multiple input amp

ashade · 7th October 2006, 01:09 AM

i'm building avey simple amp for my guitar and some mics... it should have 4 inputs, one for the guitar, with pedals etc and 3 for the mics or other guitars.. to mix the four signals, is it enough to add them using a simple op amp adder circuit?

drummer_Dave · 25th October 2006, 04:19 PM

Good enough is relative. How good do you want it to be. I believe that the proper way to go about this is to at least have an input buffer op amp (or some other buffer ina134 etc...) for each of the input signals then that way you can cator each input the the proper impedances and gains then mix them all down with summing amplifier circuit. Either way Id say try just the summing amp and see if it works for you. Good luck, keep us posted

pinkmouse · 25th October 2006, 04:24 PM

http://en.wikipedia.org/wiki/Virtual_ground

7th October 2006, 01:09 AM	#1
ashade diyAudio Member Join Date: Aug 2005	multiple input amp i'm building avey simple amp for my guitar and some mics... it should have 4 inputs, one for the guitar, with pedals etc and 3 for the mics or other guitars.. to mix the four signals, is it enough to add them using a simple op amp adder circuit?

25th October 2006, 04:24 PM	#3
pinkmouse diyAudio Moderator Join Date: Apr 2002 Location: Chatham, England	http://en.wikipedia.org/wiki/Virtual_ground __________________ Al I conceive of nothing, in religion, science or philosophy, that is more than the proper thing to wear, for a while. Charles Fort

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25th October 2006, 04:19 PM	#2
drummer_Dave diyAudio Member Join Date: Oct 2006	Good enough is relative. How good do you want it to be. I believe that the proper way to go about this is to at least have an input buffer op amp (or some other buffer ina134 etc...) for each of the input signals then that way you can cator each input the the proper impedances and gains then mix them all down with summing amplifier circuit. Either way Id say try just the summing amp and see if it works for you. Good luck, keep us posted

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