Re: IR detector system, biasing of photo diode

On 29/10/2024 11:19 am, Phil Hobbs wrote:

On 2024-10-28 08:14, piglet wrote:

john larkin <JL@gct.com> wrote:

On Sun, 27 Oct 2024 22:59:59 -0000 (UTC), piglet
<erichpwagner@hotmail.com> wrote:
>

Klaus Vestergaard Kragelund <klauskvik@hotmail.com> wrote:

On 27-10-2024 13:26, Klaus Vestergaard Kragelund wrote:

On 27-10-2024 03:26, john larkin wrote:

On Sun, 27 Oct 2024 02:19:14 +0200, Klaus Vestergaard Kragelund
<klauskvik@hotmail.com> wrote:

<snip>

Of course they might be able to reverse the process and have one receiver
on the robot and two emitters on the docking station, a bit like aircraft
VOR

 Or like certain radio navigation systems popular in Western Europe, 80 or so years ago. ;)
 That's a good example of Horace Darwin's maxim, "Always try it the other way round", quoted in "Instruments and Experiences" by R. V. Jones.
 Jones is one of my technical heroes, and was instrumental in defeating a couple of the aforementioned navigation systems, specifically "Knickebein" and "X-Geraet", as explained in his book, "The Wizard War" (entitled "Most Secret War" in the UK).  Horace Darwin was a grandson of Charles Darwin, and a colleague of Jones's at Aberdeen after the war.

Horace Darwin - Charles Darwin's youngest son - founded Cambridge Instruments where I worked from 1982 to 1991. He died in 1928.
https://en.wikipedia.org/wiki/Horace_Darwin
One of the people I worked with had seen his WW1 patent applications, most of which involved a lot of string, when the company history files were being moved to a new site.
I actually knew one of Charles Darwin's grandsons, when he was a professor at Sussex University. If there was a Horace Darwin in his generation, Google doesn't know about it.
https://www.sussex.ac.uk/profiles/652
--
Bill Sloman, Sydney