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Countdown Timer 99 Seconds using 89C2051 and 7-Segment | 18,168 view(s)

>Countdown Timer 99 Seconds using 89C2051 and 7-Segment

This is Countdown Timer 99 Seconds using 89C2051 and 7-Segment Electro Suite, with the heart of this circuit is IC MicroController 89C2051.

Switch No. 1 is used for reset to 99 digits, and Switch no. 2 is used for start the timer.

Components

  • C1, C2 = 30 pF
  • C3 = 10 uF
  • XTAL1 = 11.0592 MHz
  • U1 = 89C2051
  • R = 180 Ohm (x 8)
  • R2 = 8,2 K
  • 7-Segment
  • Q1, Q2 = 2N2907
  • 2x 10 K Resistor
  • 2x Switch

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Countdown Timer 99 Seconds using 89C2051 and 7-Segment

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