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Switching circuit making help?

Discussion in 'General Electronics Discussion' started by Shyamal796, Apr 23, 2012.

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  1. Shyamal796

    Shyamal796

    32
    0
    Mar 19, 2012
    I need such kind of Flip-flop ic or any othe ic, in which i give always input 1 after a certain period and get the output sequentially 0 and 1.

    Is it possible to make this by using T Flip-flop?
    Help
     
  2. Harald Kapp

    Harald Kapp Moderator Moderator

    12,449
    2,981
    Nov 17, 2011
  3. Shyamal796

    Shyamal796

    32
    0
    Mar 19, 2012
    I find one solution using T flip-flop. But have one problem?
     

    Attached Files:

  4. Harald Kapp

    Harald Kapp Moderator Moderator

    12,449
    2,981
    Nov 17, 2011
    7 is an output. Do not connect it to GND or VCC.
    1 and 5 are low active inputs for set and reset. If you do not wan to use these functions, tie these inputs to VCC (pull up). Use a series resistor (e.g. 1kOhm) for pull up, not a direct connection to VCC.

    Note: a direct connection will work in almost all cases, but using a series resistor (pull up) is good practice. It allows you for example to make a connection to GND for test purposes with a piece of wire without short-circuitingb the power supply.

    Harald
     
  5. Shyamal796

    Shyamal796

    32
    0
    Mar 19, 2012
    Thanks Mr. Harald.
    I was confused to connect the pin 1 & 5. But now i will connect this pin to +Vcc with resistor (1K).

    My solved circuit is that i want .......
     

    Attached Files:

  6. gorgon

    gorgon

    603
    24
    Jun 6, 2011
    You should always use a resistor for pullups on TTL and TTLLS logic inputs. This is because the input is drawing current due to the construction of the chip, and you limit this current with a 1k resistor. Never connect TTL inputs direct to Vcc.

    TOK ;)
     
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