00:00This is a transistor
00:02So how do you make a transistor work?
00:04First, the collector must have a direct current supply
00:07Add a resistor to the collector
00:10Ground the emitter and power supply negative
00:13At this point, the collector and emitter of the transistor form a circuit
00:17Want to have a current IC
00:19It is generated by the base current IB
00:22So the base has to be powered
00:25The supply voltage is between 0.6V and 0.7V
00:29Assuming it is 0.7V
00:35Connect the voltage dividing resistor and form a circuit
00:38The total circuit voltage is 12V
00:41When the voltage of R2 reaches 11.3V
00:44So R3 is 0.7V
00:47At this point, the voltage to ground at point A is 0.7V
00:52Connect point A to the base
00:54The voltage to ground at point B is also 0.7V
00:58The transistor is turned on
01:00Now this circuit has 3 currents
01:02IB, IC, IE
01:05When IB times is less than IC
01:08The transistor is in a static amplification state
01:11And the voltage that provides DC power
01:14We call this the bias circuit
01:16Oh
01:34Asle
01:36Next
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