Go Back   Home > Forums > >
Home Forums Rules Articles diyAudio Store Blogs Gallery Wiki Register Donations FAQ Calendar Search Today's Posts Mark Forums Read

Solid State Talk all about solid state amplification.

Destroyer x Amplifier...Dx amp...my amplifier
Destroyer x Amplifier...Dx amp...my amplifier
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 24th November 2011, 11:38 AM   #6931
harmonicconverger is offline harmonicconverger  Philippines
diyAudio Member
 
Join Date: Nov 2011
Location: Philippines
i have a problem. all circuits are fitted right. no grounded traces. all components are working. but when i turned it on, with protective resistor, these are the following problems.

1. protective resistors get hot after a minute or two.
2. my power transistor gets hot too.
3. output measures some DC. around 3volts

i don't hook up any load yet and the input is grounded as the procedure says.
Attached Images
File Type: jpg DSC04558.JPG (195.9 KB, 351 views)
File Type: jpg DSC04559.JPG (200.7 KB, 326 views)
  Reply With Quote
Old 24th November 2011, 12:03 PM   #6932
AndrewT is offline AndrewT  Scotland
diyAudio Member
 
Join Date: Jul 2004
Location: Scottish Borders
Power up via a bulb tester.
It will stop the devices becoming hot.
It will allow you to measure voltages without risk of the amp blowing up.
It will not prevent a slipped probe from blowing up the amplifier. The smoothing caps discharge through the accidental short and the magic smoke dissipates.
__________________
regards Andrew T.
  Reply With Quote
Old 24th November 2011, 12:51 PM   #6933
harmonicconverger is offline harmonicconverger  Philippines
diyAudio Member
 
Join Date: Nov 2011
Location: Philippines
and one more thing. only A1943 is getting warmer but c5200 is cold. what is the problem? i check the voltage across the protective resistor and it reads 4.40v.
  Reply With Quote
Old 24th November 2011, 02:44 PM   #6934
harmonicconverger is offline harmonicconverger  Philippines
diyAudio Member
 
Join Date: Nov 2011
Location: Philippines
tight bass. pronounce mids and highs. DX amp is now working.
  Reply With Quote
Old 24th November 2011, 03:20 PM   #6935
blistard is offline blistard  Netherlands
diyAudio Member
 
Join Date: Jul 2010
Location: the hague
Quote:
Originally Posted by harmonicconverger View Post
tight bass. pronounce mids and highs. DX amp is now working.
What was the problem, and is it solved?
  Reply With Quote
Old 24th November 2011, 04:00 PM   #6936
harmonicconverger is offline harmonicconverger  Philippines
diyAudio Member
 
Join Date: Nov 2011
Location: Philippines
actually. it is now working. but it seems there are still problems like:

1.when i set my DMM to 200m and measure the output i have dc readings from hundreds then fluctuating slowly.

2. when i test the resistor protection i got my reading at 500+MV but when it is in the halfway, it reads 1400+MV.

now i don't know what to do.
  Reply With Quote
Old 24th November 2011, 06:23 PM   #6937
destroyer X is offline destroyer X  Brazil
diyAudio Member
 
destroyer X's Avatar
 
Join Date: Feb 2004
Location: Recife - Brasil Northeast
Default There's a trimpot to adjust off set.

Is it assembled below (beneath) your pcboard.. is it in the copper side?

Is this trimpot adjusting?... when you turn the trimpot knob or the adjustment screw, is the off set changing?

Mistakes.... this is what you have... do not desperate..go searching because this is normal to happens..... **** happens as you know...yeah...i have typed this symbol (*) was not forum automatic correction.

Everybody makes mistakes.... even the one says that does not make mistake is doing a mistake..and his mistake is to say this foolish that cannot make mistakes...we are humans...we fail... search for your mistake dear Harmonic.

By the way..is the bias trimpot operating?

How is the sonics?...if not astounding and awesome..then you have mistakes..... everybody loves that sonics.

regards,

Carlos
Attached Images
File Type: png Dx Amplifier.png (137.9 KB, 296 views)
File Type: jpg Dx Amplifier off set adjustment trimpot.jpg (205.0 KB, 283 views)
File Type: jpg Trimpot.jpg (159.8 KB, 256 views)
__________________
Dx unbeatable amplifiers; https://www.youtube.com/watch?v=u4tGBiqMnzQ

Last edited by destroyer X; 24th November 2011 at 06:32 PM.
  Reply With Quote
Old 25th November 2011, 02:05 AM   #6938
harmonicconverger is offline harmonicconverger  Philippines
diyAudio Member
 
Join Date: Nov 2011
Location: Philippines
here is my reading in output terminal.
Attached Images
File Type: jpg DSC04563.JPG (195.4 KB, 104 views)
  Reply With Quote
Old 25th November 2011, 12:53 PM   #6939
destroyer X is offline destroyer X  Brazil
diyAudio Member
 
destroyer X's Avatar
 
Join Date: Feb 2004
Location: Recife - Brasil Northeast
Default Is this current scale or other scale?

Off set is Direct current... milivolts in DC...what is your measurement... the flash spot is covering the scale so i cannot know what scale you are using.

regards,

Carlos
__________________
Dx unbeatable amplifiers; https://www.youtube.com/watch?v=u4tGBiqMnzQ
  Reply With Quote
Old 25th November 2011, 02:17 PM   #6940
harmonicconverger is offline harmonicconverger  Philippines
diyAudio Member
 
Join Date: Nov 2011
Location: Philippines
it was set to 200mV. and the reading was 4.7mV
  Reply With Quote

Reply


Destroyer x Amplifier...Dx amp...my amplifierHide 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

Forum Jump


New To Site? Need Help?

All times are GMT. The time now is 11:53 PM.


Search Engine Optimisation provided by DragonByte SEO (Pro) - vBulletin Mods & Addons Copyright © 2017 DragonByte Technologies Ltd.
Resources saved on this page: MySQL 15.79%
vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2017 DragonByte Technologies Ltd.
Copyright ©1999-2017 diyAudio
Wiki