I've seen graphs of the effect of the duty cycle, but not refresh rate.
Peak forward current(Duty Cycle=1/10, 10KHz) = 30mA
digitalWrite(place + 2, HIGH); //turns on the digit (again, lazy: 0th digit is digital pin 2) delay(4); //digit stays on for 4ms digitalWrite(place + 2, LOW); //turns of the digit
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