Hi all ,
Constructed a Low power Stereo amplifier out of TDA2822 (Equivalent KA2209)(scheme attached).
Every thing is Working Fine , except The amplifier is collecting Radio Frequencies for some reason , especially when the AV cable is connected .
So the output is a Remix of Songs from Radio & the Mp3 Player
Any help will be deeply appreciated .

 

Hello,

What kind of cable do you use between the MP3 and the amplifier?
It sounds like an RFI problem.

Greetings,
Bertus

 

Hello,

What kind of cable do you use between the MP3 and the amplifier?
It sounds like an RFI problem.

Greetings,
Bertus

Its the Usual Stereo Cable , 3.5mm at one end & A/V connection at the other. like the one in the pic attached.
I am using the same cable with my other power amp , but every thing is fine there (no radio Frequencies) .
So any solution to deal with this problem ?

 

Hi all,

It seems the RCA female socket i am using is Catching the radio frequency (R/F) , as i tried connecting the amplifier without using the RCA female socket , the output is crystal clear , but when i use the same , The R/F is heard .

So any suggestions to ground the radio frequency ?

 

Hello,

Is the ground ring of the RCA male connector making good contact to the female one?
It can be the ground springs needs to be pressed a tiny bit in.

Greetings,
Bertus

 

Hello,

Is the ground ring of the RCA male connector making good contact to the female one?
It can be the ground springs needs to be pressed a tiny bit in.

Greetings,
Bertus

Tried that before you Replied , But still the same problem .