MineDreeze

modified 10 years ago

Blinking Led

126

02:22:13

Adjust the 470k resistor to speed or slow down the blinking, or to slow the blinking you can increase size of the  capacitor.

This is based on a 2V 20ma rated LED. The 400ohm resistor in front of the LED drives the LED just below max current rating at a conservative 14.4ma. Lower the 400ohm resistor to increase the milliamps, just keep in mind the current rating of the LED you are using and don't exceed the current it's rated at.

published 10 years ago

zeeman2000

10 years ago

Output voltage 7.76v - 2v forward voltage of LED = 5.76v Divide by LED Forward Current of 0.02 amps gives a resistor rating of 288 ohms. Your resistor at pin 3 is too high.

zeeman2000

10 years ago

Sorry output voltage at pin 3 is 7.5 volts 7.5 volts - 2v LED Forward Voltage = 5.5v 5.5v / 0.02 LED Forward Current = 275 ohms resistor required

SkeLe

10 years ago

Use a 200ohm resistor instead of the 400k one (I'm referring to the output one).

MineDreeze

10 years ago

So @zeeman2000 i put a 275 ohms resistor.... but... what is the pin 3? Sorry for the stupid question

MineDreeze

10 years ago

@SkeLe if i put a 200 ohm resistor at the output of the 555 it changes nothing!

rich11292000

10 years ago

Replace the 400,000 ohm resistor with 200 ohm, pin 3 is the output where the led is.

kievci

10 years ago

Pin 3 is Out pin, zoom in circuit to see pin's numbers on IC

epsilon

10 years ago

Hello, I put 300ohm on output resistor instead of 400k. It is working.

djx

10 years ago

When you put 200 ohm in make sure there is no k, 200k will not work as it will not allow enough current through to light the led , 200 ohm works just fine

craignect01

10 years ago

As they said, your resistor cut off too much current before it got to the led. I just dialed the resistor back to 200 ohms and it worked fine. That's all.

MineDreeze

10 years ago

Soery, but if i put a 200 ohm resistor at pin 3 it changes nothing

WTFCircuit

10 years ago

It works fine with 200 ohms resistor

tyral

10 years ago

You have to make an non inverter amp with a 500 ohms behind the led

tyral

10 years ago

Try ti ! It work for me when i correct your circuit !

MineDreeze

10 years ago

@WTFCircuit are you italian? Perche se si lo sono anche io xD

WTFCircuit

10 years ago

E se non lo sono tu cosa sei?

MineDreeze

10 years ago

@WTFCircuit ... se non lo sei scusa... volevo solo dire che ci eravamo parlati in inglese prima....

WTFCircuit

10 years ago

Sisi lo sono, veneto precisamente... Tu?

MineDreeze

10 years ago

@WTFCircuit io soni ligire :D

MineDreeze

10 years ago

Ligure*

WTFCircuit

10 years ago

E quanti anni hai?

MineDreeze

10 years ago

@WTFCircuit ho 16 anni

WTFCircuit

10 years ago

Io 17

add comment in editor

EveryCircuit is an easy to use, highly interactive circuit simulator and schematic capture tool. Real-time circuit simulation, interactivity, and dynamic visualization make it a must have application for professionals and academia. EveryCircuit user community has collaboratively created the largest searchable library of circuit designs. EveryCircuit app runs online in popular browsers and on mobile phones and tablets, enabling you to capture design ideas and learn electronics on the go.