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Need help on a soldering station

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Hello. I need the help of experienced hams / engineers, I know, there are a lot of them on the site. Gathering a soldering station on arduino. Faced a problem - taking readings from a thermistor built into the heating element. According to the scheme, the thermistor (further the sensor) is connected according to this scheme:

The only thing, instead of the AD822 I took OP07, this op-amp is in the original HAKKO stations in this circuit, so this should not be the problem. The feedback resistance was reduced to 220 kOhm, otherwise the circuit did not respond to the adjustment in any way, I put a multi-turn, and then, somehow, it reacts within 2 revolutions. Moreover, if instead of the entire circuit, simply put a divider in the form of a potentiometer and connect to A0, then the value on the display changes when it is rotated. In general, the problem is that when the sensor itself is connected and heated from the outside (with a match), nothing happens. But the controller responds to the connection itself. All wires rang, the sensor too - 64 Ohm resistance. What's the trouble, help out ...
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15 comments
Author +2
Reply To quote A complaint
Korolev,
Yes, I mean in the evening)
Here's how to collect it! I’m sleeping everything to hell with a dog! Then I'll go buy ... xaxa
0
Reply To quote A complaint
feonor12,
Maybe I'm bored, nothing to do!
Take care of the business, earn money, it’s not difficult for you, and buy a normal soldering station with a hairdryer! yes
Author +1
Reply To quote A complaint
Korolev,
I totally agree!


Well, you are strange guys, why are you dissuading me then?) Maybe I’m bored, there’s nothing to do!
0
Reply To quote A complaint
Leobrynn,
Well, what prevents the Chinese from taking the paylo?
I totally agree! I apologize for the grammar of the original:
Eruntop 8586D + dual digital display electric soldering iron + hair dryer better SMD soldering station updated 8586, 1 563,83 руб.
yes
Author 0
Reply To quote A complaint
Dmitrij,
Yes, I have a regular soldering iron through a dimmer. But one sting on him, and changing them is inconvenient. And lately I prefer smd more and more, so I decided what to do.
0
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feonor12,
I solder a hundredth through a dimmer, I found the optimal value for myself when it does not burn the sting and solders normally. But the small one will certainly cool down quickly and must be "succumbed"
Author 0
Reply To quote A complaint
Leobrynn,
This soldering iron has been with me for two years already ... Anyway, my hands won’t reach ...
Dimer will not maintain temperature. In a soldering iron, when the temperature sags during the soldering of a large area, for example, the soldering iron immediately adds power. Well, the proportional-integral-differentiating regulator, all that.
Yes, I figured it out already. I’ll find the op-amp and collect it, there the schematic is not complicated.
Anyway, what kind of heresy are you talking about in the holy of holies? xaxa Shame on you, shame on you!)
0
Reply To quote A complaint
Well, what prevents the Chinese from taking the paylo?
- Soldering Station
- Soldering iron
Yes, why bother? Saw the dimmer to a regular tile and that’s it.
Author +1
Reply To quote A complaint
Pronin,
Rail to rail exactly at the entrance. And with power <5V (unipolar)

Damn, for sure ... I forgot that he is bipolar ...
I read more, it does not fit shorter hike. Like 358, at least they write like this:
And no, you cannot use lm358 op amp because it is very noisy. Your soldering iron would work like random generator.

Somewhere part of the comment was lost ... Instead of ad822, you can put mcp602 in general. It is easier to find and cheaper.
+3
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Quote: ino53

Conventional opamps do not have this property. For example, for most op-amps, when powered by +/- 15V, the output voltage can be somewhere up to +/- 12V, the rest is lost on the output stage [/ i] e ...

And at the entrance there is a dead zone at the edges, near power or zero.

For this scheme, specifically, an op amp with Rail to rail is needed precisely at the input. And with power <5V (unipolar). It is possible and cheaper type LM358, but then you need to reduce the R-feed of the temperature sensor. And adjust the tuning (R) to fit within the specified interval T (temperature)
+1
Reply To quote A complaint
Pronin,
Yes, and in a little more detail:
... e ...

And at the entrance there is a dead zone at the edges, near power or zero.
+2
Reply To quote A complaint
According to the above scheme, OP-07 will not work, since it is with 2 polar power supply.
Here you need an op amp with Rail to rail. This is just the AD822. Or put an analogue (cheaper).
+2
Reply To quote A complaint
You are using an instrumental operational amplifier (op amp), and it needs bipolar power. You have unipolar power in the circuit; LM358 can work with such power.
Good luck
Author 0
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tot.gnom,
Yes, I bought a soldering iron from the Chinese, but I immediately bought a new heating element, to replace what the Chinese put. True, too, the Chinese xaxa
But it seems that it was ceramics with a thermistor, as he wrote the resistance of 60+ Ohms, the thermocouple has a resistance of 1-2 ohms.

0
Reply To quote A complaint
Hello!
I also want to assemble a station, so I’m a little in the know.
If you bought a soldering iron from the Chinese, then perhaps a thermocouple is in the soldering iron.
The two I bought turned out to be both with a thermocouple.
Good luck

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