sn76477

Discussion in 'General Electronics Chat' started by Ranieri, Jan 25, 2012.

  1. Ranieri

    Thread Starter New Member

    Jan 25, 2012
    4
    0
    Good evening to all, I am just writing to the forum and I have a question, to whom I can respond. I'm realizing that I attach

    http://imageshack.us/photo/my-images/85/schematic.jpg/circuit

    , and would like to know if you can connect and make it work with a keyboard. Thank you who can help me and a dear greeting to all. Ranieri
     
  2. MrChips

    Moderator

    Oct 2, 2009
    11,970
    3,184
    The SN76477 Complex Sound Generator is an obsolete chip and you may have a difficult time sourcing it. I don't know what you mean by "work with a keyboard". The chip primarily uses a lot of RC inputs hence I doubt that it would be easily adapted to digital control.

    I may be wrong about source, check ICS76477 at BG Micro:

    http://www.bgmicro.com/ICS76477.aspx
     
  3. KJ6EAD

    Senior Member

    Apr 30, 2011
    1,380
    336
    The data sheet shows a simple method using a separate resistor for each key but precise frequency control is not achieved by this method and it may not be valid for some keyboards since they don't incorporate simple NO momentary switches.
     
  4. Mark Colan

    New Member

    Feb 18, 2012
    13
    3
    Search for SN-Voice. It is kind of an expanded SN76477 demo box that also features a 1v per octave interface, making it suitable for actual music (instead of just sounds). I'm building one, at least, once I manage to get all the parts. Some are a bit hard to find, but not impossible.