It's for a resin burner--frankincense etc--that doesn't have a temperature regulator so it burns too hot. I don't need to know an actual temperature, just to be able to raise/lower the temp'. Thanks.
closed as off-topic by Charles Cowie, Michel Keijzers, Dmitry Grigoryev, DoxyLover, MCG Jun 1 '18 at 10:19
This question appears to be off-topic. The users who voted to close gave these specific reasons:
- "Questions on the use of electronic devices are off-topic as this site is intended specifically for questions on electronics design." – Dmitry Grigoryev, DoxyLover, MCG
- "Questions on the repair of consumer electronics, appliances, or other devices must involve specific troubleshooting steps and demonstrate a good understanding of the underlying design of the device being repaired. See also: Is asking on how to fix a faulty circuit on topic?" – Charles Cowie, Michel Keijzers
If it mains-powered, then most lamp dimmers will work. For example (for US):
You can halve the power by putting a diode in series. Often times this will do it.
Once caveat is if your heater actually uses a PTC heating element. This is quite common for small things you want to not overheat.
It becomes very difficult to lower the temperature by changing duty-cycle, as the PTC is self regulating.