Hi All,
In my 30-years old EMT console, the solo function is carried out by interrupting the signal of all other channels (Solo-in-place).
The signal interruption is done using a Cmos switch (Intersil/Harris IH5352) followed by an opamp configured as a buffer (audio to positive in, out fed back to negative in).
I found this config to produce annoying pops when solo'ing, and changing the buffer to an inverting gain of -1 amplifier seems to cure this (I am of course aware of the resulting polarity reverse).
I configured the inverting opamp with a 22K R in and a 22K R feedback, and a parallel feedback compensation cap.
My question: Do I take the opamp's positive in to ground using a 0 Ohm jumper, or using a resistor that equals 22K//22K? Pros/cons?
Thanks for your insights!
Best Rogy
In my 30-years old EMT console, the solo function is carried out by interrupting the signal of all other channels (Solo-in-place).
The signal interruption is done using a Cmos switch (Intersil/Harris IH5352) followed by an opamp configured as a buffer (audio to positive in, out fed back to negative in).
I found this config to produce annoying pops when solo'ing, and changing the buffer to an inverting gain of -1 amplifier seems to cure this (I am of course aware of the resulting polarity reverse).
I configured the inverting opamp with a 22K R in and a 22K R feedback, and a parallel feedback compensation cap.
My question: Do I take the opamp's positive in to ground using a 0 Ohm jumper, or using a resistor that equals 22K//22K? Pros/cons?
Thanks for your insights!
Best Rogy