Hi guys,
I've build a speaker for my notebook using three TDA2030's. With one amp connected to the PSU the sound quality is very good, but the quality drops as I connect other two amps to the PSU.
It gets hum...noise.
Could you plaese guide me how to wire multiple TDA2030 amp boards to a single power supply?
Thank you in advance,
Stinger
I've build a speaker for my notebook using three TDA2030's. With one amp connected to the PSU the sound quality is very good, but the quality drops as I connect other two amps to the PSU.
It gets hum...noise.
Could you plaese guide me how to wire multiple TDA2030 amp boards to a single power supply?
Thank you in advance,
Stinger
Here's a digram of my wiring:
As you see each amp has two grounds. one is for signal-gnd and the other is for decoupler and bypass capacitors.
Where's the problem with my wiring?
I have another question about the diode pole;
Can they cause any problem?
As you see each amp has two grounds. one is for signal-gnd and the other is for decoupler and bypass capacitors.
Where's the problem with my wiring?
I have another question about the diode pole;
Can they cause any problem?
You didnt include signal wiring in your diagram you sent me either.
I think you have some earth loops.
When you say its not as good, what degrades?
Do you get more noise? less volume? Hum?
I think you have some earth loops.
When you say its not as good, what degrades?
Do you get more noise? less volume? Hum?
Definately sounds like earth loops.
You signal coming in will consist of two wires, earth and sig.
Disconnect the signal earth from your star mains earth, and connect it to the signal earth coming in.
Thats how i got zero hum in my amp, and i have 6 modules, with 2 different power supplies!
Also your power supply, is it regulated? What size filter caps do you have?
You signal coming in will consist of two wires, earth and sig.
Disconnect the signal earth from your star mains earth, and connect it to the signal earth coming in.
Thats how i got zero hum in my amp, and i have 6 modules, with 2 different power supplies!
Also your power supply, is it regulated? What size filter caps do you have?
Thank you very much!
Done; No Hum at all!
Ther's still a little Hiss sound at the moment; Is that normal?
Done; No Hum at all!
Ther's still a little Hiss sound at the moment; Is that normal?
Do you get the hiss with the signal line disconnected?
It could just that amp module may hiss a little bit.
One of the reasons i love LM3875 chips, sooooo little hiss its amazing.
It could just that amp module may hiss a little bit.
One of the reasons i love LM3875 chips, sooooo little hiss its amazing.
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