I'm new to diyAudio, so I'm not even sure I'm posting in the right forum. I've come up with an op amp-based design for a 4 or 6 input microphone mixer, and I'm looking for any tips on the design. I'm attaching a schematic.
The mic input stages are differential amps with 40 dB gain, and these are combined in a summing stage with unity gain per channel. For the microphone level output, I'm planning to use a Jensen transformer, the same one that's used in DI boxes.
I didn't use any caps in the design. Should there be a blocking cap before the summing stage, or maybe before the transformer?
Is the overall gain appropriate for a mixer with mic-level output? Any ideas will be appreciated.
Thanks!
The mic input stages are differential amps with 40 dB gain, and these are combined in a summing stage with unity gain per channel. For the microphone level output, I'm planning to use a Jensen transformer, the same one that's used in DI boxes.
I didn't use any caps in the design. Should there be a blocking cap before the summing stage, or maybe before the transformer?
Is the overall gain appropriate for a mixer with mic-level output? Any ideas will be appreciated.
Thanks!
Hi,
Your mixer or this :
Behringer Xenyx 502 Mixer at Gear4Music.com
What would you choose ?
or this :
or this for 4 balanced mic inputs :
rgds, sreten.
Yuor a lot better off buying and then modding if quality really matters.
Your mixer or this :
Behringer Xenyx 502 Mixer at Gear4Music.com
What would you choose ?
or this :
or this for 4 balanced mic inputs :
rgds, sreten.
Yuor a lot better off buying and then modding if quality really matters.
Last edited:
Whoops sorry forgot to add about adding a resistor to make inputs differential.
Hi,
Yes, but there is still a lot missing from the schematic.
Buy and mod if needed is my attitude.
rgds, sreten.
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