4-Channel Mixer

Posted on Aug 15, 2012

The proposed mixer is designed around four current-driven transconductance amplifiers contained in an SSM2024 from Precisio

4-Channel Mixer
Click here to download the full size of the above Circuit.

n Monolithics. To obtain a low offset and high control rejection, the four inputs should have an impedance to earth of about 200 . These impedances are obtained from resistors R5 through R8, which also form part of a potential divider at each input. With the values in the diagram, the nominal input signal is 1V (0 dBV). Distortion at that level is about 1%; at lower levels, it is not more than 0.3%. The amplification of the current-driven amplifiers (CDAs) is determined by the current fed into the control inputs. These inputs form a virtual earth so that calculating the values of the bias resistors (to transform the inputs into voltage-driven inputs) is fairly simple. The output currents of the amplifier are summed by simply linking the output pins. The current-to-voltage converter, IC2, translates the combined output currents into an output voltage. The value of R13 ensures that the amplification of IC2 is unity.

Leave Comment

characters left:

New Circuits



Popular Circuits

Periodic Timer
Remote flash trigger
Flash Signal Alarm Circuit
A Simple Metal Detector Circuit Using Beat Frequency Oscillator (BFO)
pH Sensors LMP91200 Schematic Diagram
00 to 99 minute timer using PIC16F628A microcontroller
Digital thermometer circuit based on CA3162 CA3162 and LM35
Radio Circuits
Car Headlights Timer Circuit Schematic
Phonograph amplifier circuit diagram