Building a Passive Audio Mixer

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80hinhiding said:
Transistor based preamp
https://www.youtube.com/watch?v=0L9GJqMfWUA

I was going to try this circuit and tweak it to see what happens.  Jakob, maybe you can advise how it could be made better without getting too complex that it's over my head?

The circuits you have posted Youtube links to are all very simple. Ideal for learning the basics of electronics design but not for high quality audio. I would recommend you turn your attention to integrated circuit based designs and especially to op amp audio circuits. The most commonly used audio op amps are probably are the NE5532 and the TL072.

Cheers

Ian
 
Tim of Buzz Audio and Gustav had created the "Majestic Buzz" a few years ago that member Forth Monkey has decided to recreate and play with:

http://groupdiy.com/index.php?topic=63926.0

 
Both your one-transistor drawings are missing connections at the Base.

Corrected, they are a LOT like the "LPB", an early (yet still popular) guitar amp booster.
https://hotbottles.files.wordpress.com/2012/02/lpb-schematic.png
I'm sure it can be a mike(?) preamp.

Your 2-tranny plan looks like student homework. Two of the same thing tacked together. They *are*  scaled (2nd stage runs 2X the current of the first stage). Kinda spoiled by the 10K pot on the end. Huge jump-up from 560r, and comes too late to avoid distortion on large inputs.

Somewhere along your path, you may find that if you have two transistors you can probably do better direct-coupled than cap-coupled. (Exception for 1959 Ge devices of very uncertain leakage.)
 
>   Is there such a thing as a bad switch

Yes, yes, yes.

A bad switch is an annoyance on my tractor lights.

A bad switch is an artistic disaster when live recording fine musicians.
 

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