Planet audio tt1250 works but have a high pitch noise on the speaker - diyAudio
Go Back   Home > Forums > General Interest > Car Audio

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 17th December 2011, 12:51 AM   #1
ivkata is offline ivkata  United States
diyAudio Member
 
Join Date: Dec 2010
Default Planet audio tt1250 works but have a high pitch noise on the speaker

Ok got this amp on ebay, was sold to me as broken . the amp power on fine and dosent aper to ever been repaired . Audio is clear however there is a high pitch noise ( like jet engine noise ) that starts 1-2 seconds after the amp is powered. Noise is presented with or without rya connected ,with or without audio so i believe to be internal .this units have internal fan can the fan be the reason for the parasite noise
  Reply With Quote
Old 17th December 2011, 01:02 AM   #2
ivkata is offline ivkata  United States
diyAudio Member
 
Join Date: Dec 2010
and 1 min later no audio no noise now ,wtf

Opened the amp and tested the output rails I'm getting + - 54 volts witch i believe is more than enough . tested most of the op amps and they are fine , however IC111 appears to be getting -+ 54 volts as well and this is over the parts specs -KIA393P .will remove it from the board as defective by now and see why I'm getting that much power to it when the other one is getting +- 9

Last edited by ivkata; 17th December 2011 at 01:32 AM.
  Reply With Quote
Old 17th December 2011, 11:50 PM   #3
diyAudio Member
 
Join Date: Nov 2003
Location: Louisiana
You are not seeing 54 volts on it. It's sitting on the negative rail (pin 4 connected to the negative rail) and pin 8 is 12v above the negative rail. I think you'll find only 12v if you place the probes directly on the two power supply pins for the IC.
  Reply With Quote
Old 18th December 2011, 12:33 AM   #4
ivkata is offline ivkata  United States
diyAudio Member
 
Join Date: Dec 2010
thanks perry i saw that as well ,my issue is that i was getting 54 v on all other legs of the op amp ,so its either my multimeter going crazy or its me . i don't have any kia393p ic i do have 4558d can i swap them out
  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


Similar Threads
Thread Thread Starter Forum Replies Last Post
Help with M-Audio LX4 5.1 speaker noise thezfunk Chip Amps 1 12th September 2010 08:47 PM
High pitch tone from AlephMini yoke Pass Labs 1 15th February 2009 02:40 PM
Monica 2 + gain stage; High pitch noise problem spacemen12 Digital Line Level 0 27th October 2008 04:00 AM
FS - Planet Waves Pro-Audio speaker cables t-head Swap Meet 0 18th October 2008 09:22 PM
High Pitch Noise in tweeters bigrubes24 Car Audio 2 28th April 2005 01:39 AM


New To Site? Need Help?

All times are GMT. The time now is 10:59 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