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You are here: Home / Home Electrical Circuits / Making an Adjustable Electromagnet Circuit

Making an Adjustable Electromagnet Circuit

Last Updated on August 22, 2019 by Swagatam 16 Comments

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This article describes a simple circuit which can be used for pulsing an electromagnet. The IC 555 once again becomes the central part of the circuit. Let's learn the making procedure of this simple adjustable electromagnet circuit for varying the magnetic power of an electromagnet.

Introduction

The circuit was requested by Mr.Jason, one of the followers of this blog. Though I'm not sure of the application needs, the circuit probably can be used for controlling the average magnetic power of an electromagnet or rather the circuit may be considered an adjustable electromagnet circuit.

The circuit involved is quite basic and has been already employed in many applications, explained in my earlier posts. Here the application is quite similar to the earlier ones, that is controlling the output load through a series of varying pulses or through PWM method.

Circuit Operation

The mark/space ratio can be appropriately adjusted using the shown configuration, which in turn can be used for varying the response of the output load.

Here the output load is an ordinary homemade electromagnet, connected via a power transistor TIP 122.

The power of the electromagnet is at the maximum level when the pot is set for achieving high mark levels than the space levels and vice versa for reducing the magnetic effects of the electromagnet.

The electromagnet may be procured ready made or can be hand made at home using suitable lengths of enameled copper wire wound over a magnetic core, like an iron nail or rod etc.

The diode connected across the electromagnet protects the transistor from back emf fluxes of the electromagnet.

The circuit may be powered with voltages between 5 and 12, but the current must be appropriately rated, otherwise the circuit will fail to operate.... if a battery is used, make sure it's rated at least at around 1 Ah.

Once powered, this adjustable electromagnet circuit will enable  smooth adjustments of the attached electromagnet's magnetic field from zero to maximum.

Circuit Diagram

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About Swagatam

I am an electronic engineer (dipIETE ), hobbyist, inventor, schematic/PCB designer, manufacturer. I am also the founder of the website: https://www.homemade-circuits.com/, where I love sharing my innovative circuit ideas and tutorials.
If you have any circuit related query, you may interact through comments, I'll be most happy to help!

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  1. Greg D Gillespie says

    December 26, 2020 at 12:28 am

    I believe there are enough circuit examples out there to cover most situations if all one wants is a circuit that will work for their application with minor modifications maybe but a detailed explanation of how exactly these circuits work would be your most valued contribution to your followers.

    Reply
    • Swagatam says

      December 26, 2020 at 2:35 pm

      It is basically a variable PWM generator, meaning the ON/OFF timing of the pin3 output can be independently varied with the help of the pot. The ON time pulse can eb narrower or wider and vice versa with the pot which in turn decides the ON time of the transistor and the EM.Higher on time causes the EM to be more powerful, and lower ON time causes it to be weaker proportionately.
      To know how the IC generates the PWM you can read the following article:
      How to Generate PWM Using IC 555 (2 Methods Explored)

      Reply
  2. TJ Davidson says

    April 1, 2020 at 12:05 am

    I ran across this while designing a similar circuit.
    Do I understand right that this will continue to pulse on/off as long as it is connected to the power source? The 555 is in astable mode in your circuit?
    My circuit simply needs to pulse once when triggered. So I am trying to use the 555 in monostable mode. Currently my Pin2(Trigger) does not connect to Pin6(Threshold), but rather Pin2 is held high and has a momentary switch to ground.
    I am not using Pin4(Reset) at all. Should I be using Pin4?

    Reply
    • Swagatam says

      April 1, 2020 at 10:33 am

      yes pin4 must be connected to the positive, otherwise the monostable will not work, you can refer to the following article for more info

      https://www.homemade-circuits.com/interesting-timer-circuits-using-ic-555-explored/

      Reply
      • TJ Davidson says

        April 2, 2020 at 2:40 am

        Thank you so much for the help first of all!
        Here is the circuit I have made:
        https://drive.google.com/file/d/1HpHsFmg-9jpJaUBxJk0j6bNp1zXPClxJ/view
        Your linked article says
        “As per one of the characteristics the IC, once triggered it stops responding to any subsequent triggers, until the timing cycle is completed. But if one wants to terminate the timing cycle, this can be done at any moment by applying a negative pulse or 0 V to the rest pin 4.”
        For my application, I very specifically don’t want it to be possible for the timing cycle to be terminated.
        The circuit is working fine at the moment. I know connecting Pin 4 to the positive prevents unwanted resetting. What might cause that unwanted resetting? Is that the only danger of not connecting Pin 4?

        Reply
        • Swagatam says

          April 2, 2020 at 9:06 am

          Glad your circuit is working, as far as I know pin4 of IC 555 must be compulsorily connected to the positive line, otherwise the circuit might fail to work correctly, you can try it practically and check how it responds

          Reply
  3. Aqib Ahanger says

    December 9, 2015 at 4:11 am

    swagatam sir…. i have a 3 cable setop boxes… one has got a signal dropping problem which autimatically shows no signal after two or tgree minutes i have to switch on n off the supply of it then it worrks again n vice versa… another one shows on indicator but diesnt gives video out put at oll.. or like it doesnt takes the signal out put. .
    Aqib Noor
    Electronic n Electrical Technician…

    Reply
    • Swagatam says

      December 9, 2015 at 6:20 am

      I am sorry Aqib, i have no idea regarding signal processor units because these normally work with extremely sophisticated and complex circuits..

      Reply
  4. Brett Buckley says

    October 27, 2015 at 2:58 pm

    Making a micro controller based project and my project is a crane that will also have an electromagnet for picking up objects, would this circuit work for that?

    Reply
    • Swagatam says

      October 28, 2015 at 4:18 am

      the 555 section might not be required for your application, just feed the MCU output to the transistor base for controlling the EM.

      Reply
  5. TTGB says

    October 16, 2015 at 6:10 pm

    Could an LED display be added to this to visibly display the intensity of the magnetic field as it changes?

    Reply
    • Swagatam says

      October 17, 2015 at 4:19 am

      you can add an LED in series with the transistor base, this will enable the required indications…

      Reply
  6. Swagatam says

    April 26, 2015 at 8:42 am

    you can use an iron bolt and wind some 200 turns of 0.5mm magnet wire….but with an iron as the core make sure to reduce and fix the frequency of the IC 555 anywhere between 50 and 500 Hz not above this

    Reply
  7. Rspene smit says

    April 26, 2015 at 12:38 am

    What do you make the EM out of that would work best, wrap the red copper on an Iron Nail or sometype of Ferrite piece and if so, exactly what would i look for to purchased for it, thanks.

    Reply
  8. Gustavo A. Díaz says

    August 2, 2013 at 6:33 pm

    Hi! I was about to make something like this, since i need to test the speed sensor of my motorcycle (or modify the mileage, since i've buyed a new gauge that start from 0KM) but in a fast way (using high hz/Khz in the output of 555). So pulsed needed to simulate the wheel spining. This will work right? Thanks!

    Reply
    • Swagatam says

      August 3, 2013 at 7:56 am

      Yes, it will work in that way as it would effectively simulate the pulses acquired from a rotating wheel.

      Reply

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