How to remove hum sound?

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Kimhua

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Joined 2003
#1
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. 🙂
 
#3
Re: hum

yeti said:
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
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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! 🙂
 
#7
hacknet said:
2 ohms? u are drawing more current from that resistor than the speaker is....
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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....
 
#8
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
 
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