Simple LED Flip-Flop for Beginners




A very simple Flip-Flop circut for beginners

Step 1: Parts List

Parts list:
- LED X2
- Resistor: 10K (brown-black-red) X2
- Electrolytic capacitor: 100uF X2
- Transistor: NPN like BC108 X2
- 9V Battery with connector
- Striped wire
- Breadboard
- Spongebob assistant (optional)

Step 2: Resistors

1K : Brown - Black - Red

10K: Brown - Black - Orange

Put resistors on the breadboard like pictures.

Step 3: LED

Put LEDs on the breadboard like pictures.

Notice to polarity of LEDs

Step 4: Capacitors

Put capacotrs on the breadboard like pictures.

Polarity is not very important

Step 5: Transistors

Put transistors on the breadboard like pictures

Step 6: Wiring

Connect point 5 to 11

Connect point 6 to 8

Connect point 2 to 9

Connect point 4 to 12

Connect point 7 to 10

Step 7: Battery

connect + to point 13

connect - to point 10

You can use 3V to 9V battery

Step 8: Run

You can use larger capacitors (like 470uf) for slower flashing and smaller (like 47uf or 10uf) for faster flashing.

Use a larger capacitor (like 470uf) for slower,or a smaller one (like 47uf or 10uf)for a faster blinking.

Step 9: Refrence

2 People Made This Project!


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5 Discussions


1 year ago

actually, the polarity of electrolytic capacitors is kind of important

1 reply

2 years ago

very well posted .i have made in five miniutes .you have posted step by step .No difficulty faced in making circuit. THANKS .


3 years ago on Introduction

Thanks for sharing such simple and consise information on Flip-Flops. I love that Sponge Bob was so willing to help you with this!

1 reply