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PWM DIMMER using IC 555, FADE IN- FADE OUT WITH DELAY

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MihajSimi

New Member
Hi there,

How can I mofify the PWM to get this:

1.PRESS OFF THE BUTTON. TURN ON THE 555 and FADE IN, mean get lineary boost of the duty cycle from 0%-100% (by for ex. 2 seconds)

2.PRESS OFF THE BUTTON. TURN OFF THE 555 by 10 seconds delay by fading out. 100% - 0% the same (by for ex. 2 seconds)

How can I do that? :(

I just set this on prototype board to get the ordinary 555 PWM. Can be modified to do my purpose? If, then how? :(

The schema i used
8819-555pwm.gif
 

jimlovell777

New Member
one option is to replace the 100K pot with a 100k digital pot. You can get digital pots that simply increase or decrease their resistance depending on whether an input is high or low during a clock cycle. There are several ways to take this project, what elements are you comfortable working with?
 

MihajSimi

New Member
I am absoulutely amateur. :)


I like the idea of a digital potenciometer :) But what will it change... ???

I mean how to do the fade in/out and delay...

I have a question... little off the topic... The digital pot. can be bypassed?

I mean if wanted someday to extend this circuit by another input, for example computer to do the job, can it be bypassed? and controlled via comp? without manual switching the control device (pot / comp)???

thanks :)
 

misiacik7

New Member
Is that a simple way to make it DIGITAL from Input till Output?

I mean for example 16bit communication for 65536 steps for smooth fading IN/OUT.

Is there a simple way to do that? Is there a way to build the wheel without positions (digital) used on some stereos? I want it digital cause of later communication with PC. thanks
 
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