For JBC fans out there, JBC tips anatomy

[nukie]

Beware the post is in Chinese but pictures are self explain. Use Google Chrome for auto translation.

http://bbs.38hot.net/read.php?tid=28591

http://bbs.38hot.net/read.php?tid=28468

And if you click on the link below, plenty of 'demolition/dismantling' topics or what we call it teardown... seems the Chinese loves teardown as much as we do... but the reason behind it still a mystery   

http://bbs.38hot.net/thread.php?fid=50

All hail to the digital camera era!!

[BravoV]

... but the reason behind it still are mystery   

Nothing new actually, this brings out the nostalgic moment where my Dad brought home an ultra classified document made by one of the biggest Japanese car manufacturer in early 60s where they took tons of cutaway pics of a well known German's car engine block. 

[poodyp]

That's a pretty incredible teardown. Above and beyond the regular "I took off some panels but I'm afraid of breaking something" teardown, especially considering the tips can be on the order of $20-40 .

So it looks like the tip is an induction coil with the copper on the outside, with a thermocouple as well. Seems like the benefit of Metcal-like induction heating without the drawback of fixed temperature.

[saturation]

Nice.  Why tear downs are so extensive is simple, so they can learn or copy the technology. 

But tear downs can only go so far, I have yet to see a good Chinese copy of the HP 3458a now 25 years old or a DSO over 1 GHz.

[robrenz]

So it looks like the tip is an induction coil with the copper on the outside, with a thermocouple as well. Seems like the benefit of Metcal-like induction heating without the drawback of fixed temperature.

AFIK its resistive heating with thermocouple not induction.

[vzoole]

Ohh... If you post this earlier. Last week I cut apart a working JBC tip.
But thanks, they did it nicer.

[mikeselectricstuff]

So it looks like the tip is an induction coil with the copper on the outside, with a thermocouple as well. Seems like the benefit of Metcal-like induction heating without the drawback of fixed temperature.

AFIK its resistive heating with thermocouple not induction.

ISTR reading somewhere it uses the element for temp sensing - not sure whether resistive or as a thermocouple. Latter may be easier due to the high temp and low resistance.

[robrenz]

From JBC FAQ

How does the JBC heat up so quickly compared to older technology irons?
 
JBC soldering irons are fourth generation soldering technology.
 We use one wire buried deep in the tip of the copper to "read and feed." Our thermocouple and heating element wire are one in the same and are microprocessor driven over a sensor at 60 hertz utilizing up to 140 watts on demand in a very low mass cartridge. This is why our thermal performance cannot be matched. It is technolgy compatible with todays needs, as well as tomorrows. Our competitors are using technolgy invented 20+ years ago with little advancement.

[vzoole]

There is a schematic of JBC cartridge:

Temperature sense and heating is working on same two pin (C2; C3) just not the same time. Like in old (and in new too) Hakko stations (eg: Hakko 941).

The third pin (C1) is only for ground linked with C2.

ps.: (just prevent the misunderstandings...)
The JBC cartridge has resistance heating element and thermocouple sensor.

[vzoole]

One interesting wedding, JBC and Hakko.

[T4P]

Hack a FX-951 clone ... but JBCs have 130W instantaneous heat up and 90W nominal power rating
Wow, that's a heck lot of thermal horsepower

[robrenz]

And quite amazing to solder with 

[T4P]

And quite amazing to solder with 

I can attest to that. The best irons on earth, although i don't have one i trial'd one 

[nctnico]

Very nice teardown. I'm amazed how badly cluttered Chinese websites are although I like the Panda 'smillies'. I have used JBC a lot but I can't say I'm really impressed. The tips burn up quite quick and their 'excellent' heating system doesn't make it solder any better than an Ersa iron based on 20 year old technology.

[robrenz]

It is most noticeable on heavy thermal demand situations. I often solder large industrial connectors with heavy solder cups. On these the JBC is amazing, solder time per joint is literaly 1/5 the time of my weller WTCP. If you are just soldering ordinary board work it's high performance is barely used or noticed.

[thmjpr]

Excellent pictures, here are some metcal threads for comparison:
tip -
 http://bbs.38hot.net/read.php?tid=28630
 http://bbs.38hot.net/read.php?tid=15638
handle -
 http://imgur.com/a/RvDVu#0
 http://bbs.38hot.net/read.php?tid=28017
 http://bbs.38hot.net/read.php?tid=14751


also
Circuit breaker - http://bbs.38hot.net/read.php?tid=29091

[T4P]

Y U SPOIL JBC THREAD

[mofo]

Hi guys, its been a while since someone posted arround here, i started my own clone of jbc, and i was wondering if any of you studied the control altgorithm of the tips,
i have done a little reverse engineering on a DDST-2B station and on every channel there are 4 mosfets, curious how the tip is in configuration with the 4 mosfets?

I tryed a little experiment, you can see the video here, but the tip is controled via a PIC18F and a Triac

[suckiden]

Hi,

I'm also looking for a JBC Control Unit so I can use my handpiece.
Looks quite good, can you post a schematic so we can see how you've done that?