How to make a simple LED flip-flop circuit

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This is the second solderless breadboard project on the channel. The previous project introduced the um66 integrated circuit and demonstrated how to build that simple circuit on the solderless breadboard. This project is further demonstrating how to make a multivibrator circuit on the solderless breadboard.

Figure 1 is the schematic diagram of the multivibrator circuit and figure 2 is the pictorial diagram of the circuit.

Multivibrator Circuit Diagram
Figure 1

If you have difficulty making a circuit by using a schematic diagram. Getting a pictorial diagram help to fix the circuit on the project board.  You can install electronic components on the breadboard according to the graphical drawing components are attached.


Multivibrator Circuit
Figure 2

     Item list for the multivibrator circuit.
    1. 100Ω Resisters (Brown, Black, Brown)  - 2
    2. 10KΩ Resister (Brown, Black, Orange) - 2
    3. 5mm Red Colour LED - 2
    4. 100µF, 10V Electrolytic Capacitors - 2
    5. BC547 Transistors - 2
    6. Solderless Breadboard - 1
    7. 1.5Vx2, AA Type Battery Holder with Batteries  - 1
    8. Jumper Wire - 1m

Appendix:

Figure 3 is the final circuit arrangement of the breadboard. 

Multivibrator Circuit
Figure 3




Comments

  1. Matthias BraunlowFebruary 5, 2022 at 11:45 AM

    Just starting out on my new hobby of electronics and this was my first attempt at a basic blinking circuit.
    Attempt #1 failed - Troubleshot and realized I had confused the E/C/B assignments on my substituted 2N3904 transistor.
    Attempt #2 failed - I found your circuit on YouTube first and did not consult the blog page so when using the schematic didn't realize the diagonal lines intersecting are not an intended node. Once I reviewed the pictorial I saw the cross-over better designated.
    Attempt #3 failed - Troubleshot with multimeter on resistance setting and realized I had interchanged my 100 Ω and 10K Ω resistor locations.
    Attempt #4 success! - It's just a blinking circuit but everyone has to start somewhere. Thanks for the tutorial :-)

    ReplyDelete
    Replies
    1. TinJunkBoxFebruary 17, 2022 at 9:37 AM

      You're welcome. I recommend you to refer, The manufacturer datasheet or transistor databook pin order before making any circuit in the future.

      Delete

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