FreeTrack Forum

I plan on  a 3 point headphone setup like Tankbuster using  3 IR LEDS, 6v power adapter, on/off switch. I plan on snading down the leds and use 3/4 pvc attached to the headphones.

I have no, I mean no electrical experience.  

Power supply Input AC 120 volt 60Hz 7w
                     Output DC 6 Volt 500mA Class 2 power Supply Adapter

Radio Shack , Led High output 5mm infared LED model 276-143
Electrical Characteristics (25 degrees C)
Radiant power output(100mA) -16mW min
Forward Voltage -1.2V
Forward Current -100mA
Viewing Angle to 1/2 intensity 45 degrees

Absolute max rating ( 25 degrees C)
Forward Voltage (20mA)- 1.6V
reverse voltage  5V
Forward current 1.2A
reverse Current 10qA
Wavelength - 940nm


SETUP MODEL 3 LEDS clip on headset or 3 LEDS cap
Power Supply= 6.0 v
type= Unregulated Power Supply ( IE Power Adapter)
Led Fwd Voltage=1.2V
Led Fwd Current = 100mA

Answer:

SETUP MODEL 3 LEDS clip on headset or 3 LEDS cap
POWER SUPPLY Power supply (V) 6.0 V !! Attention :
These unregulated power supplies usually provide a higher voltage than indicated (about 30%).
Power supply voltage adjusted for processing : +30% => 7.8 V
LED Led forward voltage (V - manufacturer info) 1.2 V Led forward current (mA - manufacturer info)
100 mA LED ASSEMBLY S : serial assembly RESISTOR COUNT 1 resistor(s) needed for the complete kit
RESISTOR THEORICAL VALUE 42 Ohms
RESISTOR CHOICE E24 SERIES Resistor value 43 Ohms 5%
Current 97.7 mA Dissipated power 0.41 Watts Total current in assembly 97.7 mA
Wiring diagram  I hope I get this right and not fry myself.  
Current------->>>>>>>>>>>>>>>>>>>>>>>>>>>
P--------------*-------------------*                                     Current
0                     S                            * RESISTER 43 Ohms        I using 68 Ohm
W                   W                            +                                       V
E                     I                             * LED                                V
R                     T                            *LED                                  V
S                     C                            *LED                                 V
U                     H                            +                                      V
P-------------   * -----------------*
<<<<<<<<<<<<<<<<<<<<<<<< Current<<<<<<<<<<

> current direction, * connection

Could not find 43 Ohm resister
found this 68 Ohm 1/2 watt 5% this is about a 30% rise in resistance.
I could use some help with this diagram if it is wrong

Hello !

There is no need to use 100mA for your LEDs. Usually,with this kind of LED, we recommend to use 70mA.

Rémy

didja @ 26/04/2008 - 01h03 a dit:

Hello !

There is no need to use 100mA for your LEDs. Usually,with this kind of LED, we recommend to use 70mA.

Rémy

Remy I was looking for IR LEDs that had the required wide angle and I have all ready bout the leds and resisters. I just need to get an on off switch, I am luck I am doing a seried instead of a parrel. That would have been a nightmare for me.