I am working on ordering some parts to finish breadboarding this circuit.
The actual arrays I plan to use are approximated in the box at the right.
The part I am concerned with is R10 and it's function. Using the formula given with the schematic - R = .06/I a 33ohm resistor is correct for the red piranha LEDs I am using. If I run the array through a calculator, given 2.8 volt drop and .020 amps I get a value between 100 and 150 ohms given the variables on a 12 volt system.
If any of that makes sense, what is the function of R10? Does it take the place of the normal series resistor? Is it in addition to those resistors? If it is supposed to take the place of them, having looked at the "LEDs, 555s,..." post this doesn't seem like a functional solution.
Also I would appreciate any additional input on this circuit's strengths/faults. And lets just consider this a bench project for now.
The actual arrays I plan to use are approximated in the box at the right.
The part I am concerned with is R10 and it's function. Using the formula given with the schematic - R = .06/I a 33ohm resistor is correct for the red piranha LEDs I am using. If I run the array through a calculator, given 2.8 volt drop and .020 amps I get a value between 100 and 150 ohms given the variables on a 12 volt system.
If any of that makes sense, what is the function of R10? Does it take the place of the normal series resistor? Is it in addition to those resistors? If it is supposed to take the place of them, having looked at the "LEDs, 555s,..." post this doesn't seem like a functional solution.
Also I would appreciate any additional input on this circuit's strengths/faults. And lets just consider this a bench project for now.