Small Electret Microphone Pre-amplifier

Small Electret Microphone Pre-amplifier
The mic pre amp described here is designed to connect a small electret microphone and uses an integrated circuit type NE5532. As you can see, this scheme is very simple. The use of a dual operational amplifier type NE5532 is a large part in simplicity, although it was quite possible to simplify even more by using a single transistor. (more…)

Microphone Preamplifier based TLC251

Microphone Preamplifier based TLC251
Mic Preamplifier described here is designed for dynamic type microphones, the impedance between 200 ohms and 1 ohm. Its uniqueness lies in the low power consumption, no more than 30 uA in the "worst" case, and make it very portable for this, powered by 1.5 V battery which will allow for longer operating time. This scheme is based on records from the Texas Instruments application. (more…)