Roy said:
Petrus, the switch uses the same mains connections as the timer does.
Its a mechanical timer type of switch capable of 12 on/offs per day.
Inside the switch I can see gears and sort of a motor rated 120V 3W
60HZ connected to the mains. If I use a transformer to bring down the
power source to 110V, then the output voltage becomes 110V too. What I
need is to make the timer run on 220V. Need it to control just one
40watt flourescent lamp for my shop. Any ideas?
Roy,
You can connect a resistor of 4kOhm, >3W between the motor and one of the
mains has been connected to. Four 4kOhm, 1W in series will do. Keep in mind
that this resistors become hot. So you have to be carefull where to place
them. It must be impossible to touch this resistors from outside the
enclosure but it also may not melt the enclosure or heat the other content
to much.
As for the switch, the current required by a 40W lamp will not harm it. But
the switch should have been rated for 220V. If it's only rated for 120V it
nevertheless may cause no problem, but you cannot be sure.
BTW. You timer is rated for 60Hz. It may run slower or not at all when you
use it on a 50Hz mains. It also may use more then 3W (so produce more heat)
under this circumstances.
I conclude that you can experiment with it and may be you get it to work.
But be carefull, 220V can be lethal. If you want to have a reliable timer,
you'd better buy a new one.
petrus.