Hi All,
I'm looking for some help with my mixer.
I know this type of circuit has been done to death, but I have a specific need that has to fit into a specific box so nothing off the shelf will do.
Basically, it's a mic/line mixer (think SM58 and iPod) with a link input to mix other units in. so think of an installed location, with 12VDC fed down a pair of wires, and line level audio back (about 200'+) then the same thing to unit#2 (sometimes to a 3rd, but rarely)
the circuit as shown here http://www.twin-x.com/groupdiy/index.php?cat=10770 is working well on the breadboard but I'm hoping for pointers on any component values that could be optimized.
Also any tips on how to avoid ground loop hums (due to the long lengths of wire and varying grounds between different parts of buildings)
And guidelines for minimizing cellphone interference.
a lot of this is hard or impossible to test on a breadboard so hopefully you can steer me in the right direction before I do my PCB layout.
I'm hoping to go all SMT (or as much as possible) which will give me most of the bottom side of the PCB as a ground plane, which I'm hoping will go a long way to avoid interference.
Thanks in advance!
Jason
I'm looking for some help with my mixer.
I know this type of circuit has been done to death, but I have a specific need that has to fit into a specific box so nothing off the shelf will do.
Basically, it's a mic/line mixer (think SM58 and iPod) with a link input to mix other units in. so think of an installed location, with 12VDC fed down a pair of wires, and line level audio back (about 200'+) then the same thing to unit#2 (sometimes to a 3rd, but rarely)
the circuit as shown here http://www.twin-x.com/groupdiy/index.php?cat=10770 is working well on the breadboard but I'm hoping for pointers on any component values that could be optimized.
Also any tips on how to avoid ground loop hums (due to the long lengths of wire and varying grounds between different parts of buildings)
And guidelines for minimizing cellphone interference.
a lot of this is hard or impossible to test on a breadboard so hopefully you can steer me in the right direction before I do my PCB layout.
I'm hoping to go all SMT (or as much as possible) which will give me most of the bottom side of the PCB as a ground plane, which I'm hoping will go a long way to avoid interference.
Thanks in advance!
Jason