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# Lab 4 - Part B In Part B we examine a push-pull circuit set...

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Caleb Simms Lab 4: Transistors Part 2 Introduction In this lab we continue our examination of the uses of transistors that began in the last lab. n part A we examine how a transistor can improve a current sink and in part B we look at a push-pull circuit. Part A . In part A we vary R in the two current sources shown below from 100 to 51k . Both are designed to give a current of 1mA. a) mA R k V i 1 5 5 + = when R<<5k b) mA k V i e 1 5 5 = = Part A Data. a) b) Compliance is 1k Compliance is 10k i(mA ) R ( k ) 1 .100 .98 .470 .95 1 .75 5.1 .60 10 .43 10 .23 51 i(mA ) R( k ) .94 .100 .94 .470 .94 1 .94 5.1 .94 10 .71 15 .54 20 .21 50

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Part A Conclusion . The compliance of circuit a was about what we would expect considering that R must be much smaller than 5k for the current to remain around 1mA. The second current source has compliance of 10k. This is because E C i i = so as long as the voltage drop across R is less than 10 volts, there is no change in E i . We know that the voltage drop across a 10k resistor is 10 volts, thus why that is the compliance of the second circuit.
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Unformatted text preview: Part B. In Part B we examine a push-pull circuit set up as shown below. In a) will don’t wire up the speaker, but instead focus on the output and how it changes from the input. In b) we compare the sound emitted from a speaker hooked up directly to the function generator to the sound of a speaker hooked up to the output of our push-pull. Data a) b) the sounds gets louder but with beating Part B Conclusion When we looked at the output in a) we saw that the output goes to zero and stays at zero for a short period of time instead of curving smoothly across it. This is because if V V in 6 . 6 . ≤ ≤-then neither transistor emits anything. In b) the sound is amplified because the pnp amplifies negative voltages while the npn amplifies positive ones but there is beating because of the cross-over distortion....
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Lab 4 - Part B In Part B we examine a push-pull circuit set...

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