Week #4: PWM Circuits

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rjagodowski
Posts: 1782
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 a circuit 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
(1.46 MiB) Downloaded 11 times
LM311 comparators.pdf
(117.82 KiB) Downloaded 56 times
LM311 Data Sheet.pdf
(1.76 MiB) Downloaded 55 times
555 PWM Circuit Controlling a DC Motor The second lab circuit is based on this.
noong0001
Posts: 41
Joined: Fri Sep 06, 2019 9:52 am

Re: Week #4: (2/10-14) PWM Circuit

Post by noong0001 »

Experiment #4
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noong0001
Posts: 41
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Re: Week #4: (2/10-14) PWM Circuit

Post by noong0001 »

Experiment#4
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noong0001
Posts: 41
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Re: Week #4: (2/10-14) PWM Circuit

Post by noong0001 »

Experiment#4
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jcolon0004
Posts: 31
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Re: Week #4: PWM Circuits

Post by jcolon0004 »

Week 4 250
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mmlopez0002
Posts: 40
Joined: Fri Sep 06, 2019 9:46 am

Re: Week #4: PWM Circuits

Post by mmlopez0002 »

mmlopez0002
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drodriguez0004
Posts: 36
Joined: Tue Sep 11, 2018 6:23 pm

Re: Week #4: PWM Circuits

Post by drodriguez0004 »

Experiment #4
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hbonney0001
Posts: 20
Joined: Fri Sep 06, 2019 9:51 am

Re: Week #4: PWM Circuits

Post by hbonney0001 »

wk4 hb
hbonney0001
Posts: 20
Joined: Fri Sep 06, 2019 9:51 am

Re: Week #4: PWM Circuits

Post by hbonney0001 »

wk 4 HB WORKED WITH NAI
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