I am looking to convert a PWM signal to to analog voltage to drive a LED 10 segment bar graph.
I found this handy number here http://www.ontrak.net/pwm.htm and it looks pretty easy, its a low-pass RC filter made with a resistor and cap.
I want to drive a LM3914 and 10 led bar graph with the analog voltage to indicate what the duty cycle is. 0 leds lit = 0% duty ~ 10 leds lit = 100% duty.
If the PWM is at 1KHz, what size resistor and cap is needed?
Sorry for the noobishness, I've been learning tons from you guys so far
Thanks again
I found this handy number here http://www.ontrak.net/pwm.htm and it looks pretty easy, its a low-pass RC filter made with a resistor and cap.
I want to drive a LM3914 and 10 led bar graph with the analog voltage to indicate what the duty cycle is. 0 leds lit = 0% duty ~ 10 leds lit = 100% duty.
If the PWM is at 1KHz, what size resistor and cap is needed?
Sorry for the noobishness, I've been learning tons from you guys so far
Thanks again