Breadboard Circuits Tutorial - 555 Police Lights

Thanks for explaining the 555 timer

Excellent tutorial! I’m glad I’m not the only person who doesn’t know why pin 6 and pin 2 are connected. It just seems like a part of life 😀

Beautiful clear video. You are a gifted teacher. Thank you.

Excellent share. thank you for this I shall prepare it with my 7 year old daughter as her first tuturial to Breadboard

Thank you for this easy to follow 'monkey see, monkey do' tutorial, it's my first time using a 555 timer and literally brightened my day when it all worked, I appreciate you sharing your knowledge :)

Thanks so much. Very helpful and clear

Nice video, thanks for sharing it with us, well done :)

The rst(reset) pin of the 555 timer is active low, meaning when you connect the rst(pin 4) to ground(-supply voltage) the 555 is locked into the reset mode. Generally one connects pin 4 to +supply voltage(pin 8) to make certain it won't drift low with electronic noise present in the environment. Also the datasheet recommends a small value capacitor, 0.1 uF, or 100 nF, between pin 5 and ground if you won't require the CTRL function, for the same reason. Neither is required in most instances for a standard 555 IC, but becomes more important for the low power CD7555 CMOS IC. Otherwise well done.

There's flat side on the LED's and so they "tell you" also...right?

8:05, can you please explain why is red light on ? it seems the current is going from pin 3 to the negative light of red light which is wrong.

I want to do a traffic light situation but with like several rows of it being led lights green, then yellow then red. How would I go about this and I also need to use timed relays.

Please include a picture of the circuit diagram in the beginning.

Most versions of this circuit connect the capacitor to positive supply not pin 3. And you don't have the capacitor connected through a resistor to pin 7 to discharge.

I tried it

You connected to pin 7 instead of pin 6 threshold in one of the steps

Capacitor negative always in whait line marks

If i want to light two blue and two red leds how can i connect them?

your awsome

I did this, only the blue light is on(not flashing) red one is off, even tho I copied the whole layout

This is fantastic. The only missing detail is to note that the Red and Blue LEDs operate on different voltages. I was using two reds and got wonky results. Red operates on about 2-3 volts, blue is about 5 volts. 100uf capacitor was a really slow blink, but 10uf was an easy swap.