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LM3886 and DPDT switch
LM3886 and DPDT switch
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Old 5th July 2008, 08:54 AM   #1
Dino-Indo is offline Dino-Indo  Indonesia
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Question LM3886 and DPDT switch

Dear friends,

Would appreciate your kind help...

I was trying to add a 3.5mm Stereo RCA socket to my gainclone LM3886, providing her with 2 options of signal inputs, i.e. from my Non OS DAC and another one from iPod or MP3 player.

Was trying to apply a DPDT switch with the connection as per attached picture... strangely, only left channel sings... right channel just silent!

Am I connecting it wrong?
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File Type: gif dpdt-gainclone input selector (dino).gif (8.7 KB, 298 views)
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Old 5th July 2008, 11:51 AM   #2
Nuuk is offline Nuuk  United Kingdom
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Sounds like you have a short somewhere on the right channel. Your wiring on the switch looks OK to me.
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Old 5th July 2008, 03:41 PM   #3
e_fortier is offline e_fortier  Canada
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LM3886 and DPDT switch

Looks like a cold solder on the switch, if both source do not work check the right channel connection on the switch (middle contact) or simply bypass the switch with a alligator clip to see if the switch is the problem. Also make sure the gnd for all 4 inputs are tied together since they do not pass through the switch.

Your wiring circuit is OK.

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Old 5th July 2008, 07:18 PM   #4
jan.didden is offline jan.didden  Europe
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Possibly the 3.5mm jack is on the case metal, and you by mistake used the ground lug for one channel? It *is* a stereo-3.5mm jack, right? Three solder lugs?

Jan Didden
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Old 6th July 2008, 04:53 AM   #5
Dino-Indo is offline Dino-Indo  Indonesia
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Dear All!!
Many thanks for your kind help!!

Yep... confirmed... I did somethin' foolish.. one of the feet of the DPDT switch was connected to other feet by a tiny loose cable!!
Probably I was just too hurry to finish the 3.5mm iPod connection with my minus 3.5 eyeglasses... haiyaah!!

Lesson learnt for me: "Tidy up Dino!!"
Again.... many thanks!!
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