an electric device that gives electric pulses

Status
Not open for further replies.
W

wado

New Member
Hi I’m not good at electronic and I have this small project.
I need to build a circuit that can give electric pulses using timers
I have LM 555cn timer
two resistor R1=180 kΩ R2=1 kΩ
tow capacitor C1=4.7µF C2=0.01µF
one LED
is this is the right components and how to connect them
thank you
 
Google is your friend. You will need a resistor (~470Ω) in series with the LED to limit its current so you dont damage it. The referenced circuit shows two LEDs; you only need one; either between V+ and pin3 or between pin 3 and ground.
 
Also if you use the 555 and read up on Vcontrol for it you can adjust the duration of the pulses. If I'm not mistaken doing this will be able to vary the intensity of the LED.(basically PWM) I forget exactly how it's done but by varying Vcontrol you change the comparitors inside the 555 which changes the duration of you pules set by the cap and two R's.
 
It would take a second 555 to modulate the brightness that way. If the OP really wants to vary the brightness of his LED, why not just put a rehostat in series with the LED inplace of the fixed resistor
 
agreed. That's probably the simplest way. Why would you need two 555's though? Don't mean to get off subject...just curious
 
wuchy143 said:
agreed. That's probably the simplest way. Why would you need two 555's though? Don't mean to get off subject...just curious
Click to expand...

One to set the flash rate of about 2 flashes per second, and the second to PWM the LED at a rate of 30-60 Hz(above the eye's flicker fusion rate).
 
Last edited:
Status
Not open for further replies.

Similar threads

S
Device that Data Logs Generator Output?
Replies
5
Views
1K
Soul21
S
J
  • Question
Why did I get an electric shock from this?
Replies
10
Views
4K
John Jones
J
G
  • Question
Help - set up WiFi to remote device
Replies
8
Views
2K
GH Crash
G
J
  • Question
Testing a Capacitor Microfarad Rating that has a Resistor
Replies
3
Views
386
Externet
  • Question
What is the waveform and frequency of the lcr t4 device when testing the capacitor?
Replies
7
Views
603
danadak
Menu
Log in
Register
Cookies are required to use this site. You must accept them to continue using the site. Learn more…