I've been searching the web for a few answers but this seems to be the best place to get help and advice on electronics circuits. I've inherited an old microscope which I'd like to get working again. The optics are still very good but the dimmer for the lamp is of a very old rheostat design and is not very reliable. I'd like to replace it with a more efficient alternative. I think a trailing edge dimmer circuit would be the best option to help protect the lamp from sudden voltage changes. The lamp is rated 6V AC 15W and I'd like to run it off 240V AC mains in the UK. I can find a commercial AC-AC PSU (either 24, 12 or 9V) but would like to include a dimmer circuit that didn't include just a potentiometer. Can anyone suggest an appropriate trailing edge dimmer circuit that would drive this lamp? Any help or suggestions gratefully received. Thanks in advance.