DIY parts

[terry michaels]

-------------Forwarded Message-----------------

From:	"<<<marjan>>>", INTERNET:urekar.m at EUnet.yu
To:	[unknown], INTERNET:synth-diy at mailhost.bpa.nl
	
Date:	8/22/98  6:56 AM

RE:	Re: DIY parts

Sender: owner-synth-diy at mailhost.bpa.nl
Received: from mailhost.bpa.nl (mailhost.bpa.nl [193.172.36.4])
	by arl-img-1.compuserve.com (8.8.6/8.8.6/2.12) with ESMTP id HAA29979;
	Sat, 22 Aug 1998 07:56:06 -0400 (EDT)
Received: (from majordom at localhost)
	by mailhost.bpa.nl (8.8.8/8.8.8) id NAA06230
	for synth-diy-outgoing; Sat, 22 Aug 1998 13:50:48 +0200 (MET DST)
Received: from SOLAIR.EUnet.yu (SOLAIR.EUnet.yu [194.247.192.52])
	by mailhost.bpa.nl (8.8.8/8.8.8) with ESMTP id NAA06221
	for <synth-diy at mailhost.bpa.nl>; Sat, 22 Aug 1998 13:50:45 +0200 (MET DST)
Received: from um.eunet (P-199.56.EUnet.yu [194.247.199.56])
	by SOLAIR.EUnet.yu (8.9.0/8.9.0) with SMTP id NAA26957
	for <synth-diy at mailhost.bpa.nl>; Sat, 22 Aug 1998 13:50:15 +0200 (MET DST)
Message-ID: <35DEB02C.17EF at eunet.yu>
Date: Sat, 22 Aug 1998 13:49:00 +0200
From: "<<<marjan>>>" <urekar.m at EUnet.yu>
X-Mailer: Mozilla 3.04Gold (Win95; I)
MIME-Version: 1.0
To: synth-diy at mailhost.bpa.nl
Subject: Re: DIY parts
References: <199808212230_MC2-56F3-9C1C at compuserve.com>
Content-Type: text/plain; charset=us-ascii
Content-Transfer-Encoding: 7bit
Sender: owner-synth-diy at mailhost.bpa.nl
Precedence: bulk

> I chose the integrator type of design for the following reasons.  First,
> the input to the integrator is within a few millivolts of ground potential
> at all times.  This allows you to run a ground ring around everything on
> the input node: the CA3030 pin 2, one end of the timing cap, the source
> lead of the FET, and the collector of the exponential transistor in the
> CA3046.  The ground ring eliminates leakage from elsewhere on the PCB into
> the integrator, and is highly recommended.  Another advantage is the base
> to collector of the exponential transistor is within a few millivolts of 0
> volts.  This greatly reduces leakage in the transistor.  All of those
> things extend the lower range of the oscillator greatly, with no compromise
> to the upper range.  Also the sawtooth ramps up from 0 volts.  The ramp is
> perfectly straight.


Excuse me for my ignorance, but what circuit is in question as
it seems that I missed something.Is it online ?


marjan