Greetings to all Readers,
First of all thank you for reading this post.
I have recently built a Stereo Power amplifier, Both L & R channels uses independent amp boards, independent power supplies (transformers) are used for each channel amp boards, best quality and shielded cables are used, But unfortunately there is a humming sound in the speakers connected to this amp and i hope there is a simple solution for the same.
Description of the problem:-
- No Audio (RCA) inputs connected = No humming at all (FINE)
- If LEFT Audio Input (RCA) connected but RIGHT (RCA) Not connected= NO HUMMING and crystal clear (music) sound from the left channel speaker. (FINE)
- If RIGHT Audio Input (RCA) connected but LEFT (RCA) Not connected= NO HUMMING and crystal clear (music) sound from the right channel speaker. (FINE)
- Now this is when the problem occurs, when Both (R & L RCA) inputs are connected = Humming sound from both the channel speakers. (PROBLEM)
Note: During humming if either one of the RCA L or R input is disconnected, then the humming sound simply stops in both the speakers.
I tried using a different preamp, Mp3 and CD players, but the problem is the same as mentioned above.
I'll deeply appreciate any help, comments and advises, Thank you.
Best Regards.
First of all thank you for reading this post.
I have recently built a Stereo Power amplifier, Both L & R channels uses independent amp boards, independent power supplies (transformers) are used for each channel amp boards, best quality and shielded cables are used, But unfortunately there is a humming sound in the speakers connected to this amp and i hope there is a simple solution for the same.
Description of the problem:-
- No Audio (RCA) inputs connected = No humming at all (FINE)
- If LEFT Audio Input (RCA) connected but RIGHT (RCA) Not connected= NO HUMMING and crystal clear (music) sound from the left channel speaker. (FINE)
- If RIGHT Audio Input (RCA) connected but LEFT (RCA) Not connected= NO HUMMING and crystal clear (music) sound from the right channel speaker. (FINE)
- Now this is when the problem occurs, when Both (R & L RCA) inputs are connected = Humming sound from both the channel speakers. (PROBLEM)
Note: During humming if either one of the RCA L or R input is disconnected, then the humming sound simply stops in both the speakers.
I tried using a different preamp, Mp3 and CD players, but the problem is the same as mentioned above.
I'll deeply appreciate any help, comments and advises, Thank you.
Best Regards.
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