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FrozenGate by Avery

Temperature circuit Idea






Limecat said:
I'm scientific minded and OCD about doing things PERFECT even if its just a one time thing
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I'm a scientist by eduction as well, but found that with electronics a bit of empirical research (i.e. mucking around) sometimes gives interesting solutions.

Sometimes using undesireable properties of components turns out very nice. Diodes as temperature sensors, voltage-dependent capacitors, voltage references, its all possible :D
 
^ ..... ceramic capacitors as temperature sensors (especially when you DON'T need that they acts in this way :whistle:) ..... :p :D
 
Benm said:
I'm a scientist by eduction as well, but found that with electronics a bit of empirical research (i.e. mucking around) sometimes gives interesting solutions.

Sometimes using undesireable properties of components turns out very nice. Diodes as temperature sensors, voltage-dependent capacitors, voltage references, its all possible :D
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yeah, I think that too :D

ceramic capacitors?
maybe isn't as reliable than silicon diodes?
cmon people, lets try it!
 
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^ no, they are very incostant ..... that was a joke, it's related to when you use a ceramic (multilayer) capacitor in an oscillator, and then you discover that your output frequency change (a lot) when temperature changes, apparently without reasons ..... :p :D .
 
Benm said:
I'm a scientist by eduction as well, but found that with electronics a bit of empirical research (i.e. mucking around) sometimes gives interesting solutions.

Sometimes using undesireable properties of components turns out very nice. Diodes as temperature sensors, voltage-dependent capacitors, voltage references, its all possible :D
Click to expand...

That's what I mean - at least 2 extra decimals of precision are required before I actually use it. one one sig fig = WTF THIS ISN'T GOOD ENOUGH lolol
 
not very portable running at 12vcc, using a relay and being some years (~10) old.
 
well well.. Not actually what I'm looking for (not a switching IC, this is a DISPLAY IC :P) but may be useful to another projects too :) Thanks
 
Limecat said:
You've lost me.
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I think a switching transistor with a SCR could be enough, but I'm out of time/parts/knowledge to test it.

People, here is some thinking, correct me if I'm wrong:
I know that a SCR triggers at a determined current.
Maybe, putting a LM317 output at the SCR Gate (to maintain the current) with a transistor at the LM ADJ+Vo for sensing of the diode.

The diode got sensed by the transistor, that regulates the current at the LM317, that triggers the SCR at a determinated temperature.

the concept is right, but it is reversed. As I said, I'm no master and I need help :)
 
Oh you mean a circuit that trips when a threshold temperature is reached. got it.
 
I mean, the reverse, when the threshold temperature is reached, the circuit (the driver) got turned off to protect the LD from the temperature hazard :p

Maybe using the SCR maintain current in this circuit would be good...
 
HIMNL9 said:
^ no, they are very incostant ..... that was a joke, it's related to when you use a ceramic (multilayer) capacitor in an oscillator, and then you discover that your output frequency change (a lot) when temperature changes, apparently without reasons ..... :p :D .
Click to expand...

Hehe.. that is a sure thing indeed.

I used to do work on RF oscillators, especially ones in the FM broadcast band. If you dont take any precaution on thermal drift with a free running (non-pll) oscillator, chances are you can tell temperature by simply looking at the frequency you receive the signal on :D
 
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