Simple-mixer


Posted on May 1, 2012

This mixer is built around a TL072 dual BiFET op amp with a JFET input stage, and can be powered from a single-ended 9-to 18-V power supply. The microphone input is capacitively coupled to the noninverting input of U1a. Resistors R1 and R3 set the voltage gain at about 26 dB and serve as a negative feedback network for U1a. Capacitors C1 through C3 are de-blocking capacitors. Most high-impedance microphones have outputs of a few mV.


Simple-mixer
Click here to download the full size of the above Circuit.

Often, a preamp stage just isn"t enough, so the microphone signal· is given a boost of about 20 db in the mixer. The noninverting input of U1b is biased to half the supply voltage by R6, R7, and C6. Resistors R5 and R8 make up the negative-feedback network and set the voltage gain of U1b at unity. Capacitor C5 is for de blocking at this input.




Leave Comment

characters left:

New Circuits

.

 


Popular Circuits

Mains Delay Switch For Lambs and Motors
Touch detecting Switches
Robot eyes
Simple voltage controlled oscillator
Vcr Tv On-Off Control Circuit
jet engine sound generator
Microcontroller driven LCD panel with voltage measurement time EEPROM for computers
6V 9V adjustable flow circuit



Top