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Old 12-10-2010, 01:42 PM #17
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Default Re: Temperature circuit Idea

Quote:
Originally Posted by Benm View Post
Feel free to post any circuit ideas you have, i'd be happy to take a look at them!
actually, I think anyone should try it.
I'm not a especialist, I just give the ideas.


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Old 12-10-2010, 03:31 PM #18
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Default Re: Temperature circuit Idea

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Originally Posted by Limecat View Post
I'm scientific minded and OCD about doing things PERFECT even if its just a one time thing
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
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Old 12-10-2010, 04:03 PM #19
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Default Re: Temperature circuit Idea

^ ..... ceramic capacitors as temperature sensors (especially when you DON'T need that they acts in this way ) .....
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Old 12-10-2010, 04:06 PM #20
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Default Re: Temperature circuit Idea

Quote:
Originally Posted by Benm View Post
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
yeah, I think that too

ceramic capacitors?
maybe isn't as reliable than silicon diodes?
cmon people, lets try it!
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Old 12-10-2010, 04:30 PM #21
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Default Re: Temperature circuit Idea

^ 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 ..... .
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Old 12-12-2010, 07:56 AM #22
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Default Re: Temperature circuit Idea

Quote:
Originally Posted by Benm View Post
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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Old 12-12-2010, 08:24 PM #23
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Default Re: Temperature circuit Idea

... any ideas?
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Old 12-12-2010, 09:49 PM #24
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Default Re: Temperature circuit Idea

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... any ideas?
Ideas for? You already have a circuit no? =]
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Old 12-12-2010, 09:52 PM #25
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Default Re: Temperature circuit Idea

not very portable running at 12vcc, using a relay and being some years (~10) old.
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Old 12-12-2010, 09:58 PM #26
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Default Re: Temperature circuit Idea

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Originally Posted by Leodahsan View Post
not very portable running at 12vcc, using a relay and being some years (~10) old.
http://elektronicastynus.be/Projecte...ng/ICL7107.pdf
Figure 18
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Old 12-12-2010, 10:02 PM #27
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Default Re: Temperature circuit Idea

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
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Old 12-12-2010, 10:03 PM #28
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Default Re: Temperature circuit Idea

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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
You've lost me.
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Old 12-12-2010, 10:15 PM #29
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Default Re: Temperature circuit Idea

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You've lost me.
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
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Old 12-12-2010, 10:17 PM #30
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Default Re: Temperature circuit Idea

Oh you mean a circuit that trips when a threshold temperature is reached. got it.
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Old 12-12-2010, 10:19 PM #31
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Default Re: Temperature circuit Idea

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...
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Old 12-12-2010, 11:50 PM #32
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Default Re: Temperature circuit Idea

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Originally Posted by HIMNL9 View Post
^ 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
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