for info ,   anyone used or seen  this

i'm just about to start digging on my renshaw' probes , a bit more

On 8 September 2016 at 17:07, Jon Elson <> wrote:

> On 09/08/2016 09:56 AM, Florian Rist wrote:
> > Hi Jon
> >
> >> Yes, I thought about building a receiver out of various
> >> parts, but there are application specific parts that combine
> >> all this in one unit.  Most are made with 38 KHz band pass
> >> filters for VCR remote controls,
> > Yes, that's why I didn't even look into theses integrated devices.
> >
> >> but the QSE159 does not
> >> have the BPF, looked to be sensitive enough, and was really
> >> cheap ($1.06)
> > Indeed, interesting.
> >
> > Not sure if it is sensitive enough, 0.25 mW/cm² worst case translates to
> > 2.5W/m², that's quite a lot. But, now that I started looking, there are
> > quite a few similar integrated devices available, some with much high
> > sensitivity down to at least 10µW/cm². However most are lacking the
> > Schmitt-trigger of the QSE159, nice part, that you found, I'm going to
> > get one, too.
> >
> >
> I have no idea what the radiated power of the Blum probe is,
> but it has 12 big surface-mount LEDs arranged around the
> periphery.  The QSE sensor picks it up very well out past
> 6", which is all the sensitivity I will need.
> Jon
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