Welcome back to free circuit dot com ,today we have amplifier for microphone with transistor number BC549,BC547 for drive signal. As this is a simple microphone preamplifier circuit between microphone and stereo amplifier can be used. The circuit amplifier microphone suitable for use with a normal stereo amplifier line / CD / aux / tape inputs. The microphone preamplifier can be both dynamic and electret microphone inputs (preamplifier provides foe electret microphone elements). The idea of this circuit is provided that the design as easy as possible for easy build. Which was my goal when I make a simple external microphone preamplifier for my mixer needed. The behavior of the circuit is nothing better, but with many not so serious projects are used.