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BCD to decimal convertor

Discussion in 'General Electronics Chat' started by bogdanfirst, Dec 16, 2002.

  1. bogdanfirst

    bogdanfirst New Member

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    well, i know that a 4028 converts from 4 bits to 10 outouts, but i have searched for a circuit that will to the other way around,... :? :?
    convert from 10 inputs(only 1 on H state, the rest L, at a time) to 4 bits..
    i need this for a peralel port circuit..
    hope u can help..i am waiting for an answer.. :shock:
     
  2. mechie

    mechie New Member

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    BCD to Decimal

    How about a simple diode encoder ...

    Input 1 -- diode to output bit 1 (LSB)
    Input 2 -- diode to output bit 2
    Input 3 -- diodes to output bits 1 and 2
    Input 4 -- diode to output bit 3
    Input 5 -- diode to outputs 1 and 3
    ... ... ... blah blah

    Each diode (all cheap signal type) has anode to input, cathode to output.
    This will work as you stated only one input can be high at a time.

    Waiting over (15 mins !)
     
  3. bogdanfirst

    bogdanfirst New Member

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    the ideea is that i dont have enough space for so many diodes, i'll need about 30 of them or so..
    that's why i thought of an ic, maybe something from the 74xx(x) series also...
    but there might be the case of when more than one input is active high, so... :x there;s something else....
    and...ya, i remembered.....anybody knows something like 4028 that does that for 2 bits, or 3, i need both types
    thnx
     
  4. dave

    Dave New Member

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  5. kinjalgp

    kinjalgp Active Member

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    Try 74147: 10 Line to 4 Line Priority Encoder.
     
  6. bogdanfirst

    bogdanfirst New Member

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    thanks!!!!!a lot!
    maybe u can send me a link to a datasheet?
     
  7. grp_bbsr

    grp_bbsr New Member

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    fm receiver

    hi folks,
    i need help in making an fm receiver. any sugesstions or sites will be highly appreciated. thanking u

    grp :)
     
  8. bogdanfirst

    bogdanfirst New Member

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    and another thing, i found the datasheet, but the inputs are active LOW, maybe sb knows one that is active High? :?: :?:
     
  9. kinjalgp

    kinjalgp Active Member

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    No I don't know any other encoder with active high inputs. The problem can be solved using inverters (7404).
     
  10. bogdanfirst

    bogdanfirst New Member

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    :D :D :D thanks for help! :D :D :D
     

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