Effects loop for a microphone

[liddokun]

Hey y'all,

A friend of mine has asked me to build something for him and looking for a little direction.

He essentially wants an effects loop with a blend control, for use with a microphone.

Essentially dynamic mic in, then to the blend control, then to output feeding a line out.

I know I'm going to need a preamp to boost mic level to instrument level, and then maybe a buffer to feed the blend pot.

Then another preamp to boost signal to line level. 

Anyone have any idea which circuits I should be looking at to cobble this together?

[amptramp]

One of the items that is often used in radio studios after a microphone is an allpass filter like a phaser but without the oscillator that changes phase.  The reason for this is the ear is not that sensitive to phase so it allows the harmonic peaks to come in at a different time and avoids overmodulation.  This could give him a loud sound that does not overload the speech amp and unlike a guitar amp, overloading a speech amp sounds terrible.

[liddokun]

I was looking at moosapotamus paralooper as well as the brass blender. 

A mic preamp feeding the paralooper, the paralooper feeding a balanced line driver. 

[patrick398]

I've been meaning to build one of those £5 preamps that people were raving about. There's a few articles about it online, blind tested against some high end preamps and it came out on top. Uses the INA217 IC, could be a cheap low cost solution to the mic pre section of the circuit

[iainpunk]

there are xlr to stereo jack converters. but i recommend buying a set of female and male XLR connectors. if you then just ignore the middle connector, add an op amp for some gain(volume boost) and use an op amp for the return to split and invert the signal. instrument level volume should be more than plenty to send to front of house, since its way higher than microphone level.