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Simple Microphone Design For Computer

2015-01-12 18:21  
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Figure 1 

The circuit diagram illustrates the creation of a plain microphone setup using two resistors to produce an aggregate amplifier, designed for use in computers.

A microphone, originally created by Emile Berliner, is a device that permits voice and sound recording generated from a computer. Applications such as a voice dictation program or a voice conference program are dependent on microphones.

The design of the circuit was referenced to the computer audio card which in general contains a microphone input, speaker output and sometimes line inputs and outputs. A scope of 200 to 600 ohms impedance for dynamic microphones are considered in the construction of the circuit.

Both transistors, BC413B and BC547C are silicon epitaxial planarNPNtransistors. They are small load switch transistors with high gain and low saturation voltage. Well suitable for TV and home appliance equipment. To give a minor lift to the microphone signal, the BC413B should conduct on the common emitter pin while the BC547C conducts on the emitter follower phase. The procedure is essential to guarantee the least noise interference and absorb orderly signal by placing the battery, circuit and microphone far from the audio card.

In picking out computer microphones, consider the frequency response (100 Hz to 8 KHz minimum), unidirectional and if it comes with a headset, a stereo headset.

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


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