How to remove hum sound? - 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 2nd July 2003, 03:45 PM   #1
Kimhua is offline Kimhua  Singapore
diyAudio Member
 
Join Date: Jul 2003
Location: Woodlands
Send a message via ICQ to Kimhua
Default How to remove hum sound?

hi everyone out there.... I have this problem with my new build 50watt mono block power amp, whenever i switch on the power of the power amp, it give me the loud hum sound... the hum sound will gone off after i turn on the input signal source (CD Player). Just wana know how to remove the hum sound before turning on the cd-player??? Thank in advance for any helpful information.
  Reply With Quote
Old 3rd July 2003, 11:46 AM   #2
yeti is offline yeti  Germany
diyAudio Member
 
Join Date: Nov 2001
Location: Ewersbach
Default hum

You can solder resistors from hot to ground on your inputs.
I think the values should be in the range between 10K and 47K.

good luck

Arne
  Reply With Quote
Old 3rd July 2003, 01:19 PM   #3
Kimhua is offline Kimhua  Singapore
diyAudio Member
 
Join Date: Jul 2003
Location: Woodlands
Send a message via ICQ to Kimhua
Default Re: hum

Quote:
Originally posted by yeti
You can solder resistors from hot to ground on your inputs.
I think the values should be in the range between 10K and 47K.

good luck

Arne
finally sloved the problem... but the values range u gave me doesn't work for my amp... so i use a variable resistor & found out that a 2 ohm resistor value work best for me... Thank for ur idea!
  Reply With Quote
Old 3rd July 2003, 03:00 PM   #4
diyAudio Member
 
jan.didden's Avatar
 
Join Date: May 2002
Location: Great City of Turnhout, Belgium
Blog Entries: 7
Kimhua,

Do you mean 2 Ohms or 2 kilo-Ohms? How does it sound with this modification?

Jan Didden
  Reply With Quote
Old 4th July 2003, 06:52 AM   #5
hacknet is offline hacknet  Singapore
diyAudio Member
 
Join Date: Nov 2002
Location: sg
2 ohms? u are drawing more current from that resistor than the speaker is....
  Reply With Quote
Old 4th July 2003, 09:45 AM   #6
Kimhua is offline Kimhua  Singapore
diyAudio Member
 
Join Date: Jul 2003
Location: Woodlands
Send a message via ICQ to Kimhua
After added in the 2 Ohm/3w Resistor the hum sound has gone, abt the sound i think it still the same only the input signal volume has slightly lower....
  Reply With Quote
Old 4th July 2003, 09:58 AM   #7
Kimhua is offline Kimhua  Singapore
diyAudio Member
 
Join Date: Jul 2003
Location: Woodlands
Send a message via ICQ to Kimhua
Quote:
Originally posted by hacknet
2 ohms? u are drawing more current from that resistor than the speaker is....
drawing more current? abt this i not too sure coz i am only a newbie in diy audio.... but the amp itself already hot wired a 15k ohms between the input signal and the ground, so i actually added in another 2 ohms resistor in parallel....
  Reply With Quote
Old 5th July 2003, 03:56 PM   #8
hacknet is offline hacknet  Singapore
diyAudio Member
 
Join Date: Nov 2002
Location: sg
the 15k is the input resistance, by u putting a 2ohm resistor across, u are almost shorting the damn thing, u want to becareful not to short up the preamp`s output stage. i thing u should take out that 2 ohm resistor and resort to something else.

simple theory,

(R1*R2)/(R1+R2)

eg:

(15k*2)/(15k+2) = 30k/15k002
= 2 ohms

becareful.

if u have 2volts into the inputs.

V=IR

therefore

I=V/R
I=4/2
I = 2 ampere.

u are certainly overdriving the preamp.

since u are in singapore, give me a call at 62812827. lets see what we can do.

REGARDS
  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
remove saa7030 pisky Digital Source 94 30th October 2010 05:49 AM
Trying to remove RF jduffy Chip Amps 8 26th February 2007 11:36 AM
How to Remove Standoff eris Chip Amps 9 25th February 2007 03:10 PM
Remove LM3886 harsh sound soundNERD Chip Amps 32 3rd March 2006 03:41 AM


New To Site? Need Help?

All times are GMT. The time now is 04:41 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