Microphone Circuits

This circuit operates from..

Views: 2070 | Votes: 78 | Comments: 0 | Rating: 1 | Rank: 5 | Added: Mar 19, 2013 |

A microphone preamplifier using: om CMOS op amp with its own battery, is small enough to be placed in a case of small microphone. The amplifier operates from a 1.5V battery cathode mercury low supply currents. This preamp will operate at very low power and maintain a reasonable frequency response as well. The TLC251 is operating in low bias (operating at 1.5 V) draws a supply current of only 10 and has a year - frequency response of 3 dB 27 Hz to 4.8 kHz. With 8-pin.....

It is possible to simulate the balanced performance of a transformer electronically with a different amplifier. By adjusting the presets, the resistor ratio can be balanced so that the best CMRR is obtained. It is possible to get a better CMRR than from a transformer..

Views: 3468 | Votes: 95 | Comments: 0 | Rating: 2 | Rank: 5 | Added: Mar 6, 2013 |

This circuit features the ZTX450/ZTX550 transistors in a push-pull output stage. The following readings were taken at maximum volume: Input: 0.4 mV rms, Output: 1.8 V rms, Voltage gain: 4500, Max. output before distortion: 2.25 V rms -supply current ~ 3.5 mA, Zero output-supply current: 3.5 mA, ..

Views: 39 | Votes: 12 | Comments: 0 | Rating: 2 | Rank: 5 | Added: Jan 22, 2013 |

An ultra low noise audio preamplifier particularly suited to microphone preamplification including balanced microphones. The IC features wide bandwidth, low distortion only 0.007% at a gain of 100, ..

Views: 3223 | Votes: 9 | Comments: 0 | Rating: 9 | Rank: 10 | Added: Oct 26, 2012 |

This circuit is suitable for using an electret microphone for many applications. A 1.5-V battery is used. CI and R3provide treble boost/bass cut;..

Views: 66 | Votes: 11 | Comments: 0 | Rating: 9 | Rank: 5 | Added: Oct 8, 2012 |

This circuit is used to interface a high-impedance microphone to a radio transceiver that requires a low-impedance microp..

Views: 38 | Votes: 68 | Comments: 0 | Rating: 5 | Rank: 5 | Added: Jul 11, 2012 |

A current source (MPF102) in the source lead of bipolar transistor 2N3906 permits accurate control..

Views: 26 | Votes: 7 | Comments: 0 | Rating: 4 | Rank: 5 | Added: Jun 5, 2012 |

This preamp uses a small dynamic microphone coupled to the gate of Ql. R1 is a load resistor. Audio is taken out b..

Views: 46 | Votes: 91 | Comments: 0 | Rating: 3 | Rank: 5 | Added: May 30, 2012 |

A JFET transistor-is used as a high-to-low impedance converter and signal mixer. Input impedance is approximately 50.0 kQ but it can be increased by increasing R5 to R8 as high as 10 . Output is about 2 kQ, but it can be increased or decreased by changing the value of i10...

Views: 27 | Votes: 65 | Comments: 0 | Rating: 1 | Rank: 5 | Added: Apr 20, 2012 |

This is a nice example circuit that can be used at parties. The four LEDs blink to the beat of the music. The light organ using a microphone responds to sound. T1 amplifies the signal from MIC. The sensitivity can be adjusted with P1. T4 controls the LEDs. These are preferably high intensity LEDs. ..

It`s a simple matter to determine the absolute polarity of most studio equipment using an oscilloscope. By feeding a pulse wave into the device and monitoring the input and output signals simultaneously, you can quickly see if the polarity is the same or reversed...

If you've crossed the line and play guitar or bass and also sing in a band, you're almost certain to have run into the situation that you step away from the mike to do a solo (or one of those neato, expressive dance steps, or a facial impression of the pain you're pouring out to make these dulcet tones...), and had the mike pick up some unfortunate noise to funnel into the PA. You may even have fumbled for the mike mute switch as you stepped away and back to it, but that's.....

I have found this circuit to have better sensitivity, both in distance to a visible bat and in audio frequency, than some other published circuits using a 40kHz transducer with 4000x gain amplification, though the 40kHz transducer I used for the comparison may have a bearing on these results. The high-pass filter is included purely to help eliminate the circuit being triggered by ambient noise. The filter is a 4-pole Chebychev with a very steep roll-off below 15kHz. There.....

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The circuit is a simple one transistor amplifier with amplification of about 30-40 dB (depends on transitor, temperature and voltage). The dynamic mic input is just a simple one transistor amplifier circuit with nothing special. This is a simple microphone preamplifer 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 is a 3 stage discrete amplifier with gain control. Alternative transistors such as BC109C, BC548, BC549, BC549C may be used with little change in performance. The first stage built around Q1 operates in common base configuration. This is unusuable in audio stages, but in this case, it allows Q1 to operate at low noise levels and improves overall signal to noise ratio. Q2 and Q3 form a direct coupled amplifier, similar to my earlier mic preamp...

The circuit is a microphone amplifier for use with low impedance (~200 ohm) microphones. It will work with stabilized voltages between 9-30VDC. If you don`t build the impedance adapter part with T1, you get a micamp for higher impedance microphones. In this case, you should directly connect the signal to C7...

For wiring to the microphones I used a wiring harness from an old portable headphone set. Find one with a 90 degree miniplug if possible. Cut off the headphones, solder the condensor mics to the leads and voila. Anything larger than the pencil soldering irons will be cumbersome. Tin the wires first, clamp the capsule in something, hold the wires with tweezers, melt the solder tabs while pressing the tinned leads into them...

Sometimes there is need to convert line level signals to such signal that it can be connected to microphone input. Because the line level signals are typically in range of 0.5..2V and the microphone signals are in millivolt range, quite much attenuation is needed to match the signal levels. This means that typically you will need 40-50 dB of attenuation...