WEBENCH® Tools/TL072: TL072 pre-amp design

Hi,

that's helpful info. I just starting design:  in general, it is clear about the design of the electret microphone preamp. But I'm not sure about line-in pre-amp design, here is much less clarity.

I think, the line-in preamp should be as buffer amplifier, which accept Line outputs signal from various consumer audio equipment,  buffer amplifier should provide some gain and impedance matching.

The circuit application is LED controller to create lighting effects for LED lights.

I not sure what should be Gain, and what design will be suitable here. In general, audio signal from line-in goes to Master level Gain trimpot, and the 4 bandwidth Pots, then on LM324 circuit that has 4 active Band-pass filters for four different frequencies. From there signal goes to 2N3904 transistors, which feed MOSFETs, which have LED strips connected. So the MOSFETs controls LED flashing. I think the gain should be some minimal.

Hi,

I assume that every design is unique and has their own specific requirements and needs.

My design has different approach, optimized for it's own context, it  has two inputs, one for mic, another for line-in, selected by switch.

In particular I'm not sure about proper buffer amplifier for line-in input.

The requirements are general non-inverting opamp, +12V single power supply, gain 2 or 3

Hi Wilson,

Take a look at this circuit cookbook on the non-inverting configuration, it walks through the design steps. Change the parameters to what you need for your system.

http://www.ti.com/lit/an/sboa271/sboa271.pdf 

Thanks,

Paul