LM3886 and DPDT switch

Dino-Indo · 5th July 2008, 08:54 AM

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?

Nuuk · 5th July 2008, 11:51 AM

Sounds like you have a short somewhere on the right channel. Your wiring on the switch looks OK to me.

e_fortier · 5th July 2008, 03:41 PM

Hi,

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.

Eric

janneman · 5th July 2008, 07:18 PM

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

Dino-Indo · 6th July 2008, 04:53 AM

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!!"

Hahahaha................
Again.... many thanks!!

5th July 2008, 11:51 AM	#2
Nuuk diyAudio Member Join Date: Feb 2003 Location: Somerset, SW England	Sounds like you have a short somewhere on the right channel. Your wiring on the switch looks OK to me. __________________ The truth need not be veiled, for it veils itself from the eyes of the ignorant.

5th July 2008, 07:18 PM	#4
janneman diyAudio Member Join Date: May 2002 Location: Where Germany, The Netherlands and Belgium meet Blog Entries: 6	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 __________________ /Another new issue: Linear Audio Volume 3!

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5th July 2008, 03:41 PM	#3
e_fortier diyAudio Member Join Date: May 2001 Location: Montreal	Hi, 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. Eric

6th July 2008, 04:53 AM	#5
Dino-Indo diyAudio Member Join Date: Jan 2007	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!!" Hahahaha................ Again.... many thanks!!

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