Hi Guys,
I.m having some difficultys. I.ve been building a dual channel mic preamp quite some time now. Had some hum problems, plain mistakes you name it.
It,s working now but i,m having problems balancing the signal. because there is still some noise present and i,m searching for ways to turn the noise down. as you can tell the schematic is not finished but it shows what i,m doing.
As soon as i ground the Center-tap of the O.t. on the primairy side, the signal get crackely and drops the gain significantly.
If i ground the centertap on the secondairy side of the Ot the residual noise drops to acceptable levels, no crackles, but with a loss in some high end frequentys. Still the signal seems o.k. but less bright,
Is the latter situation normal? What is commen practice?
i guess i never really understood....
Thanks in advance,
Pief
P.s.: on theoutput xlr i.ve led the ground terminal to the chassis right next to it. Maybe the ground on the xlr is suppose to go to the ct on the secondairy?
I.m having some difficultys. I.ve been building a dual channel mic preamp quite some time now. Had some hum problems, plain mistakes you name it.
It,s working now but i,m having problems balancing the signal. because there is still some noise present and i,m searching for ways to turn the noise down. as you can tell the schematic is not finished but it shows what i,m doing.
As soon as i ground the Center-tap of the O.t. on the primairy side, the signal get crackely and drops the gain significantly.
If i ground the centertap on the secondairy side of the Ot the residual noise drops to acceptable levels, no crackles, but with a loss in some high end frequentys. Still the signal seems o.k. but less bright,
Is the latter situation normal? What is commen practice?
i guess i never really understood....
Thanks in advance,
Pief
P.s.: on theoutput xlr i.ve led the ground terminal to the chassis right next to it. Maybe the ground on the xlr is suppose to go to the ct on the secondairy?