Modifying T12-952 soldering station for driving 2 tips

[JCOS1]

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.

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.

very good

[JCOS1]

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.

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.

[JCOS1]

Same as this.

[f1ght3r]

So the easiest way is to put a controler between the t12 station and the 2 tips which would read the temperature for each one and "direct" the power acordingly, however what temp would it report back to the station? I think it might be easier to do a separate "station" to deal with the tweezers.  I'm kinda curious now to find out how Hakko or JBC does it, cause as far as i know the tweezer works on "normal" station, so either they have made all stations with 2 temp circuts controllers inside or they add some kind of controller on the tweezer side, which might sound easier but i'm not sure how well that works in keeping things calibrated and such.

[JCOS1]

Where can I find this terminal to buy?.
It is plug into Chinese JBC 245 PCB Handskit
Dimensions: 3mm x 3.7mm x 6mm

[f1ght3r]

Quote from: JCOS1 on Today at 01:14:40 am

Where can I find this terminal to buy?.
It is plug into Chinese JBC 245 PCB Handskit
Dimensions: 3mm x 3.7mm x 6mm

Look for DIY handle kits on aliexpress or similar sites.
i found one but comes with all the handle parts https://aliexpress.com/item/1005004019617707.html?item_id=1005004019617707&sku_id=12000027759951136&spm=a2g2w.productlist.0.0.4eeb46d4A3zYh9
If not you could try to see which bullet female connector fits though it might need some modification to make sure it doesn't damage the tips when you change them.

[JCOS1]

Chinese novelty.
https://pt.aliexpress.com/item/1005004913385606.html?spm=a2g0o.detail.1000014.5.472f7d45khzluP&gps-id=pcDetailBottomMoreOtherSeller&scm=1007.40000.267768.0&scm_id=1007.40000.267768.0&scm-url=1007.40000.267768.0&pvid=0991dd2f-7749-4254-94cf-3a1a806c83d1&_t=gps-id:pcDetailBottomMoreOtherSeller,scm-url:1007.40000.267768.0,pvid:0991dd2f-7749-4254-94cf-3a1a806c83d1,tpp_buckets:668%232846%238116%23958&pdp_ext_f=%7B%22sku_id%22%3A%2212000030998514866%22%2C%22sceneId%22%3A%2230050%22%7D&pdp_npi=2%40dis%21BRL%21572.89%21320.84%21%21%21%21%21%40210323a716694756962452527e1aa9%2112000030998514866%21rec&ad_pvid=202211260714562671767951803627158777_0

[jorgemef]

Hello,

Anyone knows what is the pinout of these tweezers?
https://pt.aliexpress.com/item/1005007219058791.html

I added them in my KSGER STM32-2.1S and immediatly fried the AO4409 Mosfet. I replaced it with the one I had in stock, AO4407.

I am trying to understand if was lack of power or if the pinout of these tweezers is somehow different, and will not work with my station.

Maybe I need to make it in series or something.

By the way these stations are very dangerous as after the MOSFET shorted and I added a new tip (not yet aware of the short), it became red hot.
Also the 24V cable came assembled in reverse. Ground red and +VCC black. Fortunately electrons are colour blind.

BR,
Jorge

[jorgemef]

This is how it came connected, so I need to swap pin 5 with pin 2 as sensor switch shorted the mosfet.

[jorgemef]

As the Ksger is set for T12 Pin2 is connected to Pin5 so I need to cut the trace and will no longer work as T12 or keep it and modify the handle to conect the sensor to Pin1. So another mosfet blown.

[jorgemef]

I ended up by reconfiguring the pinout on the GX12 as normal T12. The tweezers go in parallel, pin4 DC ground/T12- plus switch SW 200D, pin1 switch SW 200D , pin 3 earth, pin5 T12+.

The mosfet I added (ao4407) handles the current for the 4 ohms of parallel fine, but would prefer to had used AO4409 which is capable of more current, but I dont have it handy at the moment.

Appart from that is working fine now.

Cheers,
Jorge