Circuit Board

Circuit board demo showing flashing LEDs and a counter. There is also a knob that can control flash and count rate. Flashing lights are fun to build and watch!

How It Works:
Lower left subcircuit is an op-amp astable multivibrator that generates a pulse waveform (square wave)... more like _--_--_--_--_--_--_--_. The pulse rate is determined by the resistor and capacitor values around that subcircuit.

Each side of the waveform turns on certain LED lights. Waveform directly powers the red LEDs.

Then, there are frequency dividers that cut the frequency in half. This doubles the light-time for the yellow LEDs and hence slows the flash rate. Frequency gets cut in half once more to light the green LEDs, which should flash the slowest.

There is also a 7-segment display (counter) that increases by 1 each time the red LEDs flash one full cycle.

Initial flash rate can be controlled by turning the variable resistor (potentiometer).

Category:

Science & Technology

Tags:

• circuit
• flash
• LED
• counter
• speed
• electronic
• components
• project
• engineer

[becomingzero]

Oh c'mon. Give the guy a break. There are people out there wasting their entire lives watching ego wanking celebrities get off for a pass time on youtube so what's another 34 seconds wasted gonna matter to you i or anyone else ;)

[AcousticBruce]

great comment

[HandMekeysYouFuCoSkr]

lulz

[fromtheinsides]

i didn't enjoy LOL i can make the same only with 7447 and 7490

[draadje1]

oh whaw...........just kidding, so special?

[TheRoknemec]

yeah, turn the wheel more. No suprise why people are getting dummer by the second!!!

[fabioguarin]

buen video hermanoo

[billcosby29]

i made the very same circuit in my engineering course a few weeks ago :)). Very pleasing when it all workd as i should, electronics is sexy. Im so awesome...

[3mustardMoNkEyS]

agreed...there are much more rewarding things to do than sit around watch celebs.

[kaloriblossom]

I can see that the LEDs are blinking in binary. The reds are the lowest column, the yellows are the middle, and the greens are the highest. You're using a binary to 7-segment chip to run the number display off of the binary count right?

[DeMonello83]

What's this video? you was trying a Ne555 timer, or similar?

how to create the effect of yellow leds? thanks.

[moradi28]

if i hook up a capacitor to a battery and aled to the capacitor and awore to the battery again will the led blink?