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Messages - diogoc

36
Project logs / Re: HAKKO (907ESD) and SOLOMON (SL-10/30) soldering iron dri
[quote author="arakis"]Sorry for butting in, but, how do you know it uses a TC as a temperature sensor? this is the bassis for your whole circuit, and if it is not the sensor they use, your circuit simply won't work...[/quote]

I'm not sure that it uses a TC, but I see some schematics, inclusive commercial drivers for the T12 tips and they are based on TC basis.

thinking about it really does not make much sense to use a thermistor as its resistance varies with temperature and so the entire heater resistance also varied

But as I said I have to test that when I get the T12 tip
39
Project logs / Re: HAKKO (907ESD) and SOLOMON (SL-10/30) soldering iron dri
[quote author="arhi"][quote author="diogoc"]I have modified the schematic for the Hakko T12 tip.

Do you think it can work?[/quote]

not like this it won't work

when you turn on Q1 you will have 24V on the heater+ so 24V on R9, zener will cut it to 5V but not really best solution, not to mention everything will go to hell if R9 dies.

does 8495 has cold joint compensation?[/quote]

yes 8495 have cold joint compensation.
I have some doubts about the zener. The R9 have 24V-5v= 19V so it will dissipate 26mW, it is no much for a 1/4W resistor.
The AD8495 could have 25V on its inputs so the zener is only for precaution, but I can reduce the 24V for the heather and remove the zener
44
Project logs / Re: HAKKO (907ESD) and SOLOMON (SL-10/30) soldering iron dri
I have talked about that tip because I see that:

http://www.aliexpress.com/item/Free-Shi ... 21251.html

$20 for the handle + tip and free shipping I think it is not too expensive.
Each tip is about $10 and have several advantages relative to Hakko 907, as the temperature is more constant and less delay because the sensor is located near the tip end, easy replacement tip in operation, and when replacing the tip the heater is also new

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