Fw: [sdiy] Passive Ring Modulator

[John L Marshall]

Choose resistors to match the desired impedance. How much current can the
two sources deliver? And at what voltage? 1k ohm each?

I would expected the resistor versions to have substantial losses, burning
most of the power in the resistors, delivering little to the output. But
then, all of the transformers issues go away.

I like the idea of two resistors and a center trim pot to balance the
circuit. Pick your favorite frequency to zero the trim pot.


Take care,
John
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Pacific Northwest DIY Synthesizer meeting, July 20, 2002
See: www.sound-photo.com
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----- Original Message -----
From: "Scott Gravenhorst" <music.maker at gte.net>
To: <synth-diy at dropmix.xs4all.nl>; <uzs159 at uni-bonn.de>
Sent: Thursday, July 18, 2002 5:25 PM
Subject: Re: Fw: [sdiy] Passive Ring Modulator


> I like the transformerless ones.  Questions:
> 1) any clues as to the resistor values? (range?)
> 2) what performance difference is there between xfmr and non-xfmr?
> 3) the resistors Rx, should this be 2 resistors and a trimpot?
>
> I realize that the resistor method would need opamps under most
> circumstances to get inverted and noninverted copies of the input
> signals which defeats the "no power" aspect, but it does eliminate
> the 1496 or whatever.  I would like to experiment with a 4069 operated
> as linear amps for that, I like the way they distort.  one 4069 would
> be enough with 2 inverters left over.  The 4069 would have to be run
> off of a dual supply (+/- 7.5 volts, technically, but I've done this
> with +/- 8 and have heard of it done with +/- 9)
>
>
> René -- might this one work for your simple squaring circuit?
>
>
>
> =?iso-8859-1?Q?Ren=E9?= Schmitz <uzs159 at uni-bonn.de> wrote:
> >--=====================_1027029223==_
> >Content-Type: text/plain; charset="iso-8859-1"
> >Content-Transfer-Encoding: quoted-printable
> >
> >
> >Some nice ringmodulator circuits. Especially picture 40 b, leads to=20
> >a transformerless implementation.
> >
> >Cheers,
> > Ren=E9
> >
> >>Reply-To: <lsh at wo.cz>
> >>From: "Jaroslav Lukesh" <lukesh at k-net.cz>
> >>To: "Ren=E9 Schmitz" <uzs159 at uni-bonn.de>
> >>Subject: Fw: [sdiy] Passive Ring Modulator
> >>Date: Thu, 18 Jul 2002 20:57:15 +0200
> >>X-FeelingPriority: Normal
> >>X-Mailer: Muj vlastni Mail klient 1.00    =20
> >>
> >>There I was post, but my mails does not arrive to synth-diy. Try these.
> >>
> >>It is very little known ringmod solutions (and very easy).
> >>
> >>Regards JL.
> >>
>
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