I intend to build a simple dawn simulator for my wife. She likes the idea of waking up to the increased brightness of the bedside lamp rather then the alarm clock noise, and that sounds good to me :)
I'm thinking basics here: an off-the-shelf household timer (to set the wakeup time) and a custom dimmer circuit that brings my lamp from 0 to 100% in, say, in 20 minutes time or so.
I've looked around all the usenet groups for directions on how to build this thing: most of solutions points to various home automation solutions. That might work fine, but I'd like to put my old soldering iron to use again - it's about time :).
The problem is that I can't find a detailed schematic description. There are references to alt.binaries.schematics.electronic but nor Google or my ISP allows access, so I can't see if that would do it.
I plan to use Bill Bowden's (url below) dimmer circuit schema, I just need some help with the dimensions of the diodes and some capacitors. I've put the schema up, with all items marked, at:
Anybody that can suggest roughly which diodes to use? BTW: do you expect this solution to be noisy?
Thanks, ..fredrik