Contents
When transistor operates as a switch collector current is zero at?
Therefore, as the base current is greater than 56.8 micro ampere current, the transistor will be driven to saturation i.e., it is fully ON, when 5V is applied at the input. Thus, the output at the collector becomes approximately zero.
Do transistors amplify voltage or current?
A small AC voltage at the transistor base generates a small base-emitter current which is amplified by the transistor to give a larger AC collector current. This amplified collector current through the collector resistor creates an AC voltage that is greater than the input voltage, thus the input voltage is amplified.
Is it possible to use an NPN transistor to control a 5V?
However, if you used a PNP transistor with the emitter being fed by the 5V there is a fairly good chance that you can attain 5V (less maybe 10 or 20 millivolts) on the collector (load side) without much hassle.
What is the base current of a silicon transistor?
For silicon transistor, V BE = 0.7 V Therefore, as the base current is greater than 56.8 micro ampere current, the transistor will be driven to saturation i.e., it is fully ON, when 5V is applied at the input. Thus, the output at the collector becomes approximately zero.
What happens when you use a transistor as a switch?
Transistors that are fully “ON” are said to be in their Saturation region. Transistors that are fully “OFF” are said to be in their Cut-off region. When using the transistor as a switch, a small Base current controls a much larger Collector load current.
How does a Darlington transistor work as a switch?
Darlington Transistors simply contain two individual bipolar NPN or PNP type transistors connected together so that the current gain of the first transistor is multiplied with that of the current gain of the second transistor to produce a device which acts like a single transistor with a very high current gain for a much smaller Base current.