Bottlehead Forum

Bottlehead Kits => Mainline => Topic started by: JamieMcC on September 11, 2015, 11:14:22 AM

Title: Mainline input selector
Post by: JamieMcC on September 11, 2015, 11:14:22 AM

I have been trying to do some AB testing between sources using the Mainlines input selector and while one channel switches over reasonably ok the other channel makes a annoying pop during the switch. So firstly should it be ok to switch between sources with the selector like this and secondly is there some kind of modification or different switch perhaps that would allow for a smother transition whilst switching from one live input to another on the fly so to speak?

Thanks

Title: Re: Mainline input selector
Post by: Paul Birkeland on September 11, 2015, 12:20:58 PM

This switch shouldn't exhibit any significant noise.  Did it melt at all when you soldered to it?  Do both your sources have 3 wire power cords?

On the Mainline I have next to me, there's just a slight sizzle when I switch inputs.

-PB

Title: Re: Mainline input selector
Post by: JamieMcC on September 11, 2015, 12:44:33 PM

Quote from: Caucasian Blackplate on September 11, 2015, 12:20:58 PM

This switch shouldn't exhibit any significant noise.  Did it melt at all when you soldered to it?  Do both your sources have 3 wire power cords?

On the Mainline I have next to me, there's just a slight sizzle when I switch inputs.

-PB

Hi Paul ok one source only has a two wire power chord.

Title: Re: Mainline input selector
Post by: Paul Birkeland on September 11, 2015, 01:49:37 PM

You could try grounding the chassis of that component to earth or to the plate of the Mainline (or converting to 2-wire cord to a 3-wire cord).

Title: Re: Mainline input selector
Post by: JamieMcC on September 11, 2015, 09:13:26 PM

Thanks Paul I will give that a go.

Cheers

Jamie

Title: Re: Mainline input selector
Post by: Strikkflypilot on September 11, 2015, 10:36:02 PM

I can report the same as Jamie here, rather loud pop on the left channel when flipping from input 2 to input 1, not so much the other way around.
The chassis of the switch seems to me to grounded to the plate already when it is screwed tight.

Title: Re: Mainline input selector
Post by: Strikkflypilot on October 06, 2015, 09:10:17 AM

I just noticed something else.
With input channel 1 selected, though nothing connected, I can, very quietly, hear the source playing on input channel 2.

Title: Re: Mainline input selector
Post by: NightFlight on October 13, 2015, 04:03:39 PM

That's crosstalk.

Title: Re: Mainline input selector
Post by: Doc B. on October 13, 2015, 06:25:26 PM

Actually that's not cross talk. Cross talk is left bleeding into right and vice versa. This is simply one source selection coming thru the ground to another source selection. It's very simple to fix. Turn off the source you are not listening to.

Title: Re: Mainline input selector
Post by: Strikkflypilot on October 13, 2015, 06:47:25 PM

Thanks Doc.
I was thinking to try some shielded twisted pairs.
Your solution is a bit easier and lot less costly:)

Title: Re: Mainline input selector
Post by: Paul Birkeland on October 14, 2015, 08:40:34 AM

Quote from: Strikkflypilot on October 13, 2015, 06:47:25 PM

I was thinking to try some shielded twisted pairs.

That's what's in there now. 

Title: Re: Mainline input selector
Post by: Strikkflypilot on October 14, 2015, 10:04:55 AM

Of course, You're right, a shielded Cat 5 with twisted pairs..
I was thinking of one shield per pair, but am happy I don't have to now:)