The Wheatstone Bridge

Lets discuss about "The Wheatstone Bridge".

Bridge Circuits

What is Bridge Circuits ? Why do they called so? Discuss about them.

The Long-Tailed Pair (LTP) Circuit

• The term 'long-tail' came from the fact that the large resistor connecting the emitters of the transistors to ground or a power supply resembles a long tail. 
• In Figure, wherein NPN transistors are used to form the pair, this resistor is tied to ground.  
• The long tail actually functions as a current source, and may in fact be replaced a more elaborate 'active' current source circuit.

 

 

The Long-Tailed Pair (LTP) Circuit

Do you know about The Long-Tailed Pair (LTP) Circuit ? If so discuss about it.

Darlington pair

• The Darlington pair is basically a combination of two bipolar transistors connected as shown in Figure below.
• This circuit is used for amplifying currents, i.e., the amplified current from the first transistor is further amplified by the second transistor.
• Needless to say, this transistor combination exhibits a much higher current gain than if only one transistor were used.