Hi,
I am interested in putting together a PWM to dim a 10M strip of LED lights. I want to control this via X10 / ZWave remote mains dimmer. This X10 / ZWave is a device that just varies the volatge e.g. 0 to 240v on the input side to a 12V switched power supply - resulting in output side that varies from 0 - 12V. What I thought of doing was using a voltage controlled PWM oscillator 555 type circuit. What I would like to do is increase the duty cycle based upon the 0 - 12V input reference voltage so that I can drive the array of LEDs ie as the input reference voltage increases the duty cycle increases, resulting in brightening LED array.
I have found many 555 based PWM circuits, but they rely upon a pot. How can I convert this so that I can inject my own external ref voltage to modify the PWM duty cycle?
Thanks
I am interested in putting together a PWM to dim a 10M strip of LED lights. I want to control this via X10 / ZWave remote mains dimmer. This X10 / ZWave is a device that just varies the volatge e.g. 0 to 240v on the input side to a 12V switched power supply - resulting in output side that varies from 0 - 12V. What I thought of doing was using a voltage controlled PWM oscillator 555 type circuit. What I would like to do is increase the duty cycle based upon the 0 - 12V input reference voltage so that I can drive the array of LEDs ie as the input reference voltage increases the duty cycle increases, resulting in brightening LED array.
I have found many 555 based PWM circuits, but they rely upon a pot. How can I convert this so that I can inject my own external ref voltage to modify the PWM duty cycle?
Thanks
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