I would like to build a microphone preamp with dual power supply and 48v phantom.
I found these two circuits on the net which are a bit different from each other, I mean
to the part circled in red. In #1 the voltages for the 48v are taken from the diode bridge
from an alternating branch and from the positive. In n.2 both are taken from the alternate branches.
Maybe there is a mistake? Which of the two is the correct one?
Thank you
I found these two circuits on the net which are a bit different from each other, I mean
to the part circled in red. In #1 the voltages for the 48v are taken from the diode bridge
from an alternating branch and from the positive. In n.2 both are taken from the alternate branches.
Maybe there is a mistake? Which of the two is the correct one?
Thank you
They are both correct, just drawn differently one uses the -ve rail as a reference and the other uses the 0v rail. Makes no difference.
