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

DC AUDIO D9
DC AUDIO D9
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 28th November 2017, 05:57 AM   #11
Perry Babin is offline Perry Babin  United States
diyAudio Member
 
Join Date: Nov 2003
Location: Louisiana
Have you connected a 10k resistor from pin 1 to pin 2 of the TL072 to see if the TL072 produces clean audio?
  Reply With Quote
Old 29th November 2017, 03:55 AM   #12
megael9 is offline megael9
diyAudio Member
 
Join Date: Oct 2009
DC AUDIO D9
No, there's no signal with the 10k resistor in place, but again I lost signal at driver board input pin.
All regulators -15; +15; -5 and + 5 are all ok.
Pin 1, 7, and 8 of IC 102 have signal, but there's no signal coming out of pin 14, so
I replaced IC102 (TL074) and no good result. Any idea?
__________________
fluke 50 mhz scope,35 amp power supply,0.5-12v adj power supply, fluke 179,hot air desolder gun, merit multyfuntion signal tracer/generator.
  Reply With Quote
Old 30th November 2017, 05:11 AM   #13
megael9 is offline megael9
diyAudio Member
 
Join Date: Oct 2009
DC AUDIO D9
Without the rectifier there's no signal at the driver input pin, but with the rectifiers solder in
There is signal going into the driver board and signal on all 4 low sides out of the driver board. ls this normal for this amp?
Also I tried to force the high side signal out using 12 volts between pin 11 and 13, but could not get the high signal to come out.
__________________
fluke 50 mhz scope,35 amp power supply,0.5-12v adj power supply, fluke 179,hot air desolder gun, merit multyfuntion signal tracer/generator.
  Reply With Quote
Old 30th November 2017, 06:22 AM   #14
Perry Babin is offline Perry Babin  United States
diyAudio Member
 
Join Date: Nov 2003
Location: Louisiana
How far did the signal go when the rectifiers were out?
  Reply With Quote
Old 30th November 2017, 05:10 PM   #15
megael9 is offline megael9
diyAudio Member
 
Join Date: Oct 2009
DC AUDIO D9
I couldn't trace it back to far, but with the rectifier out, the signal doesn't make it to the driver boar input pin.
The signal goes as fallow.
IC 101, pin 1 and pin 7 good signal same amplitude , pin 8 good signal some amplitude, pin pin 14 good signal some more amplitude.
IC202 pin 1 or 7 no signal.
IC203 signal is coming out at pin 1 with clipping at the button, and pin 7 with clipping at the top.
IC102 pin 1, 7 and 8 good signal same amplitude. Pin 8 no signal.
IC103 pin 1, 7 and 8 good signal same amplitude, pin 8 good signal some amplitude.
__________________
fluke 50 mhz scope,35 amp power supply,0.5-12v adj power supply, fluke 179,hot air desolder gun, merit multyfuntion signal tracer/generator.
  Reply With Quote
Old 1st December 2017, 05:48 AM   #16
megael9 is offline megael9
diyAudio Member
 
Join Date: Oct 2009
DC AUDIO D9
Does DC audio sell schematic for their amps?
__________________
fluke 50 mhz scope,35 amp power supply,0.5-12v adj power supply, fluke 179,hot air desolder gun, merit multyfuntion signal tracer/generator.
  Reply With Quote
Old 1st December 2017, 07:29 AM   #17
Perry Babin is offline Perry Babin  United States
diyAudio Member
 
Join Date: Nov 2003
Location: Louisiana
There is a resistor feeding the signal from an op-amp to the driver board. Did you lose signal on the side of the resistor that was not connected to the driver board?
  Reply With Quote
Old 1st December 2017, 02:43 PM   #18
megael9 is offline megael9
diyAudio Member
 
Join Date: Oct 2009
DC AUDIO D9
There's no signal at neither side of that resistor.
__________________
fluke 50 mhz scope,35 amp power supply,0.5-12v adj power supply, fluke 179,hot air desolder gun, merit multyfuntion signal tracer/generator.
  Reply With Quote
Old 4th December 2017, 01:48 AM   #19
megael9 is offline megael9
diyAudio Member
 
Join Date: Oct 2009
DC AUDIO D9
A customer brought me another identical model amp with a bad power supply, so a repaired the power supply and tested the amp. After it was tested and working, I took the rectifiers out and test the signal at the driver board input, and to my surprise, there was no signal.
I Don't know why, but this amp can not be tested without rectifier in the circuit.
I'd put back together the original amp that was giving me problems, and it was working perfectly.
In the past, I tested very similar amps without the rectifier soldered in and got good result, but not these D9.
Does anybody knows why this amp can not be test it without the rectifier in the circuit? Thank you for all the help.
__________________
fluke 50 mhz scope,35 amp power supply,0.5-12v adj power supply, fluke 179,hot air desolder gun, merit multyfuntion signal tracer/generator.
  Reply With Quote
Old 4th December 2017, 05:53 AM   #20
Perry Babin is offline Perry Babin  United States
diyAudio Member
 
Join Date: Nov 2003
Location: Louisiana
I can't see any reason if you have all supply voltages except rails with the rectifiers out.
  Reply With Quote

Reply


DC AUDIO D9Hide 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

Similar Threads
Thread Thread Starter Forum Replies Last Post
Multi player for pc to play multiple audio files via digigram audio card TJSentech PC Based 1 24th October 2017 05:30 AM
New Freeware PC VST Audio Plugin: Ixahe Audio - MyLim Ixahe PC Based 13 19th July 2016 12:07 AM
JL Audio 300/4 Low Audio Output Troubleshooting Tip kds9591 Car Audio 3 25th December 2012 02:09 PM
Good books or videos on audio production, audio engineering, or audio editing tunks14 Everything Else 0 15th April 2011 11:00 PM
For Sale Or Trade: Adire Audio Brahma, Rythmik Audio Plate Amp tmort Swap Meet 5 27th June 2009 01:29 AM


New To Site? Need Help?

All times are GMT. The time now is 09:16 PM.


Search Engine Optimisation provided by DragonByte SEO (Pro) - vBulletin Mods & Addons Copyright © 2018 DragonByte Technologies Ltd.
Resources saved on this page: MySQL 15.00%
vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2018 DragonByte Technologies Ltd.
Copyright ©1999-2018 diyAudio
Wiki