uspilot
New Member
Hi Everyone,
I'm not only new to this forum, but new to the electronics field.
I recently built a 90 LED Infrared Illuminator, and had a question about the power supply I was going to use...
Power Supply:
12vDC 500mA
Individual LED Info:
Voltage Drop = 1.5v
Current = 100mA
Project Info:
15 banks of 6 IR LED's, with one 33ohm 1/4watt resistor per bank.
The 6 LED's are wired in series, and the banks themselves are wired in parallel.
----------------------------------------------------------
R = V / I
R = (12v - 6*1.5v) / 0.1A
R = 3V / 0.1A
R = 30 ohm resistor (used 33 ohm resistor)
----------------------------------------------------------
I = V / R
I = (12v - 6*1.5v) / 33 ohms
I = 3v / 33
I = .0909A or 90.9mA
----------------------------------------------------------
So, 90.9mA is close enough to the required 100mA per LED.
Now, here's the question...
With the banks of 6 LED's themselves being wired in parallel in the circuit, will the 500mA power supply cover the total draw?
I don't know enough about the electrical end of it to know what the total draw on a DC parallel circuit would be.
Thank you to anyone that reponds!
Mike
I'm not only new to this forum, but new to the electronics field.
I recently built a 90 LED Infrared Illuminator, and had a question about the power supply I was going to use...
Power Supply:
12vDC 500mA
Individual LED Info:
Voltage Drop = 1.5v
Current = 100mA
Project Info:
15 banks of 6 IR LED's, with one 33ohm 1/4watt resistor per bank.
The 6 LED's are wired in series, and the banks themselves are wired in parallel.
----------------------------------------------------------
R = V / I
R = (12v - 6*1.5v) / 0.1A
R = 3V / 0.1A
R = 30 ohm resistor (used 33 ohm resistor)
----------------------------------------------------------
I = V / R
I = (12v - 6*1.5v) / 33 ohms
I = 3v / 33
I = .0909A or 90.9mA
----------------------------------------------------------
So, 90.9mA is close enough to the required 100mA per LED.
Now, here's the question...
With the banks of 6 LED's themselves being wired in parallel in the circuit, will the 500mA power supply cover the total draw?
I don't know enough about the electrical end of it to know what the total draw on a DC parallel circuit would be.
Thank you to anyone that reponds!
Mike