How best to implement image mode controls

adastra · 21st January 2013, 07:29 PM

Hello,
apologies in advance for this simple question, but I'm a beginner and looking for advice.

I've built an Aikido-based preamp (linestage really) with a 50K Alps motorized volume control and would like to implement a "stereo-reverse-left only-right only-mono" switch, as seen in many ARC preamps and so on. Old-fashioned perhaps, but assuming I really desire this feature, I'm looking for help on the best way to implement such a switch. I suppose the main question is where it should fall in the signal chain - before volume control, between volume control and linestage, or after linestage?

If anybody cares to offer advice or opinions, I'll have some other questions, but let's start with that.

Thanks in advance,
Adastra.

sreten · 21st January 2013, 08:14 PM

Hi,

Presuming you never use a full volume setting, after the volume pot is
the only place you can correctly short left and right together for mono,
the stereo pot will act as a passive mixer, isolating each channel.

rgds, sreten.

adastra · 22nd January 2013, 04:41 PM

Thanks Sreten, I'll keep at it.

21st January 2013, 07:29 PM	#1
adastra diyAudio Member Join Date: Sep 2011	How best to implement image mode controls Hello, apologies in advance for this simple question, but I'm a beginner and looking for advice. I've built an Aikido-based preamp (linestage really) with a 50K Alps motorized volume control and would like to implement a "stereo-reverse-left only-right only-mono" switch, as seen in many ARC preamps and so on. Old-fashioned perhaps, but assuming I really desire this feature, I'm looking for help on the best way to implement such a switch. I suppose the main question is where it should fall in the signal chain - before volume control, between volume control and linestage, or after linestage? If anybody cares to offer advice or opinions, I'll have some other questions, but let's start with that. Thanks in advance, Adastra.

21st January 2013, 08:14 PM	#2
sreten diyAudio Member Join Date: Nov 2003 Location: Brighton UK	Hi, Presuming you never use a full volume setting, after the volume pot is the only place you can correctly short left and right together for mono, the stereo pot will act as a passive mixer, isolating each channel. rgds, sreten. __________________ There is nothing so practical as a really good theory - Ludwig Boltzmann When your only tool is a hammer, every problem looks like a nail - Abraham Maslow

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22nd January 2013, 04:41 PM	#3
adastra diyAudio Member Join Date: Sep 2011	Thanks Sreten, I'll keep at it.