Microphone preamplifier with TLC251

Posted on Mar 16, 2013

A microphone preamplifier using: om CMOS op amp with its own battery, is small enough to be placed in a case of small microphone. The amplifier operates from a 1.5V battery cathode mercury low supply currents. This preamp will operate at very low power and maintain a reasonable frequency response as well. The TLC251 is operating in low bias (operating at 1.5 V) draws a supply current of only 10 and has a year - frequency response of 3 dB 27 Hz to 4.8 kHz. With 8-pin grounded, which is designated as the polarization state high limit increases above 25 kHz.

Microphone preamplifier with TLC251 - image 1
Click here to download the full size of the above Image.

Supply current is only - 30 pA under these conditions.

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