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  1. wiparat

    Countdown timer with alarm

    Thank you for your comment. I do not know if it's obsolete. I think this circuit is interesting. but is a little idea to apply many circuits.
  2. wiparat

    Countdown timer with alarm

    This circuit is IC implementation schedule. No. 555 applied with IC number LM3905.By the IC to the number 555 are the circuits Stable multi-vibrator. How often do produce it.This frequency is then forwarded to the scheduling with the integrated circuit number LM3905. When entering the power...
  3. wiparat

    random number by led one digit

    Thank for comment.  I think ic NE555 is small and low cost, it easy to use.
  4. wiparat

    coin toss electronics by ic ne555-cd4017

    Your idea are very good.  Ic 74HC74 is small, but sure.  Thank you.
  5. wiparat

    coin toss electronics by ic ne555-cd4017

    This is a review of electronic sound or a violent coin toss. With electronic circuits. This circuit uses integrated digital IC NE555 and CD4017 with LED display easily. Principle of the circuit, when voltage is 5 volts to the circuit C1 will charge through the VR1 and R1 fully. IC1, R2, R3 and...
  6. wiparat

    random number by led one digit

    This is a circuit diagram showing the random nature of LED 7 segment. In the diagram circuit IC1
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