- Sep 20, 2013
I do have a very tiny temperature probe. But, I don't know if I could access the heater to get close enough to measure it. Do we know what temperature it is supposed to be at?
The specsheet attached to this thread tells that the heater has a temperature dependent resistance and that this resistance should be used for temperature control. I assume a PWM based driver could measure the resistance for sensing at the same time as driving.There's no built in measure, so it could be difficult to keep the crystal the optimal temperature. I wonder if you could measure how the resistance of the heater pad changes to get an idea of the temperature?
Thanks Immo.You could probably use any spare low-powered laser diode driver you might have lying around Curtis - adjusted to 300-400mA.
From Diachi's thread, just give the heater 1.5V - so a cheap DC-DC converter board ilke the one Anthony P posted would work for the heater.
Mine seems stable enough with just constant voltage. Seller I got mine from suggested the heater is sort of "self regulating". Mode and power look stable to the eye. I'd need a faster meter to really see any noise, but for what most people here are going to be doing they won't need temperature feedback.I'll take 4 of them.
And no, they don't come with drivers. I think I'm going to go with something similar to the design in that thread up above. I would think the heater would need to supply less power after the heatsink is warm. There's no built in measure, so it could be difficult to keep the crystal the optimal temperature. I wonder if you could measure how the resistance of the heater pad changes to get an idea of the temperature? It's even easier to have a probe outside next to it. It probably won't be that big of an issue anyway.