Simple mixer circuit – Common base

The simple mixer schematic is built on common base principle, where input voltages are transformed in alternative currents wich are summed to form the alternative current component for the collector. The total amplification is R6 - Ri, where Ri is one of the input resistors. I’ve build this mixer for a little transmitter and works great.

Simple mixer circuit – Common base

Simple mixer circuit – Common base
source :http://electroschematics.com