I have just recieved a sample of the QT113 chip from Quantum. I've been playing around with sensitivity etc and they are a real development, I have been using capacitive switches for house lighting etc these have been run from a 12vDC power supply which also runs a 12vDC relay for switching the 240v.

I want to replace any currently mechanically operated switches that remain in a home with a QT113 circuit.

Whilst I have the circuit figured out, I wonder if someone can suggest a way I could adapt the 240vAC feed to the existing switches into a supply of 2-12vDC easily, I am familiar with using the 805 regulators but need to drop the voltage and switch to DC 1st. I need it to be a fairly small physical size conversion because of the limitation of space behind existing switches. I don't want to use pre-manufactured regulated adapters and have to run that supply to each switch I want to utilise the existing lighting supply.


Any help would be appreciated....................

 

Is this -

http://www.maplin.co.uk/Module.aspx?...rmer&doy=10m12

and this -

http://www.imagineeringezine.com/PDF...240VAC5VDC.PDF

what I need to be doing? Or Is there a way to go even smaller?

 

Anyone??

 

this may be of some use

http://ourworld.compuserve.com/homep...tm#lineled.gif

__________________
If you don't have a planet, what good are gold bars?

want to contact me directly? gmail gordonthree
check out my project website: http://projects.dimension-x.net
Favorite numbers:
09 F9 11 02 9D 74 E3 5B D8 41 56 C5 63 56 88 C0

 

Thanks!! I'll have a play around with that circuit. That would reduced the size considerably.

Cheers