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Author Topic: transistor based pwm generator  (Read 3186 times)

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Offline aruna1Topic starter

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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
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Offline billhowl

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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 »

Offline aruna1Topic starter

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Re: transistor based pwm generator
« Reply #2 on: April 12, 2010, 08:19:43 PM »
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


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