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Analog Line Level Preamplifiers , Passive Pre-amps, Crossovers, etc.

Analog audio switcher
Analog audio switcher
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Old 5th September 2012, 09:24 AM   #1
Pleh is offline Pleh
diyAudio Member
Join Date: Sep 2012
Default Analog audio switcher

I am building a simple analog audio switch device. Everything is working great, no noise. Here is the problem:

I have two output channels as described in the picture and one input. I also drew how I connected the phono RCA connectors and my switch.

With a DPDT toggle switch i switch between two output channels.

1.I connect a audio source in to the input of my switching device.
2.I connect an Amplifier and speakers on Output Channel 1.
3. I connect a headPreamp on Output Channel 2

So i Turn the switch so that i Hear channel 1.
I dont turn on the amp so there is no music coming out.
I put my head phones on and I hear music from channel 1, but my head phones are connected to channel 2.

I also connected all the grounds together including the aluminum casing.

So where is the problem?

do you have any ideas?

Is the problem in the DPDT switch? Or how I connect the grounds together?

RCA connectors:
PSG01510 - PRO SIGNAL - SOCKET, PHONO, GOLD/BLACK | Farnell Republika Slovenija

DPDT switch:
1MD1T1B5M1QE - MULTICOMP - SWITCH, DPDT, 5A, 250V | Farnell Republika Slovenija

Thanks in advance for your help.

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Old 5th September 2012, 11:11 AM   #2
DUG is offline DUG  Canada
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Join Date: Jan 2003
Location: mississauga ontario canada
possibly a misinterpretation of switch position:

Toggle Switches, Rocker Switches, LCD Programmable Switches, Subminiature Switches, Slide Switches, Surface Mount Switches, Programmable Switches, Pushbutton Switches, Miniature Toggle Switches, Tactile Switches

or the amplifier has a high enough impedance to pick up the signal.

or all of the grounds are not connected.

or something else I haven't thought of.

Doug We are all learning...we can all help
"You can't stop the signal, Mal. Everything goes somewhere..."
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Old 5th September 2012, 03:30 PM   #3
AuroraB is offline AuroraB  Norway
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Join Date: May 2001
Location: Norway, -north of the moral circle..
In your sketch, toggle up connects to the lower contact set.....
all normal.......
While the Lie leapt from Bagdad to Constantinopel, the Truth was still looking for it's sandals!
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