summing amplifier: does it really need output trafo?

rhythmsandy · 28th September 2012, 12:42 PM

one of my friend is not happy with the summing amplifier and he wanted me to check why is it not that good. Ive checked couple of products but they have a output trafo. I think thats why it had some distortion...

does it really required to have output trafo for summing amp?
the schematic is very simple File:Op-Amp Summing Amplifier.svg - Wikipedia, the free encyclopedia

I would like to do something like that in wikipedia in that case do we need to have the output transformer? can we eliminate that? Does it affect anything?

djoffe · 28th September 2012, 05:08 PM

there is no need to pair a summing amp with an output transformer. The system would have to be just a bit unusual to have that requirement. For example, if you needed a balanced output with very good common mode properties, or very high ground loop isolation. Most common home hi-fi setups don't need that.

Akitika GT-101

Update My Dynaco

28th September 2012, 12:42 PM	#1
rhythmsandy diyAudio Member Join Date: Aug 2012	summing amplifier: does it really need output trafo? one of my friend is not happy with the summing amplifier and he wanted me to check why is it not that good. Ive checked couple of products but they have a output trafo. I think thats why it had some distortion... does it really required to have output trafo for summing amp? the schematic is very simple File:Op-Amp Summing Amplifier.svg - Wikipedia, the free encyclopedia I would like to do something like that in wikipedia in that case do we need to have the output transformer? can we eliminate that? Does it affect anything?

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
Summing two amplifier outputs with just a resistor	perfknee	Solid State	9	9th October 2011 04:51 AM
Got a big output trafo I want to use.	lawbadman	Tubes / Valves	27	29th October 2008 04:14 PM
How does a summing circuit work in terms of input/output impedances?	Saurav	Everything Else	3	16th May 2003 04:10 PM

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


	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

28th September 2012, 05:08 PM	#2
djoffe diyAudio Member Join Date: Oct 2008	there is no need to pair a summing amp with an output transformer. The system would have to be just a bit unusual to have that requirement. For example, if you needed a balanced output with very good common mode properties, or very high ground loop isolation. Most common home hi-fi setups don't need that. Akitika GT-101 Update My Dynaco