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Modifying T12-952 soldering station for driving 2 tips
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JCOS1:

--- Quote from: cosmin1 on March 11, 2022, 07:54:44 am ---
--- Quote from: JCOS1 on March 11, 2022, 12:28:33 am ---Also transforms into soldering iron in two ways
Was it good?.
It took a lot of work.
cosmin 1, how did you do it?. I'm looking for an easier way to do it, yours seems to allow the use of almost all types of tips.

--- End quote ---
I molded the entire tweezer housing from high temperature ABS, inserted the contacts and copper rings to hold tips in propper position. It wasn't an easy job. It took me several weeks of work but it's somthing you can't buy.

I have those tweezers you used, too. But i connect them to a classic soldering station in case something happens to this.
In same way i built a 5V tweezers, adjustable power, works great on small jobs. It's not finished, but it's in fully working condition.

--- End quote ---

very good
JCOS1:

--- Quote from: asis on September 24, 2020, 08:57:16 am ---Hi,
Your idea makes sense.
If the source power is sufficient to power two heaters simultaneously, then it will work.
This is the design used in the TT65 PACE Tweezers.

--- End quote ---
I already did this kind of test on t12, it works perfectly.
  It is necessary to increase the current capacity by adding wires in parallel at the right points.
No need for calibration, the temperature remains the same with the 2 tips or if you remove 1 , the same and stable.
The most annoying thing is that you have to buy several tips, select the pairs that have the same temperatures, or very close.
I did it differently because I wanted more portability.
DavidAlfa:
When running them in parallel, the hotter and colder thermocouples will fight, partially cancelling each other,  reporting a -kind of- average voltage.
Can work, but also might cause problems if there's a big temperature difference.
The cold tip will subtract voltage from the hotter one, so the reading will be lower, the controller will put more power and the hotter tip might reach dangerous temperatures.
JCOS1:
That's why you have to select the pairs of tips so that they are as close as possible in temperatures.
Mine are 5 degrees different.
DavidAlfa:
No, that's not what I mean. You might use perfectly matched tips.
When one of them touches something and cools down, pulls the voltage from the hotter one, but the power will heat both tips concurrently.
This is an example. See how 250ºC and 450ºC tips in paraller report 350ºC.

When you heat a part that has one pin connected to heavy gnd plane, that tip will lose a lot of heat.
In that instant, the other tip, which is not so thermally loaded, will rise its temperature.
You'll end with a very hot tip in the unloaded side and a mildly hot tip where you really need the heat.
Good luck not burning the pads!

This is a very crappy way to do it. You really should make 2 sensing/power stages.
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