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Recent content by yingyingong

  1. Y

    power on reset circuit

    i've design a digital clock circuit using counter, decoder and flip flop. however, i need a power on reset circuit. the circuit is to reset the time to 00 seconds everytime the button of the power on reset circuit is pressed. anyone know how to design the circuit?
  2. Y

    [SOLVED] 1 Hz clock pulse for digital clock

    if follow the the nixie clock generator, 4013 cannot connect to 74LS393 and the rest of the circuit which are TTL. am i correct? therefore, i've connected the pin 3 of 4060 to the CLK if 74161 and Qa will be 1Hz right? can this work? and how can i calculate the value for the capacitor and...
  3. Y

    [SOLVED] 1 Hz clock pulse for digital clock

    this is the circuit that i've drew? can anyone tell me where i did it wrongly? how bout the one using 4060? is there any full circuit that i can refer to?
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    [SOLVED] 1 Hz clock pulse for digital clock

    but the rest of my design is using TTL. if i'm using CMOS, is there anyway to connect it to run my TTL ICs that i've designed?
  5. Y

    [SOLVED] 1 Hz clock pulse for digital clock

    how to design a circuit that uses TTL ICs to generate 1Hz clock pulse for digital clock? all the design that i found are using CMOS. anyone can help? thanks in advance
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    1hz pulse generator from 50hz AC power supply

    anyone know how to create a 1Hz pulse from 50Hz AC power supply? it is used for the CLK input of a digital clock thanks in advance
  7. Y

    shift register using D flip flop

    anyone know how to build a shift register with negative edge D flip flop connected to 8 LEDs? once it lights up the 8th LED, it will start over again and light up from the 1st LED
  8. Y

    help on making 60 blinking LEDs

    thanks for the help. finally i get 60 blinking lights. However, when i try to reset it and make it start all over again at 61st second, it wouldn't. it will only start again during the 65th second. i connected the last output which is LED60 to one one the reset of the 1st 7493. what should i do...
  9. Y

    help on making 60 blinking LEDs

    may i know what IC to use as the new counter?
  10. Y

    help on making 60 blinking LEDs

    i have design a circuit of 60 blinking LEDs. however, i don't know what IC to add in to choose only one LED blink at a time. and the circuit will reset and start from LED1 after the 60th LED blink. one 7493 is used and four 74154 are used for the 60 blinking LEDs. what else should i need to...
  11. Y

    light up 10 LED one after another

    actually i plan to light up 60 LEDs for a minute. each second one LED will light up. if is 30 seconds then 30 LED light up. but i'm not planning to use microcontroller
  12. Y

    light up 10 LED one after another

    how to connect the serial in parallel out shift register to the counter and decoder diagram? if i'm using 7490 and 7442 IC
  13. Y

    light up 10 LED one after another

    anyone can help me on how to light up 10 LEDs one after another sequentially?(after 10 pulse all will light up) which decoder should i use if IC 7490 decade counter is used?
  14. Y

    help on building a digital clock without PIC

    anyone know how to connect the circuit to light up 20 LEDs using 7490 counter and 7442 decimal decoder and simulate using proteus?
  15. Y

    help on building a digital clock without PIC

    jpanhalt: my idea is to light up LEDs one by one for every second and the LEDs will turn off one by one after the first minute and light up one by one again for the next minute and so on.
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