Hooking PC speaker to stereo (again)

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Article #4559

#4559

From: Randy Spangler
Date: Tue, 10 Apr 1990 18:40

28 lines
1395 bytes

Ok, I've tapped the two wires to my speaker, with 1uF capacitors in the
middle.  But when I hook these (either way) into my keyboard mixer, I get
this loud hum (guessing 60Hz) that swamps the actual sounds playing through
the speaker.  Should I have a connection to ground somewhere in here?  If 
not, what's the cheapest and simplest way to kill the hum with a filter or
the like?


(from computer)
BLACK    YELLOW
  |         |
  |	    |
  |	    |
  |	    +----------------||----------------
  |	    |             1uF caps             to keyboard
  |	    |             (ceramic)            mixer
  +--------------------------||----------------
  |	    |
  |         |
(to 8-ohm .25W speaker)



-- 
 --------------------------------------------------------------------------
|    Randy Spangler                    |    The less things change, the    |
|    rspangle@jarthur.claremont.edu    |    more they remain the same      |
 --------------------------------------------------------------------------

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Path: arc1-ca.pugleaf.net!utzoo!attcan!uunet!samsung!brutus.cs.uiuc.edu!jarthur!rspangle
From: rspangle@jarthur.Claremont.EDU (Randy Spangler)
Newsgroups: sci.electronics
Subject: Hooking PC speaker to stereo (again)
Message-ID: <6053@jarthur.Claremont.EDU>
Date: 10 Apr 90 18:40:30 GMT
Distribution: na
Organization: Harvey Mudd College, Claremont, CA 91711
Lines: 28