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 Forum index » DIY Hardware and Software
I need a very simple mixer
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Lorenzo



Joined: Nov 09, 2008
Posts: 349
Location: Trieste - Italyjstan

PostPosted: Mon Feb 10, 2014 11:59 am    Post subject: I need a very simple mixer Reply with quote  Mark this post and the followings unread

Hi,
I need a simple mixer to mix 2-3 mono lo-fi audio signals.
I need 2-3 line input and the chance to adjust the output volume.
maybe 9v battery...

can you suggest me some schematics?

Actually I made a bodge solding 2 cables in one ouput... it works but... Embarassed

Thank you!

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PHOBoS



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PostPosted: Mon Feb 10, 2014 12:25 pm    Post subject: Re: I need a very simple mixer Reply with quote  Mark this post and the followings unread

You might be able to get away with a passive mixer dependig on the level of you signals. Just an attenuator on every input tied together with 1K resistors.
Or you could use the attached schematic for an active mixer. (you can add attenuators on the inputs for level control if you want)


mixer (single power, virtual ground).gif
 Description:
basic single supply mixer
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mixer (single power, virtual ground).gif



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Lorenzo



Joined: Nov 09, 2008
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Location: Trieste - Italyjstan

PostPosted: Mon Feb 10, 2014 12:38 pm    Post subject: Re: I need a very simple mixer Reply with quote  Mark this post and the followings unread

PHOBoS wrote:
You might be able to get away with a passive mixer dependig on the level of you signals. Just an attenuator on every input tied together with 1K resistors.
Or you could use the attached schematic for an active mixer. (you can add attenuators on the inputs for level control if you want)


oh thanks !
passive mixer would be great! I have to try if I have enought signals level...

AMZ mixer seems to be a pretty good solution, it is a pitty I can't use it with 9v battery so I do not need power supply... anyway thank you!!

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PHOBoS



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PostPosted: Mon Feb 10, 2014 1:28 pm    Post subject: Reply with quote  Mark this post and the followings unread

It should work fine on a 9V battery Cool
(and you can leave out the 100 ohm resistor or better place it before the diode)

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Lorenzo



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PostPosted: Mon Feb 10, 2014 3:32 pm    Post subject: Reply with quote  Mark this post and the followings unread

thank you so much!
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Dave Kendall



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PostPosted: Wed Feb 12, 2014 1:28 pm    Post subject: Reply with quote  Mark this post and the followings unread

You might want to check out the TL061 - it uses quite a bit less current than the TL071, at the expense of some slight increase in noise. In practice any extra noise was not noticable in the one I built for a guitarist, and the batteries last a lot longer.

A couple of notes - the Orman circuit uses a 150K resistor in the opamp's feedback loop to give some amplification when the output level is turned up all the way. If you don't need that, then replacing the 150K with a 100K will give unity gain at the output.

The circuit also has an inverted output - this may not be a problem. If it is, then simply use a TL062, and wire the second opamp to the output of the first, before the 10uF cap, with a 100K series resistor into the - input, and a 100K resistor from the output to the - input. Tie the + input of the second opamp to the same point as the + input on the first opamp. This is the classic dual inverting mixer.

cheers,
Dave

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Lorenzo



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PostPosted: Mon Feb 17, 2014 12:06 pm    Post subject: Reply with quote  Mark this post and the followings unread

Dave Kendall wrote:


cheers,
Dave


...noise is good!
thank you!

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JingleJoe



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PostPosted: Thu Feb 20, 2014 11:55 am    Post subject: Reply with quote  Mark this post and the followings unread

I was going to suggest what phobos was saying so I'll add this:

Posted Image, might have been reduced in size. Click Image to view fullscreen.

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Lorenzo



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PostPosted: Sat Feb 22, 2014 2:55 am    Post subject: Reply with quote  Mark this post and the followings unread

JingleJoe wrote:
I was going to suggest what phobos was saying so I'll add this:

[/img]


... Rmix1-2-3 could be pots so we have the chance to adjust the input volume. It' ok!
but I think I will try TL071... I think I have a couple at home...

thanks

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PHOBoS



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PostPosted: Sun Feb 23, 2014 4:20 am    Post subject: Reply with quote  Mark this post and the followings unread

Lorenzo wrote:
... Rmix1-2-3 could be pots so we have the chance to adjust the input volume.
Actually you would need to add the pots before the resistors like this:

Posted Image, might have been reduced in size. Click Image to view fullscreen.
(image from beavisaudio)

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JingleJoe



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PostPosted: Tue Mar 11, 2014 1:21 pm    Post subject: Reply with quote  Mark this post and the followings unread

that^ right there is how i do most of my signal mixing, nice depiction phobos Wink you can use different value resistors aswell, to weight the different channels so one input could be louder or quieter Smile
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Lorenzo



Joined: Nov 09, 2008
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PostPosted: Tue Mar 25, 2014 6:02 am    Post subject: Reply with quote  Mark this post and the followings unread

PHOBoS wrote:
Lorenzo wrote:
... Rmix1-2-3 could be pots so we have the chance to adjust the input volume.
Actually you would need to add the pots before the resistors


ooh thanks!

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col2



Joined: Feb 15, 2014
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PostPosted: Wed Apr 09, 2014 6:35 am    Post subject: Reply with quote  Mark this post and the followings unread

Iv'e used Circuit 3 from this site.

http://www.all-electric.com/schematic/simp_mix.gif

works very well!
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