[sdiy] DIY Mixer - please help!

[Antti Huovilainen]

On Thu, 3 Sep 2009, Chris Muir wrote:

> I don't know mixer circuits well, but in most synth circuits I've taken 
> the time to understand, the source impedance is an order of magnitude 
> (or three) lower than the input impedance.

Mixer or no mixer, you want voltage transfer. "Matching impedance" is a 
holdover from telephone circuits and tube power amplifiers where you want 
to maximize power transfer. It has no place in normal audio circuits. 
Certainly not in a mixer. Some mixers have selectable input impedance for 
mic preamps, but that's just to change the frequency response of certain 
not so ideally designed microphones.

Antti

"No boom today. Boom tomorrow. There's always a boom tomorrow"
   -- Lt. Cmdr. Ivanova