Question

[voire]

Hi, I need some help. I'm trying to blink some LEDs from a signal generator. I have an app for my iPhone that generates frequencies. I plug a standard headphone jack into my iPhone, and there is another one on the other end of the wire. Can this work, for what I want? What is a simple circuit to let me control the blinking rate?

[Guest]

correction on led resistance

12.8v will supply the correct amount of current
with about 1.706K of resistance for the wattage of one 30mA 3.2v LED

.03a * 3.2v is .096w

.096 / 12.8v is .0075a

12.8v / 1.706 is 1706 and 2/3

[wrtner]

Hi, I need some help. I'm trying to blink some LEDs from a signal generator

Do you need to involve the signal generator?
If not, google for circuits for the 555 chip.