Author Topic: transistor based pwm generator  (Read 1970 times)

0 Members and 1 Guest are viewing this topic.

Offline aruna1Topic starter

  • Supreme Robot
  • *****
  • Posts: 381
  • Helpful? 4
  • I'm an Ordinary guy
transistor based pwm generator
« on: April 12, 2010, 04:11:47 AM »
Hi guys I need a small PWM generator circuit to control brightness of two LEDs. well I'm looking for a transistor based circuit.any ideas? (i want to make it smaller thats why i didnt choose 555 timer)
thanks
Logged
I'm Me

Offline billhowl

  • Supreme Robot
  • *****
  • Posts: 370
  • Helpful? 32
  • Your success is in your hands.
Re: transistor based pwm generator
« Reply #1 on: April 12, 2010, 07:20:23 AM »
http://en.wikipedia.org/wiki/Multivibrator

C1, C2 = 0.0022uF
R1, R4 = 1 K Ohms
R2, R3 = 10K Ohms
R5 = 2M Ohms

« Last Edit: April 12, 2010, 06:25:43 PM by billhowl »
Logged

Offline aruna1Topic starter

  • Supreme Robot
  • *****
  • Posts: 381
  • Helpful? 4
  • I'm an Ordinary guy
Re: transistor based pwm generator
« Reply #2 on: April 12, 2010, 08:19:43 PM »
Quote from: billhowl on April 12, 2010, 07:20:23 AM
http://en.wikipedia.org/wiki/Multivibrator

C1, C2 = 0.0022uF
R1, R4 = 1 K Ohms
R2, R3 = 10K Ohms
R5 = 2M Ohms




hi i think
C1, C2 = 0.1uF
R1, R4 = 1 K Ohms
R2, R3 = 10K Ohms
R5 = 100k Ohms

is more suitable.it gives better pwm shape.
see the simulation result


Logged
I'm Me
 

Related Topics

  Subject / Started by Replies Last post
4 Replies
1796 Views 		Last post January 10, 2008, 06:57:34 PM
by paulstreats
13 Replies
3594 Views 		Last post June 25, 2011, 02:08:11 PM
by waltr
4 Replies
1023 Views 		Last post March 21, 2012, 03:49:11 PM
by Soeren
3 Replies
542 Views 		Last post April 08, 2012, 03:50:55 PM
by Soeren


Get Your Ad Here