White LED Stroboscope

Finally, white LED`s are bright enough to use in a practical stroboscope. This circuit can operate as a bench-top stroboscope that, in conjunction with an oscilloscope or frequency meter and bench top power supply can accurately measure rotational speeds, or it can be operated hand-held from a single 9V battery, using a marked scale to estimate rotational speeds. Its a nice iinstrument to have on or around the workbench. Besides that, its fun to use.
White LED Stroboscope - schematic

Its bright enough to use without dimming the room lights and with the aid of a frequency meter or oscilloscope, can measure rotational frequency to within a few degrees per second. This LED stroboscope is a fairly simple circuit for the similarly simple t

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