (not many) so I'll have to have some made again, for your future orders... also made extra resistor booklets and transitor bags to speed up future orders...
Also with that order will be speaker protection modules...
PLEASE USE 2A fuse in series with the speaker during tests at least... (for 8 ohm loads) (for 4 ohms use a 3 or 4A)
Still have some boards left (not many) so I'll have to have some made again, for your future orders... also made extra resistor booklets and transitor bags to speed up future orders...
Also with that order will be speaker protection modules...
PLEASE USE 2A fuse in series with the speaker during tests at least... (for 8 ohm loads) (for 4 ohms use a 3 or 4A)
Please!.... use fuses.... PLEASE!
I will be happy to know our boards are travelling Duda.... this is the first time i am sure i will receive something from outside Brasil.
I have already made that question to Nordic..he is very busy those last days...also a little disturbed because his mum is sick.
here is the text i have prepared, because people will start to construct.
I wish you the best folks!
.......................................................................................................
I am asking you, folks, not to forget to install fuses
into your amplifiers.... install into the rails and also
into the output, as rail fuse burning will produce big
off set into the output.
Nordic, once, had problems, those things happens,
and happened with a tested amplifier...had operated
for hours and he faced problems... i do not know
exactly the component that burns.... maybe accident
because of humidity near the circuit...not sure yet.
But, even not because off accidents, we know damn
things happens.
Because of that, i have tried, and once again...maybe
the third time i did that, to burn the amplifier:
I have connected, using wet fingers, the output to
the input, to force oscilations and radio frequency
pick up...had not problems.
I have increase the sensitivity, the gain resistance
was dropped to 100 ohms...even this way, no problems
I remove the input RF capacitor, the feedback line cap
too, the Miller capacitor was reduced to 10pf, all stop
resistances removed, all rail 100n capacitors removed,
the regulator capacitor and condenser removed, the rail
condensers removed (the capacitor, into rail left side
was keept...without it, really, is a crime!)... i have
removed the bootstrapp...you see... two resistances
and nothing into the mid way, to the ground, this uses
to produce oscilations, low frequency oscilations and
noises...and nothing happened.
Not satisfied i have changed the input transistors to
600 gain units.... the units were for 200 Megahertz...and
no problem there too.
I have tried 200 Megahertz transistors as drivers, also
i tried the “perfect oscilator”, the 2SC2240, the unit is
nice for sonics but loves deeply to oscilate... all rigth!
The second VAS i tried a switching transistors...well
the unit oscilated (YES).... i have to install capacitors
from base to colector (220pf) to stop the unit...so....
this can kill the amplifier.
I have used long wires, mess made into the board...even
VAS used long wires (and cannot do that!).
I have injected square wave..... 3 volts peak to peak, 100
Hertz and 20000 Hertz... saturating he input...nothing
happened....nothing has burned, also the fuses survive.
I have constructed a spider passive crossover (assassine!)
and nothing happened.
I have used high capacitive cable to speaker... coaxial...with
small distance from the shield to the inner conductor...fine!
I have not submerged into the watter....not waterproof...also
not protected against Radio Frequency if your aerial is near
the amplifier....my cell phone (900 Megahertz i think) enters
and saturates de amplifier when send tones to the remote
antennas around, one antenna is 150 feet distant from my
home....yes...entered!...but this normally enters if your amp
is not shielded using metal can over it... and even doing that,
if you keep holes bigger than 2 milimeters diameter the radio
signal enters.
I have removed my condensers into the supply to see if the
amplifier could burn...had noises, of course..but survived.
Boys, folks, friends, bud...i made all i could to offer you
a reliable unit...tested, checked, constructed many times...
and made that to be entirelly sure that you will succeed.
So...be sure, if something did not worked fine... check the
unit till you find inverted parts, errors into resistance values,
errors into condensers, defective condensers or capacitors,
inverted transistors, damaged transistors, supply wire
inverted..shorts caused by solder under the board (always
clean with a hard brush after soldering, and inspect with
lenses)..... check if speaker cables if shorted, openned or
speaker driver defective.
I wish the best for you all...i hope you like and enjoy the
amplifier...my pleasure is your satisfaction.
- Rail resistances during first adjustments and fuses when ready
to go!
Carlos
I will be happy to know our boards are travelling Duda.... this is the first time i am sure i will receive something from outside Brasil.
I have already made that question to Nordic..he is very busy those last days...also a little disturbed because his mum is sick.
here is the text i have prepared, because people will start to construct.
I wish you the best folks!
.......................................................................................................
I am asking you, folks, not to forget to install fuses
into your amplifiers.... install into the rails and also
into the output, as rail fuse burning will produce big
off set into the output.
Nordic, once, had problems, those things happens,
and happened with a tested amplifier...had operated
for hours and he faced problems... i do not know
exactly the component that burns.... maybe accident
because of humidity near the circuit...not sure yet.
But, even not because off accidents, we know damn
things happens.
Because of that, i have tried, and once again...maybe
the third time i did that, to burn the amplifier:
I have connected, using wet fingers, the output to
the input, to force oscilations and radio frequency
pick up...had not problems.
I have increase the sensitivity, the gain resistance
was dropped to 100 ohms...even this way, no problems
I remove the input RF capacitor, the feedback line cap
too, the Miller capacitor was reduced to 10pf, all stop
resistances removed, all rail 100n capacitors removed,
the regulator capacitor and condenser removed, the rail
condensers removed (the capacitor, into rail left side
was keept...without it, really, is a crime!)... i have
removed the bootstrapp...you see... two resistances
and nothing into the mid way, to the ground, this uses
to produce oscilations, low frequency oscilations and
noises...and nothing happened.
Not satisfied i have changed the input transistors to
600 gain units.... the units were for 200 Megahertz...and
no problem there too.
I have tried 200 Megahertz transistors as drivers, also
i tried the “perfect oscilator”, the 2SC2240, the unit is
nice for sonics but loves deeply to oscilate... all rigth!
The second VAS i tried a switching transistors...well
the unit oscilated (YES).... i have to install capacitors
from base to colector (220pf) to stop the unit...so....
this can kill the amplifier.
I have used long wires, mess made into the board...even
VAS used long wires (and cannot do that!).
I have injected square wave..... 3 volts peak to peak, 100
Hertz and 20000 Hertz... saturating he input...nothing
happened....nothing has burned, also the fuses survive.
I have constructed a spider passive crossover (assassine!)
and nothing happened.
I have used high capacitive cable to speaker... coaxial...with
small distance from the shield to the inner conductor...fine!
I have not submerged into the watter....not waterproof...also
not protected against Radio Frequency if your aerial is near
the amplifier....my cell phone (900 Megahertz i think) enters
and saturates de amplifier when send tones to the remote
antennas around, one antenna is 150 feet distant from my
home....yes...entered!...but this normally enters if your amp
is not shielded using metal can over it... and even doing that,
if you keep holes bigger than 2 milimeters diameter the radio
signal enters.
I have removed my condensers into the supply to see if the
amplifier could burn...had noises, of course..but survived.
Boys, folks, friends, bud...i made all i could to offer you
a reliable unit...tested, checked, constructed many times...
and made that to be entirelly sure that you will succeed.
So...be sure, if something did not worked fine... check the
unit till you find inverted parts, errors into resistance values,
errors into condensers, defective condensers or capacitors,
inverted transistors, damaged transistors, supply wire
inverted..shorts caused by solder under the board (always
clean with a hard brush after soldering, and inspect with
lenses)..... check if speaker cables if shorted, openned or
speaker driver defective.
I wish the best for you all...i hope you like and enjoy the
amplifier...my pleasure is your satisfaction.
- Rail resistances during first adjustments and fuses when ready
to go!
Carlos
I am happy if you are happy...
Everyone please post here when you get your stuff, for my peace of mind....
Also it would be nice if you can log into your accounts on the shopping cart and leave a review once you are done building..
I just want to confirm that all orders received has been shipped...
Please keep the orders comming, it is going to be a very shakey December month, so please keep the orders comming...
It would make a big diffirence.
Been haveing a few issues with the catalog's mailing system, but if you did not receive a tracking no. by mail, just log into your account... the details should be displayed there...
The tracking isn't realy good for anything... maybe for local parcels... but at least it shows you things are moveing along....
Sadly it is that time of year when mail moves slowly... walked past the post office to go get some envelopes yesterday... and their parcells was stacked all the way from the room where its normaly kept to right behind the cashiers at the counter almost a meter high... glad I'm not them....
As for Ed's group there has been a customs delay... but I can see from TNT's tracking that the stuff is on its way as of 9 o' clock Monday evening... so, Ed, it should pitch up tommorrow or the day after.
Everyone please post here when you get your stuff, for my peace of mind....
Also it would be nice if you can log into your accounts on the shopping cart and leave a review once you are done building..
I just want to confirm that all orders received has been shipped...
Please keep the orders comming, it is going to be a very shakey December month, so please keep the orders comming...
It would make a big diffirence.
Been haveing a few issues with the catalog's mailing system, but if you did not receive a tracking no. by mail, just log into your account... the details should be displayed there...
The tracking isn't realy good for anything... maybe for local parcels... but at least it shows you things are moveing along....
Sadly it is that time of year when mail moves slowly... walked past the post office to go get some envelopes yesterday... and their parcells was stacked all the way from the room where its normaly kept to right behind the cashiers at the counter almost a meter high... glad I'm not them....
As for Ed's group there has been a customs delay... but I can see from TNT's tracking that the stuff is on its way as of 9 o' clock Monday evening... so, Ed, it should pitch up tommorrow or the day after.
Hi Jack,
Recieved the parcel today
Hi Nordic,
Wow,very nice looking;You put in a great deal of work.What a package.I'm hooping to build the amp soon.I've to wait a while because I had an operation on my right hand and I'm out for 2 or 3 months.Now I've the the time to do some homework regarding the amp details etc.
Patrick
Recieved the parcel today
Hi Nordic,
Wow,very nice looking;You put in a great deal of work.What a package.I'm hooping to build the amp soon.I've to wait a while because I had an operation on my right hand and I'm out for 2 or 3 months.Now I've the the time to do some homework regarding the amp details etc.
Patrick
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