Re: Turntable Stroboscope
Your output circuit is far too complicated. Use a 1k resistor to the base, (no capacitor), use a simple transistor with emitter connected to ground, put the LED in series with the collector resistor. If you need a lot of current use a n channel FET, there is plenty of voltage to drive it.
No diodes are needed but a capacitor across the chip power supply would be good.
White LEDs use fluorescence, I do not know whether they have a long time constant
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