LM3886T board

circuit.lt · 14th November 2006, 02:13 PM

Hi,
I've made a few amps with LM3886T. They can be seen at: http://www.circuit.lt/?section=sch&page=lm3886t (sorry, only in Lithuanian, but you can still understand images

)
In photo is older revision.
They work fine for me, but few visitors have reported, that their amplifiers are humming. For others - fine too.
Why could this happen? Is there anything wrong in PCB?

Regards,
circuit

fosforo · 17th November 2006, 03:00 PM

Quote:

Originally posted by circuit.lt
Hi,
I've made a few amps with LM3886T. They can be seen at: http://www.circuit.lt/?section=sch&page=lm3886t (sorry, only in Lithuanian, but you can still understand images )
In photo is older revision.
They work fine for me, but few visitors have reported, that their amplifiers are humming. For others - fine too.
Why could this happen? Is there anything wrong in PCB?

Regards,
circuit

Could you post the revised schematics?

Nordic · 17th November 2006, 04:04 PM

Your circuit looks fine.
Humming possibly caused by power wires/transformer badly positioned in case.

Also builders should make sure the input and output jacks are isolated from the case.

braid power cables and use shielded signal cables inside the box, or twist a pair of cables tightly if you don't have shielded cable.

Keep cable between input jack and pcb as short as possible...

circuit.lt · 17th November 2006, 06:51 PM

Schematics and PCB are here:

14th November 2006, 02:13 PM	#1
circuit.lt diyAudio Member Join Date: Nov 2006	LM3886T board Hi, I've made a few amps with LM3886T. They can be seen at: http://www.circuit.lt/?section=sch&page=lm3886t (sorry, only in Lithuanian, but you can still understand images ) In photo is older revision. They work fine for me, but few visitors have reported, that their amplifiers are humming. For others - fine too. Why could this happen? Is there anything wrong in PCB? Regards, circuit

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17th November 2006, 04:04 PM	#3
Nordic diyAudio Member Join Date: Sep 2005	Your circuit looks fine. Humming possibly caused by power wires/transformer badly positioned in case. Also builders should make sure the input and output jacks are isolated from the case. braid power cables and use shielded signal cables inside the box, or twist a pair of cables tightly if you don't have shielded cable. Keep cable between input jack and pcb as short as possible...

17th November 2006, 06:51 PM	#4
circuit.lt diyAudio Member Join Date: Nov 2006	Schematics and PCB are here: