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EC_-_I_IMPORTANT_QUESTIONS_86623 - e
EC_-_I_IMPORTANT_QUESTIONS_86623 - e

... 10. How does a transistor width-to-length ratio affect the small signal voltage gain of a common source amplifier? 11. How a MOSFET can be used to amplify a time varying voltage? 12. How does body effect change the small signal equivalent of the MOSFET? 13. Why in general the magnitude of the voltag ...
Roberto Pugliese works selection
Roberto Pugliese works selection

... the principle), also known as acoustic feedback, is the typical shrill whistle that develops when the sounds emitted from a loudspeaker is received back with sufficient "power booster" by a microphone (or pickup of any electric musical instrument, like a guitar or bass) and sent it back to the same ...
SPECTRA SONICS MODEL 101 AUDIO AMPLIFIER Operating
SPECTRA SONICS MODEL 101 AUDIO AMPLIFIER Operating

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Marine Amplifier
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A Broadband HF Amplifier Using Low-Cost Power MOSFETs
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... amplifier resulted in oscillations that destroyed one of the IRF510s. I was puzzled by this. At first, I thought the problem was caused by my substitution of the slightly more robust IRF510 MOSFETs for the called-for IRF511s. That idea proved wrong when my second attempt to power up the amplifier wi ...
Cinénova Grande - earthquakedenmark.dk
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LM148/LM248/LM348 Quad 741 Op AmpsLM149 Wide Band
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Lecture 10: Differential Amplifiers
Lecture 10: Differential Amplifiers

... Op amps are an important component of modern CMOS IC’s. They used to designed as general purpose amplifiers that can meet a variety of requirements. The main target was extremely high gain (>1e5), high input impedance and low output impedance (like an ideal amplifier). This was done (to some extent) ...
A differential electrometer for vector electric field
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... probe technique on platforms like balloons and rockets. High impedances (up to 1013 ohms) and low signal levels (~few millivolts) are the factors that are to be considered in the design of an electrometer for one such experiment. Here, we offer a simple circuit concept that invokes an instrumentatio ...
Amplifier Anatomy - Part 1
Amplifier Anatomy - Part 1

... Another concern with power supplies is regulation: the ability to hold the dc supply voltage constant, despite changes in amplifier loading or ac voltage. The first characteristic is called load regulation, or sometimes power-supply stiffness, and basically depends on the resistance in the transform ...
Concourse Sound System Handbook
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... Op amps come in “chip” form. They are made up of complex circuits with 20-100 transistors. Ideal Op Amp Real Op Amp µA741 Voltage gain (open loop) ...
Lecture 7: Hybrid Transistor Model for small AC :
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... Op amps come in “chip” form. They are made up of complex circuits with 20-100 transistors. Ideal Op Amp Real Op Amp µA741 Voltage gain (open loop) ...
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... • Two filters provided – one for video, one for audio. • Both tune to 2304, use one for xmit- one rx • 1.7 dB I/L ...
65 AMPSSoHo USER GUIDE
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... completely hand-wired with the highest quality and select choice transformers, components and speakers. GENERAL DESCRIPTION OF THE 65-SoHo AND ITS CONTROLS: The 65-SoHo utilizes the EF86 tube on the input then feeds into a 12AX7/ECC83 driven tone stage with BASS and TREBLE tone controls. There is a ...
inti-illimani copy
inti-illimani copy

... The group has appeared on Amnesty International stages with Peter Gabriel, Bruce Springsteen, Mercedes Sosa, Sting, and Wynton Marsalis, and at benefit concerts for the Victor Jara Foundation (London, Dortmund, Glasgow) with Peter Gabriel, Paco Peña, John Williams, Emma Thompson, Karen Matheson, Mar ...
Here - audioXpress
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... You might ask what type of signal is best suited for burn-in. Music is one obvious candidate, but what type: vocals, percussion, organ, or rock-and-roll? Clearly, a full-range signal containing both high and low frequencies is desirable, particularly one with transient information. The signal should ...
[PDF]
[PDF]

... The proposed offset cancellation circuit contains the proposed two-stage buffer amplifier, shown in Fig. 1, consists of 1) four transconductance amplifiers, TCA1, TCA2, TCA3, and TCA4, 2) two transimpedance amplifiers, R1 and R2; and 3) a pair of common-source amplifiers, A20 and A21. The four trans ...
AN-589: Ways to Optimize the Performance of a Difference Amplifier
AN-589: Ways to Optimize the Performance of a Difference Amplifier

... There are times when a small signal needs to be measured in the presence of a large common-mode signal. Traditional instrumentation amplifiers (in-amps) that have two op amp or three op amp internal configurations are commonly used in these applications. Although in-amps have good common-mode reject ...
LM148/LM248/LM348 Quad 741 Op Amps LM149 Wide Band
LM148/LM248/LM348 Quad 741 Op Amps LM149 Wide Band

... each amplifier is adjacent to its output. In addition, the amplifier outputs are located in the corners of the package which simplifies PC board layout and minimizes package related capacitive coupling between amplifiers. The input characteristics of these amplifiers allow differential input voltage ...
Circuits with Transistors Contents 1 Transistors
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... output characteristics in effect gives us a graphical solution to two simultaneous equations: one equation, belonging to the transistor, non-linear equation given by the family of IC −V CE graphs, and the other the load line. The intersection points show the possible values that may exist in the cir ...
Danger: Low Power - JBL Professional
Danger: Low Power - JBL Professional

... We occasionally hear of JBL owners whq damage the high frequency components of their loudspeaker systems using amplifiers that are rated at less- rather than more- power output than recommended. Understandably, they often find It difficult to comprehend how such an amplifier can actually burn out JB ...
RSGB Review of ACOM 1000 and ACOM 2000A
RSGB Review of ACOM 1000 and ACOM 2000A

... amplifier for 1 kW output and covering all HF bands plus 6m. I was particularly pleased to obtain the first production sample for review. Although Acom amplifiers have been available for only a couple of years, the fruits of its handiwork have been visible for much longer in the Alpha 91b, which was ...
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Instrument amplifier



An instrument amplifier is an electronic amplifier that converts the often barely audible or purely electronic signal from musical instruments such as an electric guitar, an electric bass, or an electric keyboard into an electronic signal capable of driving a loudspeaker that can be heard by the performers and audience. Combination (""combo"") amplifiers include a preamplifier, a power amplifier, tone controls, and one or more speakers in a cabinet, a housing usually made of hardwood, plywood, particleboard, or, less commonly, moulded plastic. Instrument amplifiers for some instruments are also available without an internal speaker; these amplifiers, called ""heads"", have to be plugged into an external speaker cabinet. Instrument amplifiers are available for specific instruments, including the electric guitar, electric bass, electric keyboards, and acoustic instruments such as the mandolin and banjo. Some amplifiers are designed for specific styles of music, such as the ""traditional""-style ""tweed"" guitar amplifiers used by blues and country musicians, and the Marshall amplifiers used by hard rock and heavy metal bands.Unlike home ""hi-fi"" amplifiers or public address systems, which are designed to reproduce accurately the source sound signals with as little harmonic distortion as possible, instrument amplifiers are often designed to add additional tonal coloration to the original signal or emphasize (or de-emphasize) certain frequencies. The two exceptions are keyboard amplifiers and ""acoustic"" instrument amplifiers, which typically aim for a relatively flat frequency response.
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