Is there anyone willing to share a schismatic of how to put together a small board with the LEds for the rangefinder. I really want to build it myself to keep my costs down but am unsure of the resistors needed. Thanks guys.
you can use this calculator to know how big of a a resistor you need
but only if the leds draw the same voltage and forward current LED series parallel array wizard
For example i have 3 leds running in a parallel circut ,
Eatch draw 1.5 to 2v and their forward current is 20mA ,
so if i use a 9v battery i need a 150 ohms resistor.
also if you want some blinking red leds on top of the rangefinder you can get some that works without having a timer on your circut [SIZE=-1]MSB557DA datasheet[/SIZE]