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High Quality, Discrete Components Design, Input and Tone Control Modules To complement the 60 Watt MosFet Audio Amplifier a High Quality Preamplifier desi..
Passive RIAA Preamplifier
There are two types of preamplifiers for magnetic phono cartridges. An example of the most common type is the one described in the March 2002 issue of SIL..
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. Using a stereo microphone the ci
Preamp Stage For Ceramic Phono Cartridge Or Violin Pickups
While we have published a number of variations on a standard RIAA preamplifier for magnetic phono cartridges, we have not published a preamp stage for cer..
Dynamic Microphone Preamplifier using C945 transistor
It use the three transistor (2SC945, or 2C1815 or 2SC828) is main Which typical transistor amplifier with a low noise this circuit, too. There are about 200-300 times the gain. The frequency response is 50Hz to 100KHz. I have an old microphone, I want to make play with common amplifier. It does not sound much. Must to use pre amp before. I...
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
Simple Preamplifier by LM382
This be simple Preamp circuit. It can take sound general signal AUX and a signal from Microphone. For enlarge sound signal at the beginning. By use op-amp IC..
Simple preamplifier circuits by transistors
When you want to enlarge sound signal from all source before costume amplify. Usual use Pre Amplifier or Pre Amp. Today I begs for to suggest again the one circuit. That interesting because of use Transistor just one ( the number replaces many the number such as C1815 or C945 or C828, etc. ) The circuit easily and still be usable well. convenient
Three circuits of preamp tone controls by NE5532
A good quality preamp tone controls, a total of three circuits. We choose to use the NE5532 is main so interesting IC, because the ultra-low noise properties, it is commonly used in many fine audio. But these circuits are old. I have a circuits of friends. They has been small circuit with PCB layout. I hope them will be useful to you. good luck,...
some mic preamp vu meter
High gain microphone preamplifier electronic project
This microphone preamplifier electronic project is based on transistors and is capable of about 70dB or more gain at audio frequencies. Gain of this circuit is approximately equal to the product of the hfe of the both transistors times in the ratio of the load resistance to the input resistance of the preamp. As an approximation, these resistan
LM318 microphone preamplifier circuit design
This simple microphone preamplifier is 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 is relatively flat a
OP37 low noise microphone preamp circuit design electronic project
This microphone preamp schematic electronic circuit project is designed using the OP37 operational amplifier manufactured by Analog Devices and is effective, fixed-gain transformerless microphone preamp which amplifies differential signals from low impedance microphones by 50 dB, and has an input impedance of 2 k. Because of the high working gain
741 Stereo PreAmplifier
741 Stereo PreAmplifier Circuit Diagram This preamp circuit provides better than 20dB gain in each channel. PARTS LIST R1 -..
Automatic Gain Control Microphone PreAmp
This microphone preamplifier incorporates automatic gain control, which keeps the output level fairly constant over a wide range of input..
Automatic Gain Control Pre-Amplifier
A portion of the op amp`s output signal is rectified by the 1N4148 diodes, then filtered and fed to the gate of the FET input shunting circuit. As the output rises, more and more input shunting takes place. That is, more of the input signal is bypassed, effectively keeping the output level constant. The output output level itself can be set from l
Condenser Mike Pre-Amplifier Circuit
need often arises for a sensitive sound pick-up device, whether it is to be used as a simple microphone or a more exotic device as a sound operated alarm, a bugging device or a sound operated flash (for stop action photography) the list is quite unending. The circuit given employs a condenser microphone as the transducer. Since output of the conde
HeadPhone Amplifier OR PreAmplifier OutPut Stage
HeadPhone Amplifier OR PreAmplifier OutPut Stage This 1 watt amplifier lends itself par excellence for use as driver for low impedance headphone..
Low Noise Microphone Preamplifier Circuit
The microphone preamplifier circuit design presented in this schematic use SSM2015 produced by Precision Monolithics Inc. (PMI) which offers a high amplification and low noise ( 1. 3nV/ f). Has been designed to work with differential input signals and can deliver 10 to 2000x amplification and it is term of R4 value. For R5 = R6 the amplification
Class A Preamplifier Circuit
This class A preamplifier has been designed in a symmetrical structure. In the input differential stages we`ve used the dual transistors T1 and T2. Polarisation correction is essential because of the amplification differences and is assured with T12. P2 brings the output voltage to 0. For maximum performances, T7 and T9 surfaces must be in contact
Dynamic Mic Preamplifier Circuit
This mic preamp uses the low noise IC uA739. The circuit is an example of how a good preamplifier can be designed for dynamic microphones. The IC houses two identical integrated preamp circuits. The second preamp is used in identical manner for the second channel of the stereo microphone. The non-inverting input is biased at about 50% of the power
FET Preamplifier Circuit
Field Effect Transistor is an amplifying device in which the output current depends on the input voltage. The FET Pre Amplifier described here is a sensiti..
Low Voltage Microphone Preamplifier Circuit
This is a low voltage microphone preamplifier circuit with a 1. 5V power supply. The reference, with a 500 kHz unity-gain bandwidth, is used as a preamplifier with a gain of 100. Its output is fed through a gain-control potentiometer to the op amp, which is connected for a gain of 10. The combination gives a 60 dB gain with a 10 kHz bandwidth, unlo
Audio Preamplifiers Projects and Circuit
This Hi Fi stereo preamplifier circuit is built with TDA1054 IC from SGS. TDA1054 is a 16-pin DIL package and integrates 2 separate preamp circuits. It is a low noise preamp with little or no problem in the building process. The first half of the circuit (IC1a) it has an input sensitivity of 3 mV and has a frequency correction. Field Effect Transi
Band 2 Preamplifier
The circuit uses two 2N3819 FET`s in cascode configuration. The lower FET operates in common source mode, while the upper FET, operates in common gate, realising full high frequency gain. The bottom FET is tunable allowing a peak for a particular station. Coil details follow:
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
Band 2 Preamplifier
The lower FET operates in common source mode, while the upper FET, operates in common gate, realising full high frequency gain. The bottom FET is tunable allowing a peak for a particular station. Coil details follow:
Preamplifier with LA3161
Preamplifier with LA3161 Preamplifiers are used to amplify low level signals such as those from mikes, tape heads before they are fed into power amplifiers. Power amplifiers ar..
Sound Blaster Microphone Preamplifier
Circuit is based basically on quite well tested my simple microphone preamplifier. I have built one prototype of this circuit and it worked nicely. Soundblaster soundcard series (SB16, SB32, AWE32 and AWE64) have all a microphone input designed to be used with the electret microphones which come with the soundcard package (some pac
SW RF Pre-Amplifier
The problem with amplifying weak radio signals is that you also amplify the noise. What you can receive depends on how much background noise is present, whether it be man made interference or static. In this design the RF signal is first met by a resistive attenuator, this is necessary as strong signals could otherwise overload your receiver. The
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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...
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