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microphone computer circuit schematic
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 transistor
find the output of capacitor microphone in theory or augur
Hello how can find the output of capacitor microphone in theory or augur it without test in? for example in these circuits what is the output of each..
Operational Amplifier Video Tutorial and super microphone circuit with LM324
Afroman goes over the basics of how to use an operational amplifier to amplify tiny voltages, and builds a circuit to listen to very faint sounds with a microphone. For more information about amplifiers, Google inverting amplifier non-inverting amplifier instrumentation amplifier class A amplifier class B amplifier class AB amplif
Simple condenser microphone mini audio amplifier circuit schematic
This is a very useful and simple circuit diagram for amplifying weak signal from a capacitive condenser microphone. You can use this circuit for sound sensing applications and some automatic robotic sensors. We have already posted an efficient audio amplifier circuit using 1895 IC, it is somewhat complicated and is suitable for very sensitive appl
electret microphone amplifier circuit diagram
portable microphone preamplifier circuit schematic
This circuit is mainly intended to provide common home stereo amplifiers with a microphone input. The battery supply is a good compromise: in this manner the input circuit is free from mains low frequency hum pick-up and connection to the amplifier is more simple, due to the absence of mains cable and power supply. Using a stereo microphone the...
Low-Noise Microphone Amplifier (OP270E)
The signal from a microphone is two weak for a standard line input. This low-noise DC-coupled microphone amplifier provides a solution for anyone who want..
Guitar Microphone Mixer Electronic Audio Kit for musicians
The mixer is really handy for DI`ing guitars and basses into soundcards or other mixers and making use of channels on mixes that do not have mike in`s, it comes in handy for one or two guitarists that want to sing and play through one guitar amplifier as well. The printed circuit board will not be exactly the same as the one in the pictures, it wi
Balanced Low Noise Microphone Preamp
This simple design has very low noise, close to the theoretical minimum, high hum rejection and variable gain with a single rotary pot. It is similar to that used in many professional grade mixing desks and can form the basis of a no compromise recording mixer for live work. The design consists of differential compound pairs of transistors with a
fm wireless microphone schematic
FM Wireless Microphone Schematic. In some applications, the use of the microphone cable is sometimes very difficultly. So use a cordless microphone is needed. Microphone as it is often referred to as wireless microphones (cordless microphone). Here I share wireless microphone circuit schematics using one transistor. Constructed using one bipolar t
Microphone preamplifier with audio compressor
3 input microphone preamplifier
The circuit given here is of a three input mic mixer cum preamplifier using the IC LM348. The LM348 is a high gain, internally compensated quad operational amplifier with a class AB output stage. The IC has very low input supply current drain (0. 6mA/ opamp) and operates from a dual power supply. Out of the four op-amps inside the IC LM348, IC1a, I
FM Wireless Microphone
Here is a very simple, inexpensive and interesting project which provides lot of fun to a home experimenter or hobbyist. This simple transmitter can transmit speech over a short range. It can be used as a simple cordless microphone. The circuit uses two integrated circuits from Maxim. IC1 a MAX4467, is an amplifier raising the microphone signal to
Microphones schematics and documents
The power supply was built into the base of the mic which can lead to hum issues despite the on-board potentiometer that acts as a `null`. This also means that the mic has two cables running from it - one for power and one for audio. Both mics use two-stage head amplifiers based around an ECC83 tube, and both have unbalanced outputs. Here are...
Lm318 Microphone preamplifier with tone control circuit and explanation
This electronic project is a simple microphone preamplifier based on the LM318 op amp. The LM318 op amp is operated as a standard non-inverting amplifier. Resistor R1 provides an input path to ground for the bias current of the non-inverting input. The combination of R2 and C2 provides a frequency roll-off below 30 Hz. At 30 Hz and above the gain
microphone Oktava MK 319
The MK-319 is a fixed cardioid-pattern, large-diaphragm condenser microphone. The capsule assembly is the same as the MK-219; the primary differences between the models are: The diaphragm is gold sputtered teflon, mounted to a center-terminated capsule design. The rear diaphragm is not sputtered. Both sides of the capsule are covered by a resonato
Low noise microphone amplifier circuit
This low noise microphone amplifier is build with MAT02 produced by PMI. This mic amplifier is very performant and has a verylow noise level. The amplification can be 20dB or 23. 5dB (10x or 15x ) selected by S1. We aim to transmit more information by carrying articles. Please send us an E-mail to wanghuali@hqew. net within 15 days if we are...
OP27 Fixed Gain Transformerless Microphone Preamplifier
A simple but effective fixed gain transformerless microphonepreamplifier circuit diagramin the picure below. The circuit amplifies differential signals from low impedance microphones by 50 dB and has an input impedance of 2 kOhms. The OP27/37 operational amplifierhelps to preserve bandwith because of the high working gain of the circui
audio Can I use a PNP Transistor with an Electret Microphone to get an non-inverting output for my Arduino
Read the generic sound level from an Electret Microphone. I`ve seen a number of schematics with NPN transistors, that will provide an inverted output (~5V when quiet, ~0V when loud, linear operation in between). However, I would like non-inverted output (linear operation, super quiet input gives ~0V, super loud input gives ~5V). I realize I...
Speaker Microphone Circuit
This circuits allows you to use a cheap loudspeaker as a microphone. Sound waves reaching the speaker cone cause fluctuations in the voice coil. The voice coil moving in the speakers magnetic field will produce a small electrical signal. The circuit is designed to be used with an operating voltage between 6 and 12 volts dc. The first transistor op
Microphone Amplifier / Modulator for 7 MHz SSB Transceiver
Microphone amplifier consists of LM324 and two transistors. LM324 is available in 14 pin DIP. I brought it for Rs: 6/-. It contains four identical operational amplifiers. Transistors BC548 and BC558 are used as compressor. I used 2-wire shield wire for connecting microphone. One wire is used for condenser microphone and the other for PTT switch....
An op-amp IC (741) amplifies the audio signal from MIC1, and R12 controls its gain. Audio is fed to the oscillator circuit Q1 and related components. D2 is a varactor diode. Audio fed to D2 causes FM of the oscillator signal. L1 is 1/2 turns of #18 wire on a He" diameter form. The antenna is a 12" whip.
Wireless microphone schematic
This wireless FM microphone is simple to build and it has a useful transmitting range (over 300 meters in the open air). Despite its small component count and a 3V operating voltage it will easily penetrate over three floors of an apartment building. It may be tuned anywhere in the FM band (87-108MHz) and its transmissions can be picked up on any
Simple condenser microphone circuit Schematic Diagram
The output of condenser mic is coupled via a coupling capacitor of 0. 1 µF, the purpose of this capacitor is to remove DC contents in the audio signal. Transistor Q1 is configured as collector to base biasing mode. This is accomplished via 470k © resistance. This resistor provides negative feedback to the transistor Q1. The output of Q1 becomes a
portable microphone preamplifier
This circuit is mainly intended to provide common home stereo amplifiers with a microphone input. The battery supply is a good compromise: in this manner the input circuit is free from mains low frequency hum pick-up and connection to the amplifier is more simple, due to the absence of mains cable and power supply..
microphone Neumann SM 69 fet
Both used a pair of capsules from Neumann`s K67 family, mounted one atop another, with the top capsule having the ability to be rotated 270 ° against the bottom (presumably, -90 ° +180 ° like the USM 69). The capsule is Neumann`s K870, a 34mm design with dual 26mm diaphragms made of gold-plated Mylar. The same capsule is used in the U87. Each ca
diy microphone preamp
Pre MIC (microphone preamplifier) 2 CH by IC NE5532 or LF353
This be Pre Mic circuit or Microphone preamplifier circuit model 2 CH. By this circuit uses integrated number circuit NE5532 or LF353. It perform enlarge sound signal from Dynamic Micro phone give the power goes up for subsequently submit to go to still stereo power amplifier circuit next. This circuit be of good quality good sound, because of use
Electret condenser microphone schematic
Electret Condenser Microphone Amplifier
Amplifier circuit for electret microphones (condenser microphones). Amplifier the audio signals picked up by the electret microphone, using 741 op-amp and a 2N2222 transistor..
Stereo Mixer for Microphone with 2 Channels
The circuit was designed to provide 2 channels on a stereo mixer that will be used for microphones while having a crossfader operation. NE5532 an intern..
Mic pre amp
Mic pre amp schematic based TLC251. TLC251 is a Programmable Low-Power Operational Amplifiers. This is indeed a control input, called BIAS (pin 8), which determines the mode of operation. When the pin is worn on the positive potential of power supply, the consumption of the circuit is reduced to a minimum, which is 10 uA (ten micro-amps).
Audio Filters Circuits
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Vacuum-Tube Valves Circuits
Musical & Effects Circuits
Ultrasonic distance finder circuit
The circuit described here uses ultrasonic oscillations and operates based on the propagation velocity of these oscillations in the air. Thus, we can easily determine the distance of two points if the time within which the wave travels this distance is measured. There are three main categories of distance measurement methods in use: a) By...
Simple Metal detector circuit with CD4030
Sometimes the precious metals are hidden too deep and are not detected except with complicated devices. In many cases, however, small pieces of precious metal buried near the surface can be detected by relatively simple means. Everyone is very attractive to find something potentially valuable, hidden a few centimeters below the soil. So many...
Fully automatic watering circuit for flower pots
Many times for various reasons we forget or can not water the plants that we have in our homes. And many humidity sensors units just notify us with a beeping sound or with a flashing light, that the pot needs watering. But what if we are away from home? This circuit comes as a solution to this problem. Depending on humidity of the pot at...
Simple deep searching metal detector circuit
The principle behind a metal detector is really very simple. Proof of this is the circuit that follows, in which it proves that the construction of a metal detector can be done in the minute, with few components that we find very easily everywhere. With the circuit of this metal detector, it is possible to detect a metal coin in depth of 90 to...
Sub-Harmonic Bass Converter for Electric Guitars
The sub-harmonic bass generator is a sound producing unit for guitars. The sound it produces looks very much like that of the bass guitar. The octave generator is sometimes quite unusual since it does not produce any of the usual ways of coloring the sound, such as filtering or distortion. Instead, a frequency division system produces outputs...
Echo Depth Sounding Sonar for Boats
In the past the sounding (sea bottom measurement) was done with the "bullet", that is, with a heavy lead object that the seamen plucked into the sea hung from a calibrated rope. As soon as the "bullet" reached the bottom, the depth appeared directly from the calibration of the rope. This arrangement still exists in some yachts. The big...
100W HiFi Audio Amplifier Circuit
This Amplifier was designed to have the following specifications: Distortion less than 0.1% at full power of 100W even at 20KHz. Power has to be attributed to an extended bandwidth. The output transistors must be protected against short circuits. The power supply must be symmetrical so that no electrolytic capacitors are needed at the outlet....
Plant-Pot Water Level Indicator Circuit
A series of LEDs serve to alert the gardener when plants need water. Using two conventional digital integrated LEDs and a series of LEDs, we make a very useful device for gardening. The device detects the amount of water in the pot and alerts the grower. The circuit of the device is shown in Figure 2. The water detection is made from the bottom...
Analogue Sound Preasure dB-Meter Circuit
The best human ear can capture sounds from 20Hz to 20KHz. These limits are known to be the broadest that can exist. Normally the normal limits range from 100Hz to about 13KHz and depend on the age and health of the individual. We for our measurements and to have a good accuracy we will get the limits of 20Hz to 20KHz. A sound to be heard does...
Digital Signal Integrity
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