Intel on mic pre low-cut circuits!

[djmiggymigz]

Hoping that someone can either point me in the right direction via an existing post or help me out here. Currently working on a 312 preamp clone and I'm hoping/wondering if it'd be possible to include a switchable (on/off) low cut filter prior to the opamp in the circuit. I have an audient 8pre with lowcuts on every channel and I love being able to clean up a bit while tracking. Currently laying out the design in KiCad and the 312 circuit is so simple that I have a ton of empty space on the pcb and would love to implement this.

Definitely worth noting that I am certainly a beginner when it comes to circuit design. I'm thinking that the filter would be added before the opamp but after the input transformer? That's more or less just a guess though.

 

[pasarski]

Definitely. If your fine with a 1st order high pass filter you only need three components, including the switch (or two if the preamp already has some kind of a high pass filter at the input). Search "RC filter".