[sdiy] Passive Ring Modulator

cyborgzero at comcast.net cyborgzero at comcast.net
Fri Jul 12 23:43:25 CEST 2002

Yes, I am *definitely* interested in this two diode ring approach,
since the key issue with passives is they fact that they have a
problem with carrier rejection. Anything that would increase that
would be good in my book. ;)


----- Original Message -----
From: "Steve Begin" <Steve.Begin at pwgsc.gc.ca>
To: "Synth (E-mail)" <synth-diy at dropmix.xs4all.nl>
Sent: Friday, July 12, 2002 12:29 PM
Subject: RE: [sdiy] Passive Ring Modulator

> Awesome!  I found a 42TL028 transformer on mouser.com hopefully that
is the
> same thing.  I will try to order a few. Thanks a lot!
> How is the second diode ring connected in the design you have?
> Steve Begin
> -----Original Message-----
> From: ian [mailto:deviant at custard.org]
> Sent: Friday, July 12, 2002 12:55 PM
> To: Steve Begin
> Cc: Synth (E-mail)
> Subject: Re: [sdiy] Passive Ring Modulator
> Hi Steve,
> I have a boxful of ringmods much like this sitting on my desk right
now! I
> haven't had a chance to try them out yet, but other people who have
> them say they sound great. The design I have was given to me by a
> colleague, and it comes from the Amateur Radio Relay League
handbook. It
> differs slightly from the one on sonicstate, as it has two diode
> which is supposed to provide better carrier rejection than the
> diode ring design. As for the transformers, the ringmods I have use
> from Mouser, marked TL028 down one side and 0109S down the other.
> Ian
> On Fri, 12 Jul 2002, Steve Begin wrote:
> > Hi, I'm new to the list, not new to analog (am I gonna get in
trouble if I
> > spell it like that?)
> >  gear, but fairly inexperienced when it comes to circuitry.
> >
> > I've got a question, has anybody had any experience with a passive
> > modulator design like this one?
> > http://www.sonicstate.com/synthfool/ringmod.html
> >
> > I'm interested in it since it looks very easy to make and cheap
and if it
> > doesn't work as well as other designs it doesn't bother me that
> > However,  I guess the stancor a-4713 driver transformers are no
longer in
> > production and I can't seem to find anything information on them
at all,
> let
> > alone a reference to a part I could use as a substitute.
> > I'd really appreciate it if somebody could give me any direction
at all
> > here.
> >
> > The other thing I was wondering about (and I'm sure it's probably
> painfully
> > obvious to a lot of you) was half or full normalled patch bays.
When you
> > split a signal doesn't it affect the impedance or something along
> > lines?  I thought it would be a bad thing to do but I haven't seen
> > mention any problems with that.
> > How about combining signals without a mixer?  I'm almost positive
you get
> > problems doing that.
> >
> > Thanks!
> >
> > > Steve Begin
> > >
> > >
> > >
> >

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