Help please - mic preamp/mixer
Moving along, I've made changes as advised...I think. New schematic attached.
Although it scares me, I fooled with audioguru's sticky schematic. This because I didn't know how to connect multiple amplification stages, so I went with additional information from Charles Kitchin, who seems to be known figure. Here's his article:
https://www.electro-tech-online.com/custompdfs/2011/01/avoiding.pdf
Although I didn't/don't want to take up anybody's time with unnecessary details, maybe some brief clarification is in order.
This is all an attempt on my part to solve two problems:
First: I think I need a higher audio input level to my computer to keep Audacity happy. Possibly because, by choice, I run my motherboard's onboard audio, i.e. no sound card.
Second: Actually more important, WindowsXP already has most of what's needed for making recordings, but once you start trying to do some actual work it gets to be a pain of monumental proportions to click through what seems like 1,000 windows to adjust inputs or levels.
Then add in switching between speakers and headphones...by replugging in the back of the computer. Things get irritating.
So my solution is to bypass Windows entirely. Set the computer's audio levels once and then leave them alone, passing control to the planned preamp and mixer. And also to a switched speaker/headphone output, but I think I have that figured out from surfing these forums.
And as before, the computer's microphone jack is no longer to be used. All input to the computer will be through its line-in jack.
As far as I can tell, a level of about 1-volt is expected at preamp or line-in terminals, so that's my planned input to the computer's line-in jack. If I'm anywhere near the correct levels in my planning, the 3 preamp level controls (mic, line, master-out) will take care of the details...hopefully.
Whew. Such is the plan. And thanks again for you help.
-al-