Simple Line Level Mixer (Unity Gain)

Noumenon · 29th December 2008, 08:25 AM

Hi.
I wanna build a simple line level summing device for use in my guitar rack. Now, I've read that you can just put resistors on the hot leg of each input, but also that this causes attenuation and might cause channel bleed. From what I understood you could use op amps instead. How would these be connected in a simple 2-1 mixer? Also, is this possible to do with 9VAC?

theAnonymous1 · 29th December 2008, 09:05 AM

Check out "Figure 2" at the link below for a simple op-amp based mixer.

http://sound.westhost.com/project94.htm

Noumenon · 29th December 2008, 05:55 PM

Ah, got the same tip from another site.

How do I get rid of that master volume, just skip it and put a connection between R116 and R117?

theAnonymous1 · 30th December 2008, 12:34 AM

No, just leave out VR104 and R117, but keep the R116 output resistor.

29th December 2008, 08:25 AM	#1
Noumenon diyAudio Member Join Date: Aug 2007	Simple Line Level Mixer (Unity Gain) Hi. I wanna build a simple line level summing device for use in my guitar rack. Now, I've read that you can just put resistors on the hot leg of each input, but also that this causes attenuation and might cause channel bleed. From what I understood you could use op amps instead. How would these be connected in a simple 2-1 mixer? Also, is this possible to do with 9VAC?

29th December 2008, 09:05 AM	#2
theAnonymous1 diyAudio Member Join Date: Feb 2004 Location: Anonymityville	Check out "Figure 2" at the link below for a simple op-amp based mixer. http://sound.westhost.com/project94.htm __________________ "If you don't like funerals don't kick sand in ninja's face."

30th December 2008, 12:34 AM	#4
theAnonymous1 diyAudio Member Join Date: Feb 2004 Location: Anonymityville	No, just leave out VR104 and R117, but keep the R116 output resistor. __________________ "If you don't like funerals don't kick sand in ninja's face."

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29th December 2008, 05:55 PM	#3
Noumenon diyAudio Member Join Date: Aug 2007	Ah, got the same tip from another site. How do I get rid of that master volume, just skip it and put a connection between R116 and R117?

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