Showing posts with label microphone. Show all posts
Showing posts with label microphone. Show all posts
Tuesday, December 24, 2013
Wireless transmitter microphone circuit
Wireless FM transmitter circuit Microphone Hi Fi using a model-ready transmitters, this is because the buil-up transmitter module has a transmission capability of a stable and very effective to emit 10 mW RF. so that the target of Hi Fi FM Wireless Microphone transmitter circuit Hi Fi can be realized. The series can be seen from the FM transmitter Microphone Wireless Hi Fi transmitter module is that it stands alone with an additional R7, R8 and C6 to produce high-quality RF frequency.
In the series of FM transmitter Microphone Wireless Hi Fi module requires power consumption of a battery 12 VDC. Transmission antenna is directly connected with the circuit module Wireless FM transmitter Wireless FM Microphone Hi Fi.
Input section of the circuit transmitter Wireless FM Microphone Hi Fi signals to the modulation of 100mV RMS. A microphone preamplifier with IC TL081 is used to reproduce the signal from the microphone into a signal with 100mV rms level as needed this wireless FM transmitter module. strengthening the signal from the microphone preamplifier circuit in FM transmitter Microphone Wireless Hi Fiini regulated by P1. R1, R2 and C1 in the range of an FM transmitter Microphone Wireless Hi Fi is used to provide supply to the microphone electred used.
Sunday, December 22, 2013
Microphone Amplifier using MAT02
This microphone amplifier circuit electronic project is designed using MAT02 dual monolithic transistor and few passive electronic components .This microphone amplifier circuit allow use of microphones with different impedance and provides a voltage gain of 20 dB and 23.5 dB (amplification 10 and 15), selectable from a switch. Preamplifier has two stages with direct coupling and reaction, and the input stage operates at very low collector current to minimize the noise.
Output impedance is approximately 70 ohms at a gain of 23.5 dB. Low power consumption (approx. 2.5 mA) and power from a 9V battery make it ideal for portable applications. Since the resistor R3 is responsible for input impedance and a few other important features of preamplifier, with R3 = 220 k, the input impedance is 30 k. Change the value of R3 to 6.8 k input impedance dropped to about 1 k.
Wednesday, December 11, 2013
Low Noise Microphone preamplifier
This circuit use to raise the gain to reduce noise or amplify the signal. And this circuit use IC OP27 / OP37 , this is precision opertional amplifier ,lower noise , and higher speed with the same input ofset with drift specifications as the OP07 . Both parts have a 10 uV offset , 0.2 uV drift , and 1.8 million gain. Coupled with low voltage noise of 3.5 nV at 10 Hz and a low 1 /f noise corner frequency of 2.7 Hz, the OP27 / OP37 are optimized for accurate amplification of low - level signal.
See schematic and pin configuration below :
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| Click to view Larger |
Output swing about 10 V into 600 Ohm. Input voltage maximum 25 V. This circuit also can use to , Low noise DC amplifiers , Microphone Amplifiers , Precision Amplifier , Tape - Head Preamplifiers , Termocouple Amplfiers , Low - level Signal Processing , Medical instrumentation m Strain - gauge Amplifiers , High accuracy Data Acquistion.
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