[sdiy] Passive ringmod at higher power

[Tim Ressel]

Yo,

The notion of the 'passive' ring mod needing no
external power is incorrect. In fact the circuit is
relying on the external signals being large enough to
turn on the diodes. In RF mixer land, mixers are rated
in how much input power is needed to turn them on.

A concideration for high power operation is
transformer saturation. If this happens, you'll get
clipping of course, but also the currents will go way
up, and the diodes may let out their magic smoke.

--tr


--- harrybissell <harrybissell at prodigy.net> wrote:
> Maybe not 'quite' right...
> 
> with lower impedance transformers, and diodes
> capable of higher
> currents and much larger current available from the
> X source... it could
> 
> be higher power.
> 
> It would be ineffecient, likely... at high power.
> You'd need buffer amps
> 
> to drive it, etc... and the voltage in the ring
> portion has to stay very
> low...
> but the current could be high.  Before you go
> there.. the idea that the
> circuit
> requires 'no external power' will be kind of moot.
> You'll need LOTS of
> power
> at that point. Drive with a stereo amp perhaps ? 
> The ring section will
> take no
> power but the amp sure will.
> 
> At that point, you'd want an active ring mod (or
> passive) follwed by a
> buffer amp.
> Cheaper and better
> 
> (how much power did you WANT anyway ???   :^)
> 
> H^) harry
> 
> Toby Paddock wrote:
> 
> > I had thoughs about using
> > the passive ring mod
> > http://www.synthfool.com/ringmod.html
> > for higher power, but it looks like
> > you're depending on the impeadance of
> > the X source, xfmr, and diodes for
> > it not to burn up.
> >
> > Is that true or am I not looking at it
> > right?
> >
> > Thanks,
> > Toby Paddock
> 


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