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ArcticMyst Security by Avery
Temperature circuit Idea
- Thread starter Leodahsan
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Benm
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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
HIMNL9
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^ ..... ceramic capacitors as temperature sensors (especially when you DON'T need that they acts in this way ) .....
) .....
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yeah, I think that tooI'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
ceramic capacitors?
maybe isn't as reliable than silicon diodes?
cmon people, lets try it!
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HIMNL9
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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 ..... .
.
Limecat
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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
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
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... any ideas?
Limecat
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Ideas for? You already have a circuit no? =]
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not very portable running at 12vcc, using a relay and being some years (~10) old.
Limecat
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well well.. Not actually what I'm looking for (not a switching IC, this is a DISPLAY IC ) but may be useful to another projects too Thanks
) but may be useful to another projects too Thanks
Limecat
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well well.. Not actually what I'm looking for (not a switching IC, this is a DISPLAY IC
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
Limecat
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Oh you mean a circuit that trips when a threshold temperature is reached. got it.
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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
Maybe using the SCR maintain current in this circuit would be good...
Maybe using the SCR maintain current in this circuit would be good...
Benm
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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 .....
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
