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You did not make a mic preamp since you didn't use a mic. You made a line-level preamp that was driven from an MP3 player. Its small-value input capacitor (or its low input impedance) reduced its bass response.i used the non inverting config for the mic preamplifier and it worked perfectly well.... thnx for the info.... thnx very much....![]()
The preamp circuit will drive a load of 2k ohms or more. But since the TL074 has very high frequency response, it oscillates if it directly drives the capacitance of a shielded audio cable. A 100 ohm resistor in series with its output will isolate the capacitance of the cable from the opamp so it does not oscillate.I placed my potentiometer at the input side. I had some trouble summing up 3 audio preamplfiers with volume controls at the output side.
I placed my potentiometer at the input side. I had some trouble summing up 3 audio preamplfiers with volume controls at the output side.