Simple Line Level Mixer (Unity Gain)

Noumenon · 29th December 2008, 07:25 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, 08:05 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, 04:55 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 · 29th December 2008, 11:34 PM

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

29th December 2008, 07:25 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, 08:05 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." - Ninja

29th December 2008, 11:34 PM	#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." - Ninja

Thread Tools	Search this Thread
Show Printable Version Email this Page	Search this Thread: Advanced Search

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
A Heretical Unity gain line stage	SY	Tubes / Valves	86	26th April 2013 10:18 AM
Simple discrete unity gain buffer	tcpip	Solid State	111	7th June 2007 05:55 PM
line level modular mixer?	post78	Analog Line Level	0	21st February 2007 08:55 AM
Heretical Unity Gain line stage PLUS a little gain ?	yagas	Tubes / Valves	7	24th January 2006 01:30 PM


	Please consider donating to help us continue to serve you. Ads on/off / Custom Title / More PMs / More album space / Advanced printing & mass image saving

29th December 2008, 04:55 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?

New To Site?	Need Help?
Register to Participate Search Privacy Statement Contact Us	Frequently Asked Questions Did you forget your password? Mark Forums Read