Hi all,
I'm wanting to design a simple mono mixer for live PA use with an acoustic type band - cajon, vocals, guitar etc. The focus is on simplicity of design and build, quality and reliability. I would like the input channels to be modular, so I can build them individually and stack as many as I need into the master section (within reason!)
Simple Mono Mixer Design
Mic Input Channels x5
XLR input socket (mics will all likely be dynamic 57/58s)
Low cut switch (to remove rumble and low end from channels that don't need it)
Phase switch (i've read this can help with eliminating feedback but happy to leave out if this is BS)
Mute switch (convenient way to kill a channel)
Tone control pot (a simple guitar pedal style treble cut/boost)
Channel volume pot
Master Section
Power switch (I may run the mixer from an external wall wart or laptop style supply)
Aux 3.5mm stereo jack input w/vol (for music from my phone where needed or using a backing track)
Master output mute switch (a "KILL" switch
)
Master 2 band EQ (treble and bass cut/boost)
Master volume pot
LED VU meter (a visual indication of the output being at line level - if there's a simpler way, great!)
Phono / 1/4" jack outputs (standard line level)
There are plenty of simple summing preamp/mixer designs kicking about the web, but nothing that uses NE5532 opamps (which is what I would like to use) and incorporates all of the features I want. Some have an opamp on every input channel and then another one on the master channel, and some are passive into the master channel. I am presuming that active channels are better so would like to go with that. I am also aware that the unit may need additional PSU filtering to get rid of any noise from a switchmode power supply unit.
So, if I've covered the pertinent details, is there anyone interested in helping me?
Regards,
James
I'm wanting to design a simple mono mixer for live PA use with an acoustic type band - cajon, vocals, guitar etc. The focus is on simplicity of design and build, quality and reliability. I would like the input channels to be modular, so I can build them individually and stack as many as I need into the master section (within reason!)
Simple Mono Mixer Design
Mic Input Channels x5
XLR input socket (mics will all likely be dynamic 57/58s)
Low cut switch (to remove rumble and low end from channels that don't need it)
Phase switch (i've read this can help with eliminating feedback but happy to leave out if this is BS)
Mute switch (convenient way to kill a channel)
Tone control pot (a simple guitar pedal style treble cut/boost)
Channel volume pot
Master Section
Power switch (I may run the mixer from an external wall wart or laptop style supply)
Aux 3.5mm stereo jack input w/vol (for music from my phone where needed or using a backing track)
Master output mute switch (a "KILL" switch
Master 2 band EQ (treble and bass cut/boost)
Master volume pot
LED VU meter (a visual indication of the output being at line level - if there's a simpler way, great!)
Phono / 1/4" jack outputs (standard line level)
There are plenty of simple summing preamp/mixer designs kicking about the web, but nothing that uses NE5532 opamps (which is what I would like to use) and incorporates all of the features I want. Some have an opamp on every input channel and then another one on the master channel, and some are passive into the master channel. I am presuming that active channels are better so would like to go with that. I am also aware that the unit may need additional PSU filtering to get rid of any noise from a switchmode power supply unit.
So, if I've covered the pertinent details, is there anyone interested in helping me?
Regards,
James