Destroyer x Amplifier...Dx amp...my amplifier - Page 652 - diyAudio
Go Back   Home > Forums > Amplifiers > Solid State

Solid State Talk all about solid state amplification.

Please consider donating to help us continue to serve you.

Ads on/off / Custom Title / More PMs / More album space / Advanced printing & mass image saving
Reply
 
Thread Tools Search this Thread
Old 13th November 2009, 01:55 PM   #6511
diyAudio Member
 
Masterinvi's Avatar
 
Join Date: Jul 2009
hi uncle carlos, i construct another dx amp because i sold the first one i make. one of our customer needs an amp and i let him hear the sounds of dx amp and he likes it very much. So i construct another one but as i test it everything is ok, the sonic is excellent except that the speaker will move out and in during powering up the amplifier. i havent notice this thing in my first dxamp.
i try to measure the voltage in the speaker output(without speaker) as i switch on the amplifier, my voltmeter measures 8 volts and then back to zero. maybe thats why the speaker moves out and in.
Is this normal? because everything seems to be great.
Thanks
  Reply With Quote
Old 13th November 2009, 04:05 PM   #6512
diyAudio Member
 
destroyer X's Avatar
 
Join Date: Feb 2004
Location: Recife - Brasil Northeast
Default Hello Masterinvi...... this happens because of capacitors and condensers charge time

This is not normal....so, check all you condensers and reduce the value if you have increased values too much.... check if you have condenser inverted in polarity also.

This happens, usually in the long tail... sometimes people use 100uF in the place of 100n, and this means 1000 times different value.

Condensers, or capacitors takes time to charge...while charging, the voltage into those condenser extremes goes variating...under charge they go increasing, and this causes the speaker movement effect while the circuit has its voltage changing.

Include the one i am showing you.... 0.0022uf.... this means a small capacitor of 2200 picofarads.

If you have increased C3 and C6 to 4700uf you may have that too.... reduce your values to the value you have into the schematic attached.

be happy,

Enjoy Dx Amplifier

Carlos
Attached Images
File Type: jpg Check capacitors.jpg (167.4 KB, 367 views)
__________________
Power supply; ripple, filter, noise, stability and the use of capacitance multiplier... Portuguese and English; https://www.youtube.com/watch?v=sSm0ku1eIgg

Last edited by destroyer X; 13th November 2009 at 04:08 PM.
  Reply With Quote
Old 15th November 2009, 10:14 AM   #6513
diyAudio Member
 
destroyer X's Avatar
 
Join Date: Feb 2004
Location: Recife - Brasil Northeast
Default Build a Dx Amplifier... a guarantee of satisfaction!

Enjoy, it is simple, it is for free, it is easy to build, easy to adjust and will provide you years of enjoyment.

Made in a very nice place, down South America, adjusted with care for excelence of sonics, dedicated to your pleasure.

It is a real Do it yourself amplifier, nothing for sale, no boards, no parts, no costs for you, for free...you may spent money in parts and to produce boards, and this is all.

regards,

Carlos

YouTube - Build Dx Amplifier


Click the image to open in full size.
__________________
Power supply; ripple, filter, noise, stability and the use of capacitance multiplier... Portuguese and English; https://www.youtube.com/watch?v=sSm0ku1eIgg

Last edited by destroyer X; 15th November 2009 at 10:24 AM.
  Reply With Quote
Old 15th November 2009, 08:28 PM   #6514
diyAudio Member
 
Rudi_Ratlos's Avatar
 
Join Date: Jun 2009
Location: Hamburg / Germany
I am currently listening to "my DXAMP" (I do not know how to post a picture in here - maybe Carlos will post a picture I sent him):

"My DXAMP rocks" .

Beautifully, it has the sound and nature I love!
Smooth, natural, warm, with a kicking bass and no harshness at the heights, big and deep stage: this is how an AMP should sound in my ears.

Thank you very much, Carlos - Rudi_Ratlos
  Reply With Quote
Old 15th November 2009, 08:32 PM   #6515
diyAudio Member
 
destroyer X's Avatar
 
Join Date: Feb 2004
Location: Recife - Brasil Northeast
Default You are welcome Rudi...i will post pictures but will not publish your review about

the Dx Amplifiers playing and comparison with this "other" amplifier you used.

I cannot copy and paste it here...against forum rules to post emails from other sources different than ourselves.

Thank you very much....nice to listen you have appreciated a lot.

regards,

Carlos
Attached Images
File Type: jpg 1.jpg (89.3 KB, 259 views)
File Type: jpg securedownload2.jpg (59.0 KB, 249 views)
File Type: jpg securedownload3.jpg (46.7 KB, 243 views)
__________________
Power supply; ripple, filter, noise, stability and the use of capacitance multiplier... Portuguese and English; https://www.youtube.com/watch?v=sSm0ku1eIgg
  Reply With Quote
Old 15th November 2009, 08:35 PM   #6516
diyAudio Member
 
destroyer X's Avatar
 
Join Date: Feb 2004
Location: Recife - Brasil Northeast
Default They have found 1 Megahertz oscilation superimposed into the positive cicle

I think a capacitor was missed..the 2N2 capacitor is there to take care of the long tail..it is in between the off set trimpot and the 4K7 long tail resistance.

Maybe was that the trouble..but what matter is that sounded fine, no harshing , no troubles.

Easy to adjust and worked first moment.

regards,

Carlos
Attached Images
File Type: jpg securedownload4.jpg (74.7 KB, 118 views)
File Type: jpg securedownload5.jpg (56.1 KB, 102 views)
File Type: jpg 6.jpg (37.1 KB, 97 views)
__________________
Power supply; ripple, filter, noise, stability and the use of capacitance multiplier... Portuguese and English; https://www.youtube.com/watch?v=sSm0ku1eIgg
  Reply With Quote
Old 15th November 2009, 08:45 PM   #6517
diyAudio Member
 
destroyer X's Avatar
 
Join Date: Feb 2004
Location: Recife - Brasil Northeast
Default Sorry folks, the 2N2 capacitor was included along the thread...while the thread was

into the first monthes...was no included into Greg pages.

here you have were to install the capacitor..i hope it will help.

regards,

Carlos
Attached Images
File Type: jpg Sorry, modification not included.jpg (927.1 KB, 142 views)
__________________
Power supply; ripple, filter, noise, stability and the use of capacitance multiplier... Portuguese and English; https://www.youtube.com/watch?v=sSm0ku1eIgg
  Reply With Quote
Old 16th November 2009, 09:05 AM   #6518
diyAudio Member
 
Masterinvi's Avatar
 
Join Date: Jul 2009
uncle carlos i've tried reducing the values of all capacitors and install the 1 capacitor you told but still same, speaker will move out and in at start up. im just wondering because the amp still playing from morning till 6 in the afternoon, nothing wrong i've notice exept the charming music she gives. the output transistors is not that hot, you can touch it for a long time, i believe even if ill let it play for 1 month it will not gonna blow.
By the way, from my music source i feed it first to my bass and treble control through potentiometer. it means my potentiometer is not in the input of dxamp but in the input of bass and treable. I try shorting the input of dxamp to the ground and power on the amplfiier, No moving of speaker i've seen. But if i remove the short and turn off the potentiometer of my bass and treable ,speaker will move in and out.
Anyway, even if its like this i will not consider this as problem as long as this amp plays like a beautiful lady and can play all day and night long.
Thanks for this amp uncle carlos. your the man!!!
  Reply With Quote
Old 16th November 2009, 10:13 AM   #6519
AndrewT is offline AndrewT  Scotland
diyAudio Member
 
Join Date: Jul 2004
Location: Scottish Borders
Quote:
Originally Posted by Masterinvi View Post
I try shorting the input of dxamp to the ground and power on the amplfiier, No moving of speaker i've seen. But if i remove the short and turn off the potentiometer of my bass and treable ,speaker will move in and out.
shorting the input and no DC surges at the output.
Minimum volume control and DC surges at the output.
The DC surge is from the preamp/volume control.
__________________
regards Andrew T.
  Reply With Quote
Old 16th November 2009, 10:28 AM   #6520
diyAudio Member
 
destroyer X's Avatar
 
Join Date: Feb 2004
Location: Recife - Brasil Northeast
Default Thank you masterinvi.... good news..... usually they do not move

or move slow, in a subsonic way we do not even listen the movement as sound..there's no pops or other sound effects.

Observe your input condenser..if you're using an electrolitic one...the positive side goes to the first transistor base...check this polarity.

regards and continue to be happy.

The Dx amplifier will provide you many decades (decadas, period of 10 years long) of enjoyment....and i will not be surprised if watching your family, from the heaven (the place i will be, for sure) using it ... your sons and grandsons will use the amplifier in the future. IF they continue to use such kind of brain stimulation using air pressure waves..or audio.

Maybe scientists will put aerials under our skin... a receiver powered by blood pH (acid or basic) and inserting signal directing into the brain audio input...or into ear sensitive cells.... maybe audio will come from geo-stationary satelites...but if an amplifier was needed..the normal and conventional audio oscilator (another name to audio amplifiers, as they oscilate following the input signal) for sure one Dx Amplifier will be still working.

You can put it to operate full power, into 8 ohms, from here to the ethernity...maybe your transformer will blow...or the speakers..but not the amplifier..the unit is super reliable..tested those last 40 years, the schematic was used by all amplifier factories..all brands...inspired into Aksa, where you have a great audio designer...it is a good unit...guaranteed for 100 years long if you do not put water inside, not produce short circuit (long therm) into the output, not to expose (long time) under sun ligth, if you do not submerge it into a swiming pool or let if operate under rain..if you do not put it inside infrared or microwave oven, not to ask a truck to go over , or a Sherman war Tank ro something very heavy, not to cover obstructing the convection cooling...well.... having good use... decent use... stable mains voltage..then will be working for 100 years long.

regards,

Carlos
Attached Images
File Type: jpg Dx Amplifier, a reliable unit.jpg (73.1 KB, 122 views)
File Type: jpg Detail.jpg (117.1 KB, 99 views)
__________________
Power supply; ripple, filter, noise, stability and the use of capacitance multiplier... Portuguese and English; https://www.youtube.com/watch?v=sSm0ku1eIgg

Last edited by destroyer X; 16th November 2009 at 10:43 AM.
  Reply With Quote

Reply


Hide this!Advertise here!
Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off



New To Site? Need Help?

All times are GMT. The time now is 04:06 AM.


vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2014 DragonByte Technologies Ltd.
Copyright 1999-2014 diyAudio

Content Relevant URLs by vBSEO 3.3.2