Id like to build a small test tube heater with nichrome wire. Where do I start?

I would like it to be variable from ~100C-400C and have minor experience in electronics.

iceng2 years ago
Take an old toaster apart for the nichrome wire and wind it around a ceramic tube that can accept your Pyrex test tube.

Power the tape from a variac or phase lighting controller through a step-down transformer 120:40 and start heating.

To maintain a temperature get an omega PID control.

And it wouldn't hurt to wrap glass fiber insulation around the heater.

iceng iceng2 years ago
BTW solder wont work, use ceramic wire twists or split bolts
to connect copper to nichrome..
frollard iceng2 years ago

And as always with electricity; even a third of line voltage can be dangerous if not respected; if in doubt, don't touch a running circuit because the energized nichrome will happily conduct current as well as heat into a human body :D Always unplug before adjusting.