digital project

Discussion in 'General Electronics Chat' started by Thomas.R, Apr 10, 2008.

  1. Thomas.R

    Thread Starter Member

    Aug 16, 2007
    20
    0
    hallo,

    I need to make a project for school as i am following evening classes. It has to contain digital building blocks. Anyone a good suggestion?

    Thomas
     
  2. nomurphy

    AAC Fanatic!

    Aug 8, 2005
    567
    12
    You have an eight position rotary switch (why not?), and each position is numbered 1 thru 8. Whichever position the switch is in, you display that number on a 7-segment display. So, position one, the display shows 1; position two, display is 2; etc.

    Do not use zero as a position, nor display a 0 (or anything else that is not 1-8).

    If you want a little more challenge, try a nine position switch.
     
  3. mik3

    Senior Member

    Feb 4, 2008
    4,846
    63
    You can make a simple digital voltmeter
     
  4. beenthere

    Retired Moderator

    Apr 20, 2004
    15,815
    282
    Give us a little help here, T.R. What is a "digital building block"?
     
  5. raffter

    Active Member

    Feb 28, 2008
    113
    0
    Thomas,


    how about a digital potentiometer...
     
  6. scubasteve_911

    Senior Member

    Dec 27, 2007
    1,202
    1
    A digital potentiometer consists of two main parts: quadrature decoder and a binary counter. The binary counter's output is sent to some transistor buffers and some relays, the relays will form a linear branch of resistance with pre-calculated values.

    I did this for a friend once who thought regular potentiometers weren't good enough and were too noisy for his audiophile taste.. We changed the lookup tables to give a logarithmic response, since the linear was really silly.. Of course, I used a microcontroller, but it would be fun to do with gates.

    Steve
     
  7. beenthere

    Retired Moderator

    Apr 20, 2004
    15,815
    282
    You can get Dpots with a log response and an up/down interface.
     
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