This low noise microphone amplifier is build with MAT02 produced by PMI. This mic amplifier is very performant and has a verylow noise level. The amplification can be 20dB or 23. 5dB (10x or 15x ) selected by S1. We aim to transmit more information by carrying articles. Please send us an E-mail to wanghuali@hqew. net within 15 days if we are involve
d in the problems of article content, copyright or other problems. We will delete it soon.