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en.wikipedia.org/wiki/Common_collector

In electronics, a common collector amplifier (also known as an emitter follower) is one of three basic single-stage bipolar junction transistor (BJT) amplifier topologies, typically used as a voltage buffer.. In this circuit the base terminal of the transistor serves as the input, the emitter is the output, and the collector is common to both (for example, it may be tied to ground reference or ...

www.allaboutcircuits.com/.../chpt-5/voltage-follower

The voltage follower is the safest and easiest transistor amplifier circuit to build. Its purpose is to provide approximately the same voltage to a load as what is input to the amplifier but at a much greater current. In other words, it has no voltage gain, but it does have current gain.

en.wikipedia.org/wiki/Buffer_amplifier

If the voltage is transferred unchanged (the voltage gain A v is 1), the amplifier is a unity gain buffer; also known as a voltage follower because the output voltage follows or tracks the input voltage. Although the voltage gain of a voltage buffer amplifier may be (approximately) unity, it usually provides considerable current gain and thus ...

www.electronics-notes.com/articles/analogue_circuits/...

The emitter follower can be designed using the design flow below as a basis: Choose transistor: As before, the transistor type should be chosen according to the anticipated performance requirements. Select emitter resistor: Choosing an emitter voltage of about half the supply voltage to give the most even range before the onset of any clipping, determine the current required from the impedance ...

terpconnect.umd.edu/~toh/ElectroSim/Booster.html

Voltage follower with transistor output current booster Download for Macintosh or for PC.. The purpose of this circuit is to control the voltage across a load, represented by the resistance R L, which requires more current than can be provided by the output of the operational amplifier alone.An NPN power transistor is used to provide the required current gain.

electroniccircuitsforbeginners.blogspot.com/2009/05/...

Transistor voltage follower. Op Amp Voltage Follower: This circuit's operation is far more predictable and stable than the transistor version, and also requires less external components. How it works: Works as described above, no external elements to explain. This circuit uses feedback to maintain the voltage output the same as the input.

www.allaboutcircuits.com/.../chpt-4/common-collector-amplifier

The common-collector amplifier is also known as an emitter-follower. The output voltage on a common-collector amplifier will be in phase with the input voltage, making the common-collector a non-inverting amplifier circuit. The current gain of a common-collector amplifier is equal to β plus 1.

www.learningaboutelectronics.com/Articles/Transistor-buffer...

The transistor circuit will be configured as an emitter follower (another name is common collector circuit). An emitter follower is circuit is a transistor circuit in which the voltage at the emitter follows the input voltage. It is a mirror image, so to speak, of the input voltage.

www.analogictips.com/voltage-follower-unity-gain-amplifier...

A voltage follower is also known as a unity gain amplifier, a voltage buffer, or an isolation amplifier. In a voltage follower circuit, the output voltage is equal to the input voltage; thus, it has a gain of one (unity) and does not amplify the incoming signal.

sound.whsites.net/articles/followers.html

Preamble. A voltage follower, regardless of the technology used to build it, is a current amplifier. A small available current from the source is usually due to the circuit having a high impedance, so it cannot supply enough current to drive the following circuitry.