Hi, I've read a lot about this topic both on the web and usenet.
I have a dimmable electronic ballast for fluorescent tubes. It uses a voltage ranging from 1 to 10V as an input for the dimming control. The input is isolated and will absorbe less than 0.6mA of current.
Now, I'd like to build a cheap and space-saving circuit to control this ballast.
I'm considering a transformerless because
1) I can isolate it very well 2) The ballast has its own isolation transformer 3) I need to supply very little current.I live in Italy, 240V AC @ 50Hz.
Which circuit should I use? I was thinking to a 78L10 and a 10KOhm potentiometer to set my output. What about the capacitive reactance and the resistors/diodes in between?
Ciao, Thank you Alessio Sangalli