Current Limiting Resistor Calculator for Leds
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If you want to calculate Resistor, please visit Here!
Some good values to try:
As supply voltage:
For molex: 5, 7 and 12 volts
Batteries: 1.5 and 9 volts
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8:02 PM
For this Section, Please read Infrared Light Photo-Detector Circuit First!
A Practical Quad Photo-Detector Circuit
The next circuit is for a practical 4 photo-detector circuit using an LM339 Quad comparator IC. Although phototransistors are shown, photocells could also be used with the corresponding change in values for resistors R1 through R4.
This circuit can also be used for infrared detector circuits as shown HERE!
The values for resistors R7 through R10 can also be changed depending on the required LED current.
A Practical Quad Photo-Detector Circuit
The next circuit is for a practical 4 photo-detector circuit using an LM339 Quad comparator IC. Although phototransistors are shown, photocells could also be used with the corresponding change in values for resistors R1 through R4.
This circuit can also be used for infrared detector circuits as shown HERE!
The values for resistors R7 through R10 can also be changed depending on the required LED current.
