Adding a Pre-Fader Listen to Line Mixer

FLD · 28th August 2008, 08:04 PM

How hard would it be to add Pre-Fader Listen buttons to a little and simple line mixer? I couldn't find anyone who has done somenthing like this.

richie00boy · 28th August 2008, 08:06 PM

Has the mixer already got a headphone monitor output?

FLD · 29th August 2008, 09:57 PM

As you can see its a very simple looking device so it should be rather easy to figure out how it works? And i could even use the useless Phono/Line buttons as the trigger for PFL.

So i figure i just build a basic Summing Op-Amp Amplifier and hook its output to the headphone jack. Then find correct spots to steal the inputs and hook them to the summing device trought those buttons? Does this make any sense?

Heres the picture:

richie00boy · 1st September 2008, 02:27 PM

It should be a case of as you say a summing op-amp taking it's feeds off the top pin of each fader pot. Don't forget to include a further summing stage to correct the inversion or it may sound funny monitoring in a live situation. Probably needs tracks cutting at the input to the headphone stage to splice the new op-amp output on to.

28th August 2008, 08:04 PM	#1
FLD diyAudio Member Join Date: Aug 2008	Adding a Pre-Fader Listen to Line Mixer How hard would it be to add Pre-Fader Listen buttons to a little and simple line mixer? I couldn't find anyone who has done somenthing like this.

28th August 2008, 08:06 PM	#2
richie00boy Did it Himself diyAudio Member Join Date: Nov 2003 Location: Gloucestershire, England, UK	Has the mixer already got a headphone monitor output? __________________ www.readresearch.co.uk my website for UK diy audio people - designs, PCBs, kits and more

1st September 2008, 02:27 PM	#4
richie00boy Did it Himself diyAudio Member Join Date: Nov 2003 Location: Gloucestershire, England, UK	It should be a case of as you say a summing op-amp taking it's feeds off the top pin of each fader pot. Don't forget to include a further summing stage to correct the inversion or it may sound funny monitoring in a live situation. Probably needs tracks cutting at the input to the headphone stage to splice the new op-amp output on to. __________________ www.readresearch.co.uk my website for UK diy audio people - designs, PCBs, kits and more

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29th August 2008, 09:57 PM	#3
FLD diyAudio Member Join Date: Aug 2008	As you can see its a very simple looking device so it should be rather easy to figure out how it works? And i could even use the useless Phono/Line buttons as the trigger for PFL. So i figure i just build a basic Summing Op-Amp Amplifier and hook its output to the headphone jack. Then find correct spots to steal the inputs and hook them to the summing device trought those buttons? Does this make any sense? Heres the picture:

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