An Instructables member wanted to make emergency flashers for his truck out of Luxeon Star high powered LED lights or something like them. He wanted the lights to flash left, right, left, right, and if he could get them to stay on when he wanted them to. So the first thing I did was to go to Luxeon Stars website and down loaded the datasheets on their high powered LEDs and drivers.
I came up with a simple 555 timer clock to a JK Flip Flop controller to flash the LEDs left to right and back. I chose the 555 timer because it is the easiest multivibrator to get and use by novices but any multivibrator will do.
Step 1: The First Circuit Evolution
To the circuit I added an on indicator LED, LM7805 voltage regulator and high speed diodes to isolate and protect the circuit from power surges and feedback.
Step 2: The First Prototype
Step 3: Parts
1 - LM7805 voltage regulator
1 - NE555 timer
1 - SN74LS73A JK Flip Flop
2 – FR151 diodes
2 – 2N3906 transistors
You can get the diode and IC datasheets at:
From your local Radio Shack or on line electronics store get:
1 – breadboard for testing
1 – protoboard
1 – switch
1 – Green LED
1 – 50k ohm pot (Variable Resistor)
2 – 150 ohm ¼ watt resistors
3 – 1k ohm ¼ watt resistors
1 – 220uF 16 volt electrolytic capacitor
1 – 4.7uF 16 volt electrolytic capacitor
2 – 1uF 16 Volt electrolytic capacitors
And lots of wire
I always get extras just in case I need them.
Step 4: Then Test the Circuit.
I included drawings of the components for novices in electronics to make things easier for them to construct the circuit themselves.
Step 5: Optocouplers
Optocouplers come in analog and digital ICs packages consisting of 1, 2, 3, and 4 couplers and a variety of voltages and powers.
Step 6: The Finished Left Right Flasher
The Luxeon Star LED driver to use with this circuit is the six wires dimmable driver for strobe function you connect a 2N3904 transistor collector to Dim wire and emitter to dim ground wire and base to in coming signal.
For this function I replaced the 2N3904 with an optocoupler capable of carrying the same current, now the signals are carried by light and there is little chance of feedback or power surges damaging the signal circuit from the Luxeon Star LED driver.
To the parts list add K815P optocoupler, can be purchased at Mouser.
Step 7: Luxeon Star High Power LEDs
The datasheets and videos take you through the construction of the high powered LEDs and wiring the LED drivers. For flashers you need the dimmable LED drivers connected for strobe as shown in these picks.
Step 8: Stepping Things Up One
To the parts list add a 100k ohm pot, a K845P optocoupler, and SN74LS08 And gate, both And gate and optocoupler can be purchased at Mouser.
Send the 555 timer clock pulse to the first JK Flip Flop and one side of all four of the two input And gates. From the first JK Flip Flop connect the Q to the second Flip Flops clock. From the second Flip Flop connect Q to two of the And gates second input and the Q to the other two And gates second input. Connect the set of the JK Flip Flops to the 5 volt power now when you connect the LEDs up to the And gates the same way as in the Left Right Flasher, they flash Right, Right, Left, Left, and back.