noise problem

danyel · 22nd February 2005, 09:28 PM

I've just built a power amplifier with tda 7294 and tda 1524.
The case for the amplifier does not include the power supply . Here's my problem:the amplifier section is very quiet but when i connect the preamp section it gets noisy.Don't know how to say in english: it's a "sssssssssssssssss" noise, not very powerfull but disturbing. When i connect a cd plyer (napa 311 mp3 player-with batteries) this noisy sound gets amplified the moment i raise the volume from approx.30 % up. Just don't know how to fix this.
HELP! Anyone...

Netlist · 22nd February 2005, 09:52 PM

It could of course be the cd player. Did you try with another source?

/Hugo

Leolabs · 23rd February 2005, 07:41 AM

U might be having grounding problem

danyel · 23rd February 2005, 11:59 AM

I've connected my amp to the pc.It sounds great.The fuss is still here but it doesn't increase any more when i turn up the volume.U were right: it seems the cd-player is the problem.But with another amp this noise is not present anymore.Impedance mismatch? I will ceck the grounding too.Anyone experienced tda1524? How does it sounds?
Don't have pics with my amplifier but i'll try to post some as soon as posible. It looks great and it's small due to the lack of the power suply(this one is in another case).Kind of strange isn't it?

22nd February 2005, 09:28 PM	#1
danyel diyAudio Member Join Date: Feb 2005 Location: bucharest	noise problem I've just built a power amplifier with tda 7294 and tda 1524. The case for the amplifier does not include the power supply . Here's my problem:the amplifier section is very quiet but when i connect the preamp section it gets noisy.Don't know how to say in english: it's a "sssssssssssssssss" noise, not very powerfull but disturbing. When i connect a cd plyer (napa 311 mp3 player-with batteries) this noisy sound gets amplified the moment i raise the volume from approx.30 % up. Just don't know how to fix this. HELP! Anyone...

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22nd February 2005, 09:52 PM	#2
Netlist diyAudio Moderator Join Date: Jan 2003	It could of course be the cd player. Did you try with another source? /Hugo

23rd February 2005, 07:41 AM	#3
Leolabs diyAudio Member Join Date: Dec 2004 Location: Bukit Mertajam	U might be having grounding problem

23rd February 2005, 11:59 AM	#4
danyel diyAudio Member Join Date: Feb 2005 Location: bucharest	I've connected my amp to the pc.It sounds great.The fuss is still here but it doesn't increase any more when i turn up the volume.U were right: it seems the cd-player is the problem.But with another amp this noise is not present anymore.Impedance mismatch? I will ceck the grounding too.Anyone experienced tda1524? How does it sounds? Don't have pics with my amplifier but i'll try to post some as soon as posible. It looks great and it's small due to the lack of the power suply(this one is in another case).Kind of strange isn't it?

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