 |
| Powered by phpBay Pro |
What component should i use to create a logic gate for my LED?
We are using a bi-color SMD LED blue/red (link below) and the idea is that the LED will always light blue until a switch is thrown then the blue will cease and the LED will illuminate RED. Will a transistor do this? if so which type?
http://www.us.kingbright.com/product.asp?catalog_name=LED&product_id=APHBM2012PBASURKC
http://www.us.kingbright.com/images/catalog/SPEC/APHBM2012PBASURKC.pdf
I assume you have only a single throw switch, if it were double throw you could just control the LEDs directly. If there are any spare gates on any devices already in the circuit you might want tot try to use them rather than add another device. A transistor could be used, or various type of gates could be used, an inverter could work, or NAND or NOR wired as an inverter (when one LED is turned on via the switch, the other is turned off by the inverter). I think one could also take advantage of the fact that the two colors have different forward voltages to control them with no additional components, however one would have limited control of the relative brightness, if the switch were in series with the red LED, and that combination was in parallel with the blue LED, and that whole thing in series with the current limiting resistor, when the switch is open the blue LED lights, when the switch is closed the red LED lights and drops the voltage to below the voltage the blue need so it turns off. Note that the red would be considerably brighter in this case as a series resistor sized for the red LED will be larger than desirable for the blue, plus the red is brighter for a given current to start with.
|
 1000 PCS PLCC 6 5050 3 CHIPS POWER SMD 6000mcd RED LED  US $449.99
|
 100x RED 42 SMD LED TAIL BRAKE LIGHT BULB 3157 3057 S US $422.39
|
 100 RED 1156 42 SMD LED TURN INDICATOR CAR LIGHT BULB S US $422.39
|
 10x5M Waterproof 5050 RGB 300 SMD LED Strip IR Remote US $384.99
|
 10x 5M 150 LED Strip Light 5050 SMD DC12V Red WPF US $382.69
|
 10X 5m RED SMD 3528 Waterproof Flexible 600 LED Strip US $378.15
|
 10x5M Waterproof 5050 SMD Red 300 LED Strip Lights bulb US $374.99
|
 10x 5M Waterproof 5050 SMD Red 300pcs LED Strip Light US $374.99
|
 10x 5M Waterproof 5050 SMD Red 300 LED Strip Lights H US $374.99
|
 10x5M Waterproof 5050 SMD Red 300 LED Strip Lights C US $374.99
|
 10x5M Waterproof 5050 SMD Red 300 LED Strip Lights G US $374.99
|
 10x5M Waterproof 5050 SMD Red 300 LED Strip Lights US $374.99
|
 10x 5M 150 LED Strip Light 5050 SMD DC12V Red US $348.49
|
 10x5M Non Waterproof 5050 SMD Red 300 LED Strip Lights US $344.99
|
 10x5M Non Waterproof 5050 SMD Red 300 LED Strip Light U US $344.99
|
 10X 5M RED SMD 5050 FLEXIBLE LED Strip Light INTERIOR12V US $311.39
|
 5000x Red Green Blue White Yellow 1206 Bright SMD LED m US $299.00
|
 5000x Red Green Blue White Yellow 1206 Bright SMD LED US $299.00
|
 5X 5m RED SMD 5050 Waterproof Flexible 300 LED Strip B US $264.99
|
 5x 5M 300 LED Strip Light 5050 SMD DC12V Red waterproof US $262.69
|
 5000 pcs PLCC 6 5050 SMD 3 CHIPS Red 6000mcd LED light US $255.00
|
 0603 Red Ultra Bright SMD LED PKG 4000 pcs US $229.50
|
 20x Bright Red CREE Q5 7W SMD LED Auto Tail Brake Park 1157 BAY15D 12V DC New US $224.99
|
 10x 5M Red 3528 SMD LED Strip Lights 300 leds US $223.19
|
 2007 2011 GMC SIERRA 1500 2500 HD FIRE RED SMD LED REVERSE BRAKE TAIL LIGHT LAMP US $218.88
|
 10X 5m Red SMD 3528 Waterproof Flexible 300 LED Strip US $216.65
|
| Powered by phpBay Pro |