sci.electronics.basics
Re: Using a photoresistor and light to turn a transistor OFF... -
On Oct 9, 2:38?pm, John Fields <jfie..._at_austininstruments.com> wrote:
> ---
> While Petrus' suggestion to use the PV array as the sensor is
> excellent, it has the drawback that setting the switching point and
> getting a nice "snap" into the LED is difficult, if not impossible,
> using a single transistor.
Here's how those cheap garden lights do it:
http://www.talkingelectronics.com/projects/SolarLight/SolarLight.htm
If the application is for outdoors then the PV is all over the map, so
the better ones use an LDR.
Written by Fred Bloggs
10/10/2011 5.14.09
Check some pics on this site!
25/05/2012 19.24.46