Looking for a wiring diagram for rear bose 975 powered speakers. ....etc

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Working of telescopic cascode differential amplifier using MOSFETs with its circuit diagram ....etc

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Self cascode :A promising low voltage
Analog design techique

Submitted by-
RAMSHANKAR KUMAR
S7,ECE,
DOE,CUSAT


WHY CASCODE BETTER?

IT IS A SINGLE STAGE AMPLIFIER WITH GAIN ENHANCEMENT.
WHILE A CASCADE IS TWO STAGE AMPLIFIER.
IT HAS SINGLE NODE IS AT HIGHER IMPEDENCE,WHERE GAIN IS REALIZED.
IN THIS GBW IS DETERMINED BY INPUT TRANSCONDUCTANCE AND LOAD CAPACITANCE.

Cascode and cascade amplifier

Cascode amplifier is a one stage amplifier with gain enhancement at low frequencies.
It has one ....etc

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Cascode amplifier
An amplifier stage consisting of a common-emitter transistor cascaded with a common-base transistor (see illustration). The common-emitter-common-base (CE-CB) transistor pair constitutes a multiple active device which essentially corresponds to a common-emitter stage with improved high-frequency performance. In monolithic integrated-circuit design the use of such active compound devices is much more economical than in discrete designs. A similar compound device is the common-collector-common-emitter ....etc

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Common Emitter BJT Amplifier Design Current Mirror Design


Some Random Observations
Conditions for stabilized voltage source biasing
Emitter resistance, RE, is needed.
Base voltage source will have finite resistance, RB.
needs to be much larger than RB.
Small RB - relative to RS - will attenuate input signal.
Larger RE permits larger RB, but results in lower gain.
Gain = -RC/RE for RE >> re.
Split RE with bypassing increases gain.
Requires large bypass cap ....etc

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mode of operation of a telephone amplifier.it uses an LM386 which amplifies the signal coming into the telephone inorder to increase the volume
....etc

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PHOTOTRANSISTOR A LEAP OF OPTOELECTRONICS

Like diodes, all transistors are light-sensitive. Phototransistors are designed specifically to take advantage of this fact .the most-common variant is an NPN bipolar transistor with an exposed base region. Here, light striking the base Replaces what would ordinarily be voltage applied to the base so, a photo- transistor amplifies variations in the light striking it. Phototransistors may or may not have a base lead . (if they do, the base lead allows us to bias the phototransistor's lig ....etc

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power amplifier circuit diagram



Circuit Description
There are many instances where a simple and reliable power amplifier is needed - rear and centre channel speakers for surround-sound, beefing up the PC speakers, low powered tweeter amplifier, etc. For those who want to build their own 'Gainclone' amplifier, this will certainly do the job :-)
This project (unlike most of the others, but in a similar vein to Project 19) is based almost directly on the typical application ci ....etc

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Automatic temperature controlled fan
Here is a scheme through which the fan can be linearly thespeed controlledautomatically, dependingon the room temperature. The scheme is effective because it ishighly control thyristors forpower. Alternatively, samecircuit can be used to automatically control AC temperaturecontrolled.In this diagram, temperature NTC thermistor is sensorused, i.e. one Havinga multiplier negative temperatures. The resistance of the thermistor in Thevalue 25 with the isabout 1 kilogram-ohm.Op Amp A1 essentially works for ASI t ....etc

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to get information about the topic phototransistor related topic refer the page link bellow

http://seminarsprojects.net/Thread-phototransistor-a-leap-of-optoelectronics ....etc

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