The post details regarding a simple microphone (MIC) amplifier circuit which includes built in bass and treble control feature.
The active components of the circuit (amplifiers A1 and A2) proven in figure 1 are within IC1. A1 runs as a non-inverting amplifier along with the microphone input is given to pin 1 through coupling capacitor C1.
The amplification aspect of this stage depends upon the ratio of resistor R5 to the parallel combined R1 . . . R4. Along with R1 turned in, the amplification point is approximately 225, together with R3 moved in around 60, along with S1 in the middle location around 14. Since the efficient input level of sensitivity could be changed through S1, it may be aided to various input ranges or microphones.
The output of A1 is given to a tone control stage, A2. The proportion R13/R12 decides the amplification (around 18dB) in this stage.
The result of R11 and C6 is actually, in theory, much like that of R2 and C2: a smaller sized value of C6 raises the lower cut-off frequency. The RC system between A1 and A2 may be the actual tone control.
Potentiometer P1 fixes the bass level and P2 the treble level. Utilization is made from the attribute of capacitors performing as frequency centered resistances for ac voltages.
The output signal of the amplifier can be obtained to get link with the main amplifier through C9 and potentiometer P3.
This particular microphone amplifier circuit has not just already been tested in the Elektor laboratories but additionally from the designer in the course of browsing on-stage tests. A printed circuit board with this low noise amplifier can be obtained. lt is extremely narrow to allow it to be applied as an input module within a mixer.