jhaible at debitel.net
Sat Aug 31 20:43:15 CEST 2002
If you don't mind using a handfull of opamps for the control circuit,
a LM13700 makes a nice compander.
See the schematics of my Frequency Shifter for details. (The compander
is similar to the circuit in the Elka Synthex Chorus, btw.)
Von: Craig Critchley <craigc at nwlink.com>
An: <synth-diy at dropmix.xs4all.nl>; Scott Stites <scottnoanh at peoplepc.com>
Gesendet: Dienstag, 27. August 2002 07:17
Betreff: Re: [sdiy] Companders
> That Corp. has the THAT4301 analog processor, which contains an RMS
> detector, an exponential VCA and three opamps (one is dedicated as a
> current-to-voltage converter for the VCA). The primary purpose for it is
> audio compressors. Its several building blocks on a chip, rather than a
> purpose-dedicated device, so it might be more flexible.
> Unfortunately That only sells multiples of 20 (one tube), and they aren't
> distributed through any of the normal online distributors that I'm aware
> They are also more expensive, in that quantity, that the SA571 price you
> found, but it is designed for audio rather than telecoms, so it may have
> better specs.
> Another possibility is Analog Devices's SSM2165 and SSM2166, which are
> microphone preamps that include compressor circuits. I think those can
> be used as compressors, though, and I don't think they're cheaper.
> ----- Original Message -----
> From: "Scott Stites" <scottnoanh at peoplepc.com>
> To: <synth-diy at dropmix.xs4all.nl>
> Sent: Monday, August 26, 2002 2:49 PM
> Subject: [sdiy] Companders
> > Hi All,
> > I was doing some casual checking on compander chips. I
> > noticed that Small Bear Electronics has the DIP version
> > of the SA571 for $4.50.
> > Electronic Goldmine has the surface mount version of
> > the SA571 for $0.49.
> > I was wondering if there are other current production
> > compander IC's out there? Are there any schemos of
> > companders built from discrete components that anyone
> > might have to share?
> > Thanks,
> > Scott
> > ________________________________________________
> > PeoplePC: It's for people. And it's just smart.
> > http://www.peoplepc.com
More information about the Synth-diy