hello everyone
I am making a portable, battery powered audio system. There is a balanced preamp at the input, then a buffer stage, then the signal line is split into two, one line has an hpf filter, the other has an lpf filter, then it goes to the power amplifier. The circuit is stereo and I am using a total of 8 ne5532s, and a simple two resistor voltage divider for bias. My question is; Should I bias the 8 opamps using separate resistors or can I have a common bias for all of them?
I am making a portable, battery powered audio system. There is a balanced preamp at the input, then a buffer stage, then the signal line is split into two, one line has an hpf filter, the other has an lpf filter, then it goes to the power amplifier. The circuit is stereo and I am using a total of 8 ne5532s, and a simple two resistor voltage divider for bias. My question is; Should I bias the 8 opamps using separate resistors or can I have a common bias for all of them?
For battery power use just one bias divider to minimize wasted current.
Bypass that node to ground with at least 10uF.
Bypass that node to ground with at least 10uF.
Use TLE2426 to produce the reference bias. Or if you have resistive divider use a unity opamp buffer.
Using an active mid-rail is better - less chance of crosstalk as its stiff w.r.t ground from DC upwards, and you can use a device with good current output so that the clients of the mid-rail can use smaller value resistors for low-noise without over-loading it, and it can serve as output ground return too.