The
design of a transistor allows it to function as an amplifier or a switch. This
is accomplished by using a small amount of electricity to control a gate on a
much larger supply of electricity, much like turning a valve to control a
supply of water.
Transistors are composed of three parts – a base, a collector, and an emitter. The base is the gate controller device for the larger electrical supply. The collector is the larger electrical supply, and the emitter is the outlet for that supply. By sending varying levels of current from the base, the amount of current flowing through the gate from the collector may be regulated. In this way, a very small amount of current may be used to control a large amount of current, as in an amplifier. The same process is used to create the binary code for the digital processors but in this case a voltage threshold of five volts is needed to open the collector gate. In this way, the transistor is being used as a switch with a binary function: five volts – ON, less than five volts – OFF.
Transistors are composed of three parts – a base, a collector, and an emitter. The base is the gate controller device for the larger electrical supply. The collector is the larger electrical supply, and the emitter is the outlet for that supply. By sending varying levels of current from the base, the amount of current flowing through the gate from the collector may be regulated. In this way, a very small amount of current may be used to control a large amount of current, as in an amplifier. The same process is used to create the binary code for the digital processors but in this case a voltage threshold of five volts is needed to open the collector gate. In this way, the transistor is being used as a switch with a binary function: five volts – ON, less than five volts – OFF.
Types of Transistor
1. PNP Transistor
2. NPN Transistor
3. Field-Effect Transistor
1.PNP Transistor
NPN Transistor identification in write the “A” & “B”
Checking
Meter Set X10. Meter Negative Probe Connect on Base (-) Leg and Meter Positive Probe Connect on Collector (+) Leg. Meter Show Reading Transistor OK.
2.NPN Transistor
NPN Transistor identification in write the “C” & “D”
Meter Set X10. Meter Negative Probe Connect on Base (-) Leg and Meter Positive Probe Connect on Collector (+) Leg. Meter Show Reading Transistor OK.
3.Field Effect Transistor
Checking
Step 01Meter Negative Probe Transistor Leg (Drain)
Meter Positive Probe Transistor Leg (Source)
it's show reading
Step 02
Meter Negative Probe Transistor Leg (Drain)
Meter Positive Probe Transistor Leg (Gtae)
it's no show reading
Step 03
Meter Negative Probe Transistor Leg (Drain)
Meter Positive Probe Transistor Leg (Source)
it's no show reading
Step 04
Meter Negative Probe Transistor Leg (Gate)
Meter Positive Probe Transistor Leg (Drain)
it's show reading
Step 05
Meter Negative Probe Transistor Leg (Drain)
Meter Positive Probe Transistor Leg (Source)
it's show reading OK
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