Input source switching

Stuey · 14th September 2006, 12:33 PM

Hi there,

Just a simple one; for input source switching in an integrated NIGC, I want to use a simple Alpha rotary switch. Should I use a break before make switch, or will this cause noises like when used in a stepped attenuator?

Cheers

Stuey

Nuuk · 14th September 2006, 12:54 PM

Break before make is fine for source select.

Stuey · 14th September 2006, 01:46 PM

Thanks Nuuk.

Leolabs · 14th September 2006, 02:57 PM

Try some quality rotary switch like Lorlin,CK....

AndrewT · 15th September 2006, 08:37 AM

Hi,
break before make will leave the input disconnected for a short while.

Is the amplifier stable when the input is left floating?

Some inputs need to see a lowish source impedance/resistance to remain stable.

rabbitz · 15th September 2006, 01:07 PM

.... or an Elma 04-1261. Got mine from Michael Percy. The Alpha can be very fickle and had one that lasted a month as it just gouged tracks.

The LM3875 NIGC I have has no problems with a break before make switch.... not a peep.

Stuey · 2nd October 2006, 08:46 AM

Sorry guys; I hadn't noticed you'd replied since my last post.

I ended up leaving the amp with only one input at this stage (my first build) so as to concentrate on getting all its general operation correct first. It's now running well.

I've changed my mind to build a simple and separate pre-amp so that I can incorporate a phono stage and a remote volume control.

Andrew, thanks for the input again - I'll keep that in mind.

Cheers

Stuey

14th September 2006, 12:33 PM	#1
Stuey diyAudio Member Join Date: Mar 2006 Location: Perth, Western Australia	Input source switching Hi there, Just a simple one; for input source switching in an integrated NIGC, I want to use a simple Alpha rotary switch. Should I use a break before make switch, or will this cause noises like when used in a stepped attenuator? Cheers Stuey

14th September 2006, 12:54 PM	#2
Nuuk diyAudio Member Join Date: Feb 2003 Location: Somerset, SW England	Break before make is fine for source select. __________________ The truth need not be veiled, for it veils itself from the eyes of the ignorant.

15th September 2006, 08:37 AM	#5
AndrewT diyAudio Member Join Date: Jul 2004 Location: Scottish Borders	Hi, break before make will leave the input disconnected for a short while. Is the amplifier stable when the input is left floating? Some inputs need to see a lowish source impedance/resistance to remain stable. __________________ regards Andrew T.

15th September 2006, 01:07 PM	#6
rabbitz diyAudio Member Join Date: Jul 2003 Location: Newcastle, Australia	.... or an Elma 04-1261. Got mine from Michael Percy. The Alpha can be very fickle and had one that lasted a month as it just gouged tracks. The LM3875 NIGC I have has no problems with a break before make switch.... not a peep. __________________ Terminated

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14th September 2006, 01:46 PM	#3
Stuey diyAudio Member Join Date: Mar 2006 Location: Perth, Western Australia	Thanks Nuuk.

14th September 2006, 02:57 PM	#4
Leolabs diyAudio Member Join Date: Dec 2004 Location: Bukit Mertajam	Try some quality rotary switch like Lorlin,CK....

2nd October 2006, 08:46 AM	#7
Stuey diyAudio Member Join Date: Mar 2006 Location: Perth, Western Australia	Sorry guys; I hadn't noticed you'd replied since my last post. I ended up leaving the amp with only one input at this stage (my first build) so as to concentrate on getting all its general operation correct first. It's now running well. I've changed my mind to build a simple and separate pre-amp so that I can incorporate a phono stage and a remote volume control. Andrew, thanks for the input again - I'll keep that in mind. Cheers Stuey

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