Report

Sixth Experiment:
Transistor Switching
Lab Partner: Jivonni, Sosa
determine: 04-03-2012
Due Date: 04-17-2012

Objective:
* Construct and taste a basic one junction electronic transistor racing band for its switching characteristics.
* rationalise how measurements clear determine if a transistor is in shortcut or is saturated.
* Add a second transistor to the transistor circuit and measure the switching threshold.
* Add hysteresis to the circuit and test both switching threshold.
Materials Needed:
* One solderless breadboard
* immunity 330, 1 k and two 10k
* One 10 k potentiometer
* Two small signal npn transistors
* One LED ( mouser 606-4303F1 or equivalent)
Procedure:
1. Measure and record the values of the resistors listed in defer 6-1. R1 is a 10 k ohm potentiometer and is not listed in the table. Rc1 is used in step 4, and RE is used in step 6.
2. Ideally, a transistor switching circuit should absorb either in shortcut or in saturation. The circuit shown in figure 6-1 is a basic transistor amplifier. It can easily be set for operation at these extremes by varying the potentiometer (R1). However, it can also operate amidst shortcut and saturation, a condition not desirable in a switching circuit.



Compute the collector-emitter voltage (VCE) at cutoff and saturation and the voltage crosswise the collector resistor at saturation (VRC). Compute ISAT by assuming g a 2.0 V drop across the LED and 0.1 V across the transistor. Show the computed values in Table 6-2.
3. Construct the circuit in Figure 6-1 and observe the effect of varying the potentiometer. bushel the potentiometer to the minimum value and measure VCE at cutoff (the LED should be off). Then set the potentiometer for maximum (LED on), and measure VCE (saturation) and the voltage across the 1.0 k ohm collector resistor, VRC (saturation). The transistor is saturated since it can supply no more received in the collector circuit. Record measurements in Table 6-2 and equivalence to the computed values...If you want to get a full essay, order it on our website: Ordercustompaper.com



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