FWD:Re: [sdiy] 2 Diode ring modulator rough designs - request advice

[Scott Gravenhorst]

I don't know what happened, but I never saw this posted
to the list, so I'll try once more.

------- FORWARDED MESSAGE FOLLOWS -------

Sorry about that, I hit the wrong button.

Looking at the basic circuit I got (Jaroslav Lukesh) was marked:

C(t)                     Um(t)
[Um(t)]  on the right    [C(t)]  on the left

and the resistors forming a voltage divider were marked U2(t)

I took 'C' to mean carrier, but now I realize this might not
be true since it was written in a language I don't understand.

In the transformer one on the same page, the center taps of the
transformers is labeled C(t), the windings on the other side
of the transformers are marked Um(t) and U2(t).

Are you saying that the two "U" connections are inputs and the
"C" connection (center taps) is the output?

I've never played with this, but since carrier and input can often
be swapped, I interpreted it this way.

Then I looked around for examples of other transformer ones and
can't seem to find them now.

Thanks.

"John L Marshall" <john.l.marshall at gte.net> wrote:
>Aren't your "Y" input and output swapped?
>
>
>Take care,
>John
>---------------------------------------------------------------------------
>Pacific Northwest DIY Synthesizer meeting, July 20, 2002
>See: www.sound-photo.com
>---------------------------------------------------------------------------
>
>----- Original Message ----- 
>From: "Scott Gravenhorst" <music.maker at gte.net>
>To: <synth-diy at dropmix.xs4all.nl>
>Sent: Saturday, July 20, 2002 11:55 AM
>Subject: [sdiy] 2 Diode ring modulator rough designs - request advice
>
>
>> http://home1.gte.net/res0658s/diode_ring_modulators.html
>> 
>> There are two rough designs here.  One uses transistor phase
>> splitters, the other uses 4069 inverters in linear amp mode
>> to achieve the required inverted and non inverted copies of
>> the input signals.
>> 
>> What I see in the 4069 design is an issue with current flow
>> through the diodes (and drive MOSFETs) on input X.  I am not
>> terribly concerned about distortion.
>> 
>> Should I put small series current limit resistors to feed
>> the X side of the ring?
>> 
>> In the discrete design, should I power this with a dual supply?
>> 
>> Any other comments regarding design flaws?
>> 
>> Opinions on which has a better chance of working at all?
>> 
>> 
>> Thank you for your time.
>> 
>> 
>> =========================================================  
>> - What good are laws that only lawyers understand?
>> - Government: The other religion.
>> - The media's credibility should always be questioned.
>> - Lambs who lie down with lions are lunch.
>> 
>> -- Scott Gravenhorst | LegoManiac / Lego Trains / RIS 1.5
>> -- Linux Rex         | RedWebMail by RedStarWare
>> -- FatMan: home1.GTE.NET/res0658s/FatMan/
>> -- NonFatMan: home1.GTE.NET/res0658s/electronics/
>> 
>> 
>

=========================================================  
- What good are laws that only lawyers understand?
- Government: The other religion.
- The media's credibility should always be questioned.
- Lambs who lie down with lions are lunch.

-- Scott Gravenhorst | LegoManiac / Lego Trains / RIS 1.5
-- Linux Rex         | RedWebMail by RedStarWare
-- FatMan: home1.GTE.NET/res0658s/FatMan/
-- NonFatMan: home1.GTE.NET/res0658s/electronics/