Lab #23

# Lab #23 - JaclynAucoin Summer2003Sec1 Lab#23...

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Jaclyn Aucoin Summer 2003-Sec 1 Lab #23 Digital Voltmeter 7/9/2003 Lab Partner: Steve Smith

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1) Use a potentiometer in figure 1 to obtain a dc voltage that can be varied from 0 to 5V. The first step is to change the dc voltage into a low-frequency square wave, whose amplitude is approximately equal to the original voltage. How well does the circuit in figure 1 do this? The circuit in figure 1 does it extremely well by looking at our scope. 2) Connect the circuit in figure 2 to the output of the circuit in figure 1. What is the waveform at the base of the npn transistor in figure 2? At node Vb the waveform is sketched in my timing diagram. How does it change with the amplitude of the square wave coming from figure 1. This is best shown in my timing diagram, but while the output of figure one is at OV the amplitude at Vb is increasing. How does the waveform on the collector of this transistor change with the input amplitude? This is also best shown in my timing diagram, but when
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