wado1942

That was my first idea but I thought the impedance change would alter the sound quality. I guess it would be minimal since there's no caps before the opamp.

This will be driven from a headphone amp which is designed for a 600 Ohm load. So to switch this circuit to a .1X-1X gain, I need to put in a switchable L-pad in front of the 1K resistor?

Well the inverting amp configuration works like a charm so I'm going with that. My next challenge is adding a -10dB switch. Any suggestions? I was thinking a resistor to shunt part of the input signal to ground but I wouldn't know how to calculate it.

Thanks for the quick replies everybody. I actually tried running into the inverting input and got nothing out of it. It didn't make sense to have a 1K resistor feeding into the non-inverting input but since I didn't get a signal, I tried it the way I showed in the scheme. Perhaps my ground on the non-inverting input was poor. I'll give it another shot. Thanks again, I was racking my brain yesterday over this.

Hello. I'm very new to electronics and have myself in an odd situation. I'm trying to design a simple audio amplifier to drive a VU meter based on the 4739 dual opamp because I have a bunch of them. I've attached a crude scheme below. What's happening is I get an audio signal, but it's always unity gain regardless of the pot position. I know the amplifier is working because my first version ran on a 9V battery and the output was weak and distorted. When I switched to a +-12V power supply, the signal got stronger and clearer. If I touch anything in the feedback loop, I hear the interference. I tried reading about op amp design but from everything I've read, I should be getting 0-10x gain. Like I said, I'm pretty clueless so any help will be much appreciated.