Hi Darrin,
I don't think there will be ANY problem with noticing the LEDs dimming. As the pot is changed from one extreme to the other, the _AVERAGE_ voltage at the NE555's output changes from close to 0v (about 179 mV for 10/9990 Ohms) to almost 12v. And because of persistence-of-vision, the average is what you will see.
The NE555 output voltage will always have approx 12v peaks. But when the duty cycle is very low, the output is almost all at 0v with extremely narrow 12v pulses. And when the duty cycle is high, the output is almost all 12v with extremely narrow drops to 0v.
- Tom Gootee
http://www.fullnet.com/~tomg/index.html
I don't think there will be ANY problem with noticing the LEDs dimming. As the pot is changed from one extreme to the other, the _AVERAGE_ voltage at the NE555's output changes from close to 0v (about 179 mV for 10/9990 Ohms) to almost 12v. And because of persistence-of-vision, the average is what you will see.
The NE555 output voltage will always have approx 12v peaks. But when the duty cycle is very low, the output is almost all at 0v with extremely narrow 12v pulses. And when the duty cycle is high, the output is almost all 12v with extremely narrow drops to 0v.
- Tom Gootee
http://www.fullnet.com/~tomg/index.html