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AS Level     >Semiconductor Follower Circuits<    

Semiconductor Follower Circuits


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  AS Level    Followers  0 of 12    Question 650    Audio Power Amp 06 
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Deadline not set1 of 12    Question 651    Audio Power Amp 07 
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Deadline not set2 of 12    Question 29    Bipolar Transistor 
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Deadline not set3 of 12    Question 30    Bipolar Transistor 
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Deadline not set4 of 12    Question 1226    MOSFET Circuits 
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Deadline not set5 of 12    Question 1228    MOSFET Circuits 
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Deadline not set6 of 12    Question 1229    MOSFET Circuits 
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Deadline not set7 of 12    Question 733    Op Amp Circuits 
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Deadline not set8 of 12    Question 735    Op Amp Circuits 
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Deadline not set9 of 12    Question 916    Op Amp Circuits Ideal 
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Deadline not set10 of 12    Question 917    Op Amp Circuits Ideal 
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Deadline not set11 of 12    Question 187    Op Amp Circuits Ideal 
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Deadline not set12 of 12    Question 291    Sub-systems 
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Deadline not set  Questions 0 to 12   -->  View All  

Op Amp Voltage Follower

Op Amp Voltage Follower

MOSFET Source Follower

MOSTETs don't start conducting until the gate voltage is above 2 volts (or more for some devices). This problem is overcome by biasing or using negative feednack.

MOSFET Source Follower

This circuit removes the biasing problem by including the MOSFET in the negative feedback path.

This is not an ideal way to control a motor because of the waste heat produced by the MOSFET. Variable pulse width digital switching is a much more efficient method.

MOSFET Source Follower with feedback

Bipolar Junction Transistor Emitter Follower

Transistors don't start conducting until the base voltage is above 0.7 volts. This problem is overcome by biasing or using negative feednack.

Emitter Follower

This circuit removes the biasing problem by including the transistor in the negative feedback path.

This is not an ideal way to control a motor because of the waste heat produced by the transistor. Variable pulse width digital switching is a much more efficient method.

Transistor Emitter Follower with feedback

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