DIY input selector with ON-OFF-ON switch question.

[sim_tcr]

Is it possible to build an INPUT selector with ON-OFF-ON toggle switch ?



The need is,
I have an amplifier which only takes one audio input (left and right).
I want to connect two inputs to it (using above switch) , So that I can either choose the first input or second input.

I am not able to figure out how the wiring would be.

 

[Kannan]

By input, I presume you are taking about low-level input i.e RCA input.
In that case do not use toggle switches, but go for a relay based system like below.

https://theaudiocrafts.com/audio-in...iffany-style-rca-iss-04?search=input selector

 

[sim_tcr]

By input, I presume you are taking about low-level input i.e RCA input.
In that case do not use toggle switches, but go for a relay based system like below.

https://theaudiocrafts.com/audio-input-selector-board-for-bulk-head-tiffany-style-rca-iss-04?search=input selector

By input I meant one being stereo input from laptop another being stereo input from rpi.
can’t it be done Simple switch?

 

[IndianEars]

Yes it can be done with the appropriate switch.

Keep in mind the following:

1. The switch you have shown is a Single Pole Double Throw (SPDT) Switch.... ie it can select any one of 2 inputs.

2. BUT.... Stereo is 2 Channels (left & right)
So you will need a Double Pole Double Throw (DPDT) Switch..... also easily available.

 

[RtoR King]

Yes it can. The relay board noted above is an enhanced solution that keeps the audio signals confined to a small area of the box versus having to run line level audio cables around inside the box. But plain switches have been used for over 80 years switching line level audio signals in millions of products and work just fine.

 

[sim_tcr]

Yes it can be done with the appropriate switch.

Keep in mind the following:

1. The switch you have shown is a Single Pole Double Throw (SPDT) Switch.... ie it can select any one of 2 inputs.

2. BUT.... Stereo is 2 Channels (left & right)
So you will need a Double Pole Double Throw (DPDT) Switch..... also easily available.

I have two of these switches, I was hoping one for left channel and another for right channel.
Are you able to please help me with a simple wiring diagram ?

 

[amrutmhatre90]

By input I meant one being stereo input from laptop another being stereo input from rpi.
can’t it be done Simple switch?

I have something I had bought sometime back.
I had Tube Pre amp, Denon and a Nad Pre amp all feeding into one power amplifier.

https://amzn.to/3gUXkoX

 

[sim_tcr]

this for left channel alone with a dpdt on-off-on switch.
is that correct?

 

[spirovious]

I have two of these switches, I was hoping one for left channel and another for right channel.
Are you able to please help me with a simple wiring diagram ?

You can use dual one like this

https://encrypted-tbn0.gstatic.com/images?q=tbn:ANd9GcRaVbDs9K7teqeTs_sToUKc3PbTezRREDcJ9g0T2oWfC2LUWwk&s

 

[sim_tcr]

You can use dual one like this

https://encrypted-tbn0.gstatic.com/images?q=tbn:ANd9GcRaVbDs9K7teqeTs_sToUKc3PbTezRREDcJ9g0T2oWfC2LUWwk&s

Yes.
Ordered https://sharvielectronics.com/product/6-pin-15a-125vac-dpdt-on-off-on-toggle-switch/

 

[IndianEars]

Are you able to please help me with a simple wiring diagram ?

Diagram Attached..... I hope its self explanatory

Simply Joint all Grounds (The Shield or "Jali" wire ) together.... ie Join / twist together the Shields from the Amplifier, RPI & Laptop

 

[sim_tcr]

Diagram Attached..... I hope its self explanatory

Simply Joint all Grounds (The Shield or "Jali" wire ) together.... ie Join / twist together the Shields from the Amplifier, RPI & Laptop

So the grounds from each signal combined need not connected to the switch at all? As if they are directly connected without switch.

 

[IndianEars]

So the grounds from each signal combined need not connected to the switch at all? As if they are directly connected without switch.

Yes.

The Grounds can all be connected Directly to each other (Bypassing the switch)

 

[Subbu68]

My DIY amp (ELekit TU8200) has a DPDT switch for two inputs. The issue is I find signal "leak" from the input 2 when there is no signal on input 1. Probably due to common ground.

 

[RtoR King]

My DIY amp (ELekit TU8200) has a DPDT switch for two inputs. The issue is I find signal "leak" from the input 2 when there is no signal on input 1. Probably due to common ground.

Or just simple crosstalk inside the switch. If you turn the volume all the way up switched to a dead input while the other has a signal playing, it's not at all uncommon to have some bleed through. But under normal listening conditions, this really isn't an issue. The music or whatever will swamp out the minuscule crosstalk.

If this is still a problem for anybody, you can make T type switch configurations that short all unused inputs. But be careful with that as there you can have crosstalk through the ground system. There is no such thing as a dead short or zero ohms resistance in the real world. Perfection is never easy or cheap and all fields of engineering are based on compromises.

 

[sim_tcr]

Tested the wiring and works well.
I need to now put this in to an enclosure.

 

[sim_tcr]

Final product.

 

[arunlouie]

I tried the same for an DIY preamp, I ended up shorting for one input. May be because of cramped space to work in that cabinet soldering went wrong.

 

[sim_tcr]

Now I have three input to select from. The current arrangement allows me to select between only two.
I have 1 pole 12 way rotary switch like this .
The rotary has 12 switch positions. It got 12 outer poles and 1 middle pole.
will I be able to use that for my need?

Or do I go with https://www.gtechaudios.com/index.php?route=product/product&product_id=82?

 

[mbhangui]

Now I have three input to select from. The current arrangement allows me to select between only two.
I have 1 pole 12 way rotary switch like this .
The rotary has 12 switch positions. It got 12 outer poles and 1 middle pole.
will I be able to use that for my need?

Or do I go with https://www.gtechaudios.com/index.php?route=product/product&product_id=82?

You need 2 pole three way.

Here is one 3 pole three way (one pole will be left unused)

Amazon.in