Flasher for 3021 buckpuck

[Bikecop]

I was thinking about making a wide angle flashing taillight for my bike, using 3 amber or red LEDs. I have a luxdrive 3021 buckpuck driver, and the schematics show it being used with an external flasher driven from the stat and com pins.

Since this is way over my head, I was wondering if there was either a ready made flasher that can be wired into the driver, or if there is someone willing to make me a flasher for a fair price? Can I use the flasher from a 5mm LED taillight for this purpose?

Thanks in advance,

Larry T.

 

[zgurl]

I would be definitely interested in the same type of device

 

[sysadmn]

Does the flasher have to be anything more than a 555?

http://ourworld.compuserve.com/homepages/Bill_Bowden/555.htm#555leds.gif

 

[Riken]

i'd be interested in this as well.

 

[Illum]

Easy with a 555, though its probably not possible without an external power supply if you use a LM555. An ICM7555 CMOS timer might consume less current and allows you to use the 5V Ref pin on the buckpuck [3021/3023-D-E-XXXX]. The 5V pin only has 20ma output, consume too much current and the ctrl pin might not see anything.

Now, start by building a multiviberator circuit. I would recommend for starters:
330 ohm fixed resistor between pin 7 and Vcc
250 ohm variable resistor between pins 6 and 7
10uF capacitor between pins 1 and 2
Put a jumper between Pin 3 and buckpuck's Ctrl pin and your set. If the buckpuck's ctrl pin sees 5V, it will turn off. So on the oscilloscope its not the peaks causing the flashes but instead the troughs. Connect the 555's ground pin to input ground.

You can control the rate of strobe by adjusting the pot, slap on a 1K precision trim if you are really stingy on accuracy.