[_] (OT) Basic electronics
Stuart Gallemore
stuart.gallemore at gmail.com
Fri Aug 11 14:18:34 BST 2006
I think Ben is the one who is right here. If you have a 25W 240V bulb
it should run straight of the mains.
make sure its not 230V or something silly like that though. You could
try sticking a resistor in series as this would reduce the power a bit
(and the voltage). You'll have to do the maths to get the resistance
of the bulb and plan the resistor to be about a tenth of it or
something to drop a little power. I'm guessing the bulb's resistance
is about 2300 ohms so, you could always get a nice (mains suitable)
variable resistor and stick that in series with it and see what helps.
Failing all that perhaps you do not have a 240V bulb...? Or your mains
supply is very dodgy.
-Stu
it should run straight of the mains.
make sure its not 230V or something silly like that though. You could
try sticking a resistor in series as this would reduce the power a bit
(and the voltage). You'll have to do the maths to get the resistance
of the bulb and plan the resistor to be about a tenth of it or
something to drop a little power. I'm guessing the bulb's resistance
is about 2300 ohms so, you could always get a nice (mains suitable)
variable resistor and stick that in series with it and see what helps.
Failing all that perhaps you do not have a 240V bulb...? Or your mains
supply is very dodgy.
-Stu