Week #4: PWM Circuits

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rjagodowski
Posts: 2362
Joined: Fri Sep 04, 2015 6:59 pm

Week #4: PWM Circuits

Post by rjagodowski »

NOTE: Due to a difference between our lab equipment and what is specified in this lab, there are numerous adjustments and changes made to the schematics and tables in the handouts. Follow the modified directions on the lab sheet very carefully.

This week we will investigate the operation of two circuits which will create a PWM (Pulse-Width Modulated) output. You can download a copy of the experiment here in the Registered Users Only area. A hard copy will be provided for you in lab on Tuesday or Thursday.

Post your screenshots as a Reply to this Topic.

The first circuit uses the LM311 Precision Comparator which most of you used last semester for the Thermostat Temperature Comparator experiment, along with the LM34. There are additional handouts to explain the operation of the LM311 and the actual LM311 Data Sheet.

There is a second PWM circuit which makes use of a 555 Timer IC which will be used to create a PWM signal amplified by an NPN transistor to drive a 12V DC fan. You should take a few sample screenshots of the 555 output as well, noting the proportional speed of the motor at each Duty Cycle setting.

Exp. #4 PWM Control Circuit v21.1.pdf
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LM311 comparators.pdf
(117.82 KiB) Downloaded 229 times
LM311 Data Sheet.pdf
(1.76 MiB) Downloaded 228 times
555 PWM Circuit Controlling a DC Motor The second lab circuit is based on this.
cclozinski2001
Posts: 56
Joined: Fri Sep 25, 2020 10:16 am

Re: Week #4: PWM Circuits

Post by cclozinski2001 »

Cole Lozinski and Korey Houle
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jrgonzalez2001
Posts: 54
Joined: Fri Sep 25, 2020 10:38 am

Re: Week #4: PWM Circuits

Post by jrgonzalez2001 »

Jorge Gonzalez
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jejagodowski2001
Posts: 47
Joined: Tue Sep 14, 2021 7:00 pm

Re: Week #4: PWM Circuits

Post by jejagodowski2001 »

Joseph Jagodowski Week #4

1. 1.25 V potentiometer setting
2. 2.50 V potentiometer setting
3. 3.75 V potentiometer setting
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Rplizak
Posts: 32
Joined: Tue Sep 15, 2020 7:08 pm

Re: Week #4: PWM Circuits

Post by Rplizak »

Week 4 Lab
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npdesantis
Posts: 58
Joined: Fri Sep 25, 2020 10:35 am

Re: Week #4: PWM Circuits

Post by npdesantis »

nick desantis

1. 1.25 V pot setting
2. 2.50 V pot setting
3. 3.75 V pot setting

10x probe setting-yes!
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afnaser0001
Posts: 15
Joined: Tue Mar 31, 2020 11:02 am

Re: Week #4: PWM Circuits

Post by afnaser0001 »

Week4
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wmpenalo0001
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Re: Week #4: PWM Circuits

Post by wmpenalo0001 »

William Penalo
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issalman
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Re: Week #4: PWM Circuits

Post by issalman »

Week 4
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