Analog Multiplexer for 6 Channels | SPST Switch

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Discussion Overview

The discussion revolves around the use of an analog multiplexer for switching between multiple audio channels in a sound system. Participants explore various components and configurations to achieve simultaneous channel switching for a 6-channel audio setup connected to both a PC and a PS3.

Discussion Character

  • Exploratory
  • Technical explanation
  • Debate/contested

Main Points Raised

  • One participant suggests using a MAX4051 multiplexer but questions its suitability for switching 6 channels simultaneously.
  • Another participant recommends the HC4053 component, implying it may be more appropriate for the task.
  • There is confusion regarding the functionality of multiplexers and demultiplexers, with participants clarifying the need for either a 1:6 demultiplexer or a 6:1 multiplexer.
  • A participant describes their specific use case involving a 6-channel sound system and the desire to switch between audio sources from a PC and a PS3.
  • Relays are proposed as an alternative to analog switches, with a participant noting they may provide higher audio quality.
  • Another participant suggests using 3 DPDT relays controlled by a simple SPST toggle switch as a potential solution.
  • A suggestion is made to use a 6PDT switch as a straightforward solution for the switching requirement.

Areas of Agreement / Disagreement

Participants express differing opinions on the best approach to achieve the desired audio switching functionality. There is no consensus on whether to use multiplexers, relays, or a 6PDT switch, indicating multiple competing views remain.

Contextual Notes

Participants discuss the limitations of various components and configurations without resolving the technical details or confirming the best solution for the audio switching problem.

Who May Find This Useful

Individuals interested in audio engineering, circuit design, or those looking to implement switching solutions in multi-channel audio systems may find this discussion relevant.

Wetmelon
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Hi everyone,

I'm trying to take this circuit:

attachment.php?attachmentid=24963&stc=1&d=1270687004.png


and use an analog multiplexer to do the switching for me instead of the large, heavy, awkward, and expensive DPDT switches. Someone suggested a MAX4051 but I don't see how that could work, as I believe it is 8 to 1?

I want to switch all 6 channels at the same time with one SPST switch. Is a multiplexer appropriate for this, or should I be looking at something else?
 

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I'm not sure I understand it. This allows me to input 6 channels and choose three of those to output simultaneously, correct? I have to output to 6 channels simultaneously.

This is a more simplified version of the same circuit:
SimpleAudioInterface.png


I found the MAX4948, but I don't know anybody who has them in stock and I have no idea how to wire it O.o
http://datasheets.maxim-ic.com/en/ds/MAX4947-MAX4948.pdf
 
Wetmelon said:
I want to switch all 6 channels at the same time with one SPST switch. Is a multiplexer appropriate for this, or should I be looking at something else?

A SPST switch switches one input signal between two possible output channels (DEMUX), or two input channels into one output channel (MUX). So it's not applicable to a 6-channel system.

Do you want a 1:6 DEMUX or a 6:1 MUX function? Or do you just want to be able to drive 6 output channels simultaneously based on 1 input channel?
 
berkeman said:
A SPST switch switches one input signal between two possible output channels (DEMUX), or two input channels into one output channel (MUX). So it's not applicable to a 6-channel system.

I was inferring that I want to be able to switch the box with a single switch that drives a circuit (i.e. a toggle switch), not run the signals through the switch itself. Sorry for the ambiguity.

Do you want a 1:6 DEMUX or a 6:1 MUX function? Or do you just want to be able to drive 6 output channels simultaneously based on 1 input channel?
Hmm. How do I explain? I can explain my real-world problem:

I have a 6 channel sound system connected to my PC that I want to share with my 2 channel PS3.

Hence, I am running 6 channels from my PC to the box.

I am running 2 channels from the PS3 DEMUXed to 6 channels (3 for left, 3 for right)

I am running 6 channels from the box to the amplifier.I want to be able to switch between my PC and the PS3.

6 in from PC

"6" in from PS3

6 out to amplifier.
 
Wetmelon said:
I was inferring that I want to be able to switch the box with a single switch that drives a circuit (i.e. a toggle switch), not run the signals through the switch itself. Sorry for the ambiguity.




Hmm. How do I explain? I can explain my real-world problem:

I have a 6 channel sound system connected to my PC that I want to share with my 2 channel PS3.

Hence, I am running 6 channels from my PC to the box.

I am running 2 channels from the PS3 DEMUXed to 6 channels (3 for left, 3 for right)

I am running 6 channels from the box to the amplifier.


I want to be able to switch between my PC and the PS3.

6 in from PC

"6" in from PS3

6 out to amplifier.

Just to clarify, there are 6 speakers, right? Those are the end customers of either 6 input audio channels, or 2 input audio channels? Relays would have higher audio quality compared to analog switches. Would you be okay using relays instead, controlled by one SPDT switch?
 
berkeman said:
Just to clarify, there are 6 speakers, right? Those are the end customers of either 6 input audio channels, or 2 input audio channels? Relays would have higher audio quality compared to analog switches. Would you be okay using relays instead, controlled by one SPDT switch?

6 speakers - 5.1 surround sound system. You've got the idea.

Yes, I would be OK with that. And relays don't have to worry as much about negative voltage, do they?
 
Are you thinking I should put 3 DPDT relays in parallel instead of 3 DPDT switches and control the voltage with a simple on-off SPST toggle switch?
 
why not just get a 6PDT?

http://search.digikey.com/scripts/DkSearch/dksus.dll?Detail&name=401-1194-ND

$2.50, and you're done! (well you need a 50 cent cap on it and a project box)
 
  • #10
Perfection said:
why not just get a 6PDT?

http://search.digikey.com/scripts/DkSearch/dksus.dll?Detail&name=401-1194-ND

$2.50, and you're done! (well you need a 50 cent cap on it and a project box)


Ha! I'd given up looking for them... "Hex SPDT" only found tiny ICs and nobody ever mentioned one :P

Thank you, I'll just get one one of those.
 

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