Microphone Ecm
amplifier circuit for electret condenser microphone
An amplifier circuit for an electret condenser microphone includes an amplifier operational, an operational amplifier, a bias circuit and a power circuit. The operational amplifier has an inverting input for receiving output of one to two driving son electret condenser microphone and a noninverting input for receiving a bias voltage. The bias circuit divides a supply voltage to the bias voltage to generate. The circuit, the voltage of the electret condenser microphone through the bias circuit and a first resistance.
condenser microphone, and construction is well known. The microphone consists a cup-shaped housing with a base and an outer vertical wall. The wall ends at an outer edge of an opening. The microphone was also a membrane assembly and the ring applied to the prepared surface with a peripheral edge, a rear plate with an edge device and a spacer arranged between the membrane and ring assembly and the rear plate to separate the membrane and the support from the backplate. The microphone is also a substrate close to opening the case. The spacer between the housing wall and the peripheral outer edges of the membrane and all ring and back plate arranged. The spacer has a radially inward-flange which engages a peripheral upper surface of the backplate.
In the bottom of this ECM, the parties are placed in an aluminum housing, or can. Due to safety concerns can not part parts can be properly centered within, and this results in the active part of the membrane of movable contact elements which are not expected feel the influence of such a negative effect resulting performance and production.
The main problem is that the upper ECM as closed boxes are rolled at the top. The forces used for the role microphone closed and sealed to be very large, and this force is, however, all parts transferred. All ECM product using the Teflon FEP "somewhere in their design to maintain the charge electrostatic. Sometimes it is used as the mobile screen and it is sometimes used to coat the back plate. But Teflon is soft, and the strength of rolling and sealing, it is distorted and changed his strength. Since the thickness changes, performance and the performance of the microphone are variations in the critical space between the flap and the back plate.
According to this aspect of the invention, the method is to provide a cup-shaped housing with a base and an outer vertical wall. The Wall ends at an outer edge of an opening. The method also includes the insertion of a diaphragm assembly and the ring on the ground. The diaphragm and a ring surrounding Edge. The method also placing a spacer on the peripheral edge of the membrane assembly and the ring by a back plate on the block, the back plate with a peripheral Edge, and place a spacer between the housing wall and the peripheral outer edges of the membrane and the ring assembly and the back plate of the spacer with an upper surface. The method also includes placing a substrate in the case open and the top spacer and rolling engagement distal edge housing with the substrate to seal the microphone. The spacer transmits the rolling force of the substrate to the housing base.
condenser microphones this type consist of a membrane-electrode placed below the diaphragm, back-formation chamber plate under the rear electrode is arranged, a circuit assembly sub-plate chamber butter plate forming a plurality of electronic circuit including a preamplifier located the upper surface of the circuit mounting plate, and a space between the electrode and back behind the plate forming chamber forming chamber surprise.
These classic condenser microphone can obtain advantageous properties of the optimal frequency response of the microphone, since the back-formation chamber plate ready allowed the distance between the electrode and butter plate-forming chamber, ie the ability to appeal dismissed, be modified freely.
On the other hand, however, that the microphones are condenser microphone is defective complicated structure.
The electronic circuit elements are that the bottom surface of the circuit board soldered to circuit elements such electronics are not appropriate. Weld bottom surface is not active towards the electrode microphone or butter, but after the outside with respect to the microphone. Thus, such a surface weld less susceptible to negative influences from outside noise, and should therefore be covered with a shield.
Therefore, in addition to the chamber back plate is a shield is absolutely necessary to avoid reduce the increase in number of members constituting a microphone.
condenser microphones are other species in the disc back room training in the conventional capacitor microphone above mentioned, is known eliminated.
In such a condenser microphone, the rear compartment, cons between the electrode and the circuit is formed. For example, a condenser microphone advantageously constructed in such a way that does not require disk butter-room-forming. But because of the presence of electronic components, the distance between the electrode and the circuit can not be less at a predetermined distance so that the capacity of the rear chamber can not be less than a predetermined value. It is a case where the optimal characteristics of the frequency response of the microphone can not be obtained.
In addition, as a condenser microphone mandatory to have a shield so that the reduction in the number of members representing the microphone and microphone simplification of the structure can not be achieved.
About the Author
Ningbo Tongxin Microphones offers the best variety of quality Condenser Microphone for Studio, Podcast, USB, Instrumen, Conference, Broadcast and Field Recording.
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