Homebrew Vactrols

[Harry Bissell]

The most efficient combination is the one where the spectral peaks
match...
LEDs (most of them) have a fairly narrow peak. So green might work for
some...
red for others...

BUT don't forget "photometry". things like the angle of the radiation of
the LED
will make a big difference... and the MOST importany point... intensity
varies with the
square of distance. Thats for a point source which
radiates in all directions...  The real LED may be better (reflector and
lens added)

Any photons that don't strike an active area are wasted !!!

H^)

">>>marjan<<<" wrote:

> > CdS has two humps, one in red , one in green.
> >
> > So green or red leds work. Red is more efficient.
> >
>
> Some guitar effects I saw, used yellow LEDs (like
> Roger Mayers'  phaser).
>
> marjan