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The ultimate anti-speaker pop circuit

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  • The ultimate anti-speaker pop circuit

    The other night at 2 am while drunk I came up with the idea for a circuit to turn the amp / speakers on and off, via the computer.

    Nothing out of the blue, you say, but here's the cunning part it connects to your LPT and works even if you've got a HD44780 character LCD connected to your printer port.

    Here's the link

    Rob

    edit: might help if I typed the link correctly the first time
    And you say people actually pay money for M$ Windows?
    www.mp3mini.co.uk (Does what it says on the URL) www.openclassic.co.uk (The new car, with zero rust!) www.rob-web.co.uk (My other site)
    Total re-design underway: on the whole progress is very slow as the car is taking up too much time :)

  • #2
    brilliant! If only I wasn't a moron when it comes to making things

    Now when you shutdown your computer you don't generally run a command to shut down... how would you execute the second command? If you don't execute it.. the speakers will just stay "on" won't they?
    aka Kumaneko
    "Don't make me moderate your ***!"
    Maxima of Doom - project thread - photo gallery
    mp3car system is currently FUBAR and finances do not allow for a correction of that situation
    Real computer hackers use a rotary cutting tool on their motherboard.

    Comment


    • #3
      You can get windows to run programs on shut down, I forget where the option is, or you can use a batch file.

      Originally posted by ShinkunoNamida
      brilliant! If only I wasn't a moron when it comes to making things
      It's just a case off using enough liquid stimulus (beer)
      And you say people actually pay money for M$ Windows?
      www.mp3mini.co.uk (Does what it says on the URL) www.openclassic.co.uk (The new car, with zero rust!) www.rob-web.co.uk (My other site)
      Total re-design underway: on the whole progress is very slow as the car is taking up too much time :)

      Comment


      • #4
        u can do alot when fueled by beer..... very nice little circuit...


        I can see other uses besides just speaker switching...... maybe an electric antenna? etc ? etc?


        if u want someone to bash out some w32 .exe's from visual basic PM me and I will knock some up to include on your page....
        Project - GAME OVER :(

        Comment


        • #5
          according to
          http://www.doc.ic.ac.uk/~ih/doc/lcd/instruct.html
          The MSB is somehow required too.
          however, there is one more trick...
          the HD44780 LCDs require 3 control signals (see http://www.doc.ic.ac.uk/~ih/doc/lcd/...ple/conn1.html ).
          the Parallel port has 4 signals available.
          (as explained in http://www.doc.ic.ac.uk/~ih/doc/par/ )
          Thus, you can have the best of both worlds...

          Sincerely

          Amaury
          I don't need no stinkin' startup-shutdown controller... That's what journalized filesystems are for...
          NavSys, the ultimate navigation app
          http://www.navsys.org/

          Comment


          • #6
            You can quite happily drive an HD44780 controller with only 4 data lines and a couple of control lines. I do this to keep my wire count down. That gives you loads of spare lines - I use two to drive my aux-in switch on my headunit.


            Rob
            Old Systems retired due to new car
            New system at design/prototype stage on BeagleBoard.

            Comment


            • #7
              Originally posted by Rob Withey
              You can quite happily drive an HD44780 controller with only 4 data lines and a couple of control lines. I do this to keep my wire count down. That gives you loads of spare lines - I use two to drive my aux-in switch on my headunit.


              Rob
              Wouldnt that only drive a single line? I dont know Im just guessing. Could I do this to drive a 2x16 HD44780? Any chance of the pin outs?
              -------------------------------------------
              (=========-) 99% complete
              --------------------------------------------
              AMD K6/2 500 @ 450mhz to keep heat and power usage down, 64Mb, slim CDrom drive, 64mb USB pendrive for MP3 transfer, 10Gb 2.5" drive for MP3, USB>RS232
              All jammed in external CDROM drive case.
              Kenwood KVC-1000r In-Dash LCD. x-10 MouseRemote. Destinator V2 Gps. DC-DC with onboard Shutdown controller.
              ----------------------------------------------

              Comment


              • #8
                You need to write a special driver for the HD44780, then use only D4-D7. Just read the data sheet for the HD44780.

                Try this: http://www.doc.ic.ac.uk/~ih/doc/lcd/initiali.html


                Rob
                Old Systems retired due to new car
                New system at design/prototype stage on BeagleBoard.

                Comment


                • #9
                  In the Mark Zwhatever winamp plugin which I am using it has a 4-bit option. Is this what I want to use, then just remove the unused data lines?
                  -------------------------------------------
                  (=========-) 99% complete
                  --------------------------------------------
                  AMD K6/2 500 @ 450mhz to keep heat and power usage down, 64Mb, slim CDrom drive, 64mb USB pendrive for MP3 transfer, 10Gb 2.5" drive for MP3, USB>RS232
                  All jammed in external CDROM drive case.
                  Kenwood KVC-1000r In-Dash LCD. x-10 MouseRemote. Destinator V2 Gps. DC-DC with onboard Shutdown controller.
                  ----------------------------------------------

                  Comment


                  • #10
                    Possibly. I don't know for sure, I didn't write it.


                    Rob
                    Old Systems retired due to new car
                    New system at design/prototype stage on BeagleBoard.

                    Comment


                    • #11
                      Originally posted by Rob Withey
                      Possibly. I don't know for sure, I didn't write it.


                      Rob
                      Hmm, Ill give it a go, it cant do any harm. Cheers anyway.
                      -------------------------------------------
                      (=========-) 99% complete
                      --------------------------------------------
                      AMD K6/2 500 @ 450mhz to keep heat and power usage down, 64Mb, slim CDrom drive, 64mb USB pendrive for MP3 transfer, 10Gb 2.5" drive for MP3, USB>RS232
                      All jammed in external CDROM drive case.
                      Kenwood KVC-1000r In-Dash LCD. x-10 MouseRemote. Destinator V2 Gps. DC-DC with onboard Shutdown controller.
                      ----------------------------------------------

                      Comment

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