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Designing a Mic Preamp/Mixer - Help w/ First Attempt?
I hope this is not off topic here -
I am designing a mic premamp/mixer for our band's practice sessions. We have one main singer and at least one or two backup singers. I built a simple circuit that has 4 balanced inputs mixing to one output with about 52 dB maximum gain per channel. Channel One has an effects loop. There is no phantom power as we are using dynamic mics for now. While it worked OK in practice, we had trouble matching levels to the rest of the system. I am wondering what other features common preamp/mixers have and how to best implement them - like perhaps clipping indicators, VU meters, an FX bus (rather than just a simple loop on channel one only), built in compression, eq, etc. Also, I want to operate as a +4dB device but Im not sure what that means when you dont even know where "zero" is (without a meter) Is this correct? I am assuming that +4dB means 4dB over .775 volts into a 600 ohm load, which would be about 1.228 volts. From what I have read, its good to shoot for a 20dB headroom which I am guessing means being able to swing over 12 volts into a 600 ohm load. Also, is it more common to have the fader for a channel affect the send level for the effects or would the fader come after the send and return? If anyone knows any good sources of technical info on such matter, I would appreciate hearing from you. Are there any good web sites that outline the process of desiging custom live/pro audio equipment? Most of my previous design experience is in the areas of home audio and guitar amplification, so some aspects of this project I have not enountered before now. thanks in advance, David Forsyth |
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