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About This Instructable

Posted:Aug 25, 2013

License:PublicDomain

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555 (/tag/type-id/category-technology/keyw ord-

555/)

speed control (/tag/type-id/category-

technology/keyw ord-speed control/)

timer (/tag/type-id/category-technology/keyw ord-

timer/)

dc (/tag/type-id/category-technology/keyw ord-dc/)

motor (/tag/type-id/category-technology/keyw ord-

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555 DC Motor Speed Control by gavargas (/member/gavargas/)

Collection I Made it!

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This is a pretty cool circuit that allows you to control the speed a DC motor of

considerable size! This circuit was made as part of the Jameco

(http://www.jameco.com) and Instructables Hacknight Hosted by H3 Laboratories in

El Paso Texas

Jameco sent us a grab bag of awesome components that we put into use right

away!

Bill of Materials:

1 - 555 Timer IC (from Jameco)

2 - Small Glass Rectifier Diodes

1 - High Current Rectifier Diode (Jameco)

1 - 1M Potentiometer (From Jameco)

1 - (Green, Red, Brown) Resistor

1 - 1K (Brown, Black, Red) Resistor

1 - Power MOSFET

2 - .01 F Ceramic Capacitors

1 - DC Motor

Step 1: Install Jumper Cables

Related

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(http://cdn.instructables.com/FNC/Z8XV/HKPX9298/FNCZ8XVHKPX9298.LARGE.jpg)

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Simple (and dirty) Pulse

Width Modulation (PWM)

With 555 Timer

(/id/Simple-and-dirty-

Pulse-Width-Modulation-DC Motor Speed Control

using PWM (/id/DC-Motor-

Speed-Control-using-

PWM/)

by Electronics HubPWM Variable Speed

Disco Ball (/id/PWM-

Variable-Speed-Disco-

Ball/)

by bennelsonlearn about the 555

(/id/learn-about-the-555/)

by Jimmy Proton

(/member/Jimmy Proton/)

555 Timer : Universal

PWM Controller (/id/555-

Timer-Universal-PWM-

Controller/)

by jacktrow

We will be needing a lot of jumper cables. I tend to install them first and later put in

the components but you can do it any way you want just follow the schematic. If

you want, you can follow my way.

Install the 555 IC on the breadboard.

Step 2: More Jumpers

(http://cdn.instructables.com/FNX/7MGM/HK6XAXJ7/FNX7MGMHK6XAXJ7.LARGE.jpg)

(http://cdn.instructables.com/FBJ/YO4J/HKPXBC3F/FBJYO4JHKPXBC3F.LARGE.jpg)

Install the other jumper that will be going to the potentiometer.

Step 3: Jumpers

More jumpers connecting pins 4 and 8 and 2 and 6

Step 4: Install the two capacitors .01F and diodes

(http://cdn.instructables.com/FTS/2D55/HKPXBC3K/FTS2D55HKPXBC3K.LARGE.jpg)

Follow the picture

Step 5: Install the remaining components as shown in thepicture

(http://cdn.instructables.com/FL9/RRZX/HKPX97E3/FL9RRZXHKPX97E3.LARGE.jpg)

(http://cdn.instructables.com/FYJ/EIOC/HKPX4NKQ/FYJEIOCHKPX4NKQ.LARGE.jpg)

The circuit is finished follow the schematic for more clarification on the position of

components.

Step 6: Video

Here we have a video demonstration of the circuit working:

This circuit was made as part of the Jameco (http://www.jameco.com) and

Instructables Hacknight Hosted by H3 Laboratories in El Paso Texas

(http://cdn.instructables.com/F9U/HEMB/HKPX4NKU/F9UHEMBHKPX4NKU.LARGE.jpg)

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Please be positive and constructive. I Made it! Add Images Make Comment

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euromoszeus (/member/euromoszeus/)

Hi

How much voltage that 470 uF capacitor includes?

aalejo (/member/aalejo/)

hey !!! what is that thing its looks like electrolytic caps if it what is the volt. and.... thefarad of the caps ? pls pm i want to try

msilg (/member/msilg/)

from where is the input done??

gavargas (/member/gavargas/) (author)

The schematic is correct. Pin 7 is equivalent to pin 3 but it does not go high. Thecircuit uses the gate of the MOSFET through pin 7, you can try it. It works

f renchie (/member/f+renchie/)

you need to correct the schematic. need to swap pin #'s for pin 3 and 7.

Phil B (/member/Phil+B/)

At the present I have no plans to use this circuit, but I appreciate what you havedone. It is very practical.

Raphango (/member/Raphango/)

Great project! The 555 works like a PWM emitter doesn't it? With frequency adjusted by thepotenciometer right? I don't know the difference between a MOSFET and a Transistor. What is it?

Thanks in advance!

gavargas (/member/gavargas/) (author)

That depends on the MOSFET you are using, this one is the IRF640 can handle18A @ 10V in 25C you can use different MOSFETs and power supplies andthe possibilities are even higher.

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paulgobble (/member/paulgobble/)

How many amps can this circuit handle?

gavargas (/member/gavargas/) (author)

Yes, they are correct:

(Pins 7 and 3 are "in phase.") Pin 7 is equal to pin 3 but pin 7 does not go high -it goes OPEN. But it goes LOW and will sink about 200mA.

http://www.555-timer-circuits.com/pin-configuration.html

dendonz (/member/dendonz/)

Hi,

Are 3 and 7 from the 555 correct? Output = 3 an Discharge is 7.

Den

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