Path: utzoo!utgpu!jarvis.csri.toronto.edu!mailrus!tut.cis.ohio-state.edu!purdue!gatech!hubcap!ncrcae!wte
From: wte@ncrcae.Columbia.NCR.COM (Bill Eason)
Newsgroups: sci.electronics
Subject: Re: Guitar Sound Effects
Message-ID: <4458@ncrcae.Columbia.NCR.COM>
Date: 5 May 89 13:03:10 GMT
References: <496@hwee.UUCP>
Reply-To: wte@ncrcae.Columbia.NCR.COM (Bill Eason)
Organization: NCR Corp., Engineering & Manufacturing - Columbia, SC
Lines: 36

In article <496@hwee.UUCP> jamieson@hwee.UUCP (T.S. Jamieson) writes:
>	Hello,
>	As part of an hobby to do with sound effects I have hit some problems
>	This involves the actual block diagrams of the sound effects , for 
>	instance I know what a Chorus pedal sounds like but I am not sure how it
>	works . If any one out there has had experience with these devices and 
>	knows how to design them could you send me the information .
>
>	Please reply by E-mail as I am revising at the moment for my finals and
>	there is little time for perusing the News .
>
>		Thank you in advance
>			Stuart Jamieson   , Only 6 exams to go !
>

I am also interested in such sound effects and think they might be of enough
general interest to post to the net.  If you don't think so, then at least
be kind enough to E-mail me a copy of replies, too.  TIA!!!

For my own questions, what are the standard impedances for "high-Z and low-Z"
audio inputs?  I know that there are matching transformers to convert from
the three-pin microphone connectors (low impedance) to 1/4" plugs (high),
but what impedances are they matching?  If I wanted to design some sort of
sound effect box, would I need to match my input impedance with some
external impedance, or would there be any problems using the textbook
op-amp principle of really high input impedance and really low output
impedance?  (I'm not talking about a passive box.)  

TIA again,
Bill

-- 

Bill Eason   (803) 791-6419    ...!ucbvax!sdcsvax!ncr-sd!ncrcae!sauron!wte
NCR Corporation		       ....!rutgers!mcnc!ece-csc!ncrcae!sauron!wte
E & M Columbia   3325 Platt Springs Rd.   West Columbia, SC  29169