How do I eliminate analog Preset.

Thread Starter

devilfrmheaven

Joined Oct 28, 2009
40
Hi All,

I am trying to build an LED dimmer circuit using PWM


I am looking for a way to eliminate the 50K preset P1 in the circuit. I would like a push button approach can somebody suggest me with a cheap IC.


Thanks in advance,
Devil
 

crutschow

Joined Mar 14, 2008
23,377
P1 controls the duty cycle (don't understand what you mean by "preset"). Are you saying you want some type of incremental approach to controlling the duty cycle with a couple of push buttons?

Edit: If you need push-button control you could use a digital pot to replace P1. But note that most digital pots have a maximum voltage of 5V so you would need to run the 555 portion of the circuit from 5V. The LEDs could still operate from 12V.
 
Last edited:

Thread Starter

devilfrmheaven

Joined Oct 28, 2009
40
I searched for all the ICs below at Cochin and could not get a single one :( is there any other option to get one of these?

Digital Potentiometer
AD5206
AD5220
AD5228
AD5263
AD5290
AD8400
DS1267
DS1809-100
DS1868
MAX5160
MAX5161
MCP4121
MCP4131
TDA7449

Debouncers
MCP41100
LTC6994
 
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