Pre-MIC | Electronic Project Circuits

Posts Tagged ‘Pre-MIC’

Simple microphone preamplifier by BC547

This is a simple microphone preamplifier circuit which you can use between your microphone and stereo amplifier. This circuit amplifier microphone suitable for use with normal home stereo amplifier line/CD/aux/tape inputs. This microphone preamplifier can take both dynamic and electret microphone inputs (preamplifier provides power foe electret microphone elements). The idea of this circuit is to keep the design as simple as possible to be easy to build. That was my goal when I needed a simple external microphone preamplifier for my mixer. The performance of the circuit is nothing superior but can be used with many not so serious projects.

Read More Source: http://www.tkk.fi/Misc/Electronics/circuits/micamp.html Thank you.

Be the first to comment - What do you think? Posted by admin - November 15, 2007 at 9:00 pm

Categories: Pre Amplifier Tags: BC547, Portable Microphone Preamp, Pre-MIC

Computer Microphone by BC547

Notes:
This circuit was submitted by Lazar Pancic from Yugoslavia. The sound card for a PC generally has a microphone input, speaker output and sometimes line inputs and outputs. The mic input is designed for dynamic microphones only in impedance range of 200 to 600 ohms. Lazar has adapted the sound card to use a common electret microphone using this circuit. He has made a composite amplifier using two transistors. The BC413B operates in common emitter to give a slight boost to the mic signal. This is followed by an emitter follower stage using the BC547C. This is necessary as the mic and circuit and battery will be some distance from the sound card, the low output impedance of the circuit and screened cable ensuring a clean signal with minimum noise pickup.

Source :: http://www.zen22142.zen.co.uk/Circuits/Audio/compmic.html