Analog Multiplexer for 6 Channels | SPST Switch

[Wetmelon]

Hi everyone,

I'm trying to take this circuit:

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?

 

[skeptic2]

http://focus.ti.com/lit/ds/symlink/cd54hc4051.pdf

Check out the HC4053.

 

[Wetmelon]

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:

I found the MAX4948, but I don't know anybody who has them in stock and I have no idea how to wire it
http://datasheets.maxim-ic.com/en/ds/MAX4947-MAX4948.pdf

 

[berkeman]

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?

 

[Wetmelon]

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.

 

[berkeman]

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?

 

[Wetmelon]

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?

 

[Wetmelon]

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?

 

[Perfection]

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)

 

[Wetmelon]

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.