Bakon BK950D

[stj]

Re: Bakon BK950D

the tips are 70-75w at 24v,
i dont know why the controller is 19v but i suspect it uses a laptop transformer.

the russian guys have modded it for 24v btw.
i wont post the sketchy details now,
but heres the schem of the original unit.

[miksi]

Re: Bakon BK950D

So does your Bakon 950D run with 75W out of the box? I wonder if I got a fake one, if all 950D units are only 45W and always were, or if Bakon secretly changed the product some time ago?

The seller offered me 3 USD discount, I am still not clear what to think of all this. Damn …

[stj]

Re: Bakon BK950D

none run at 75w out-of-the-box.

[Fast Alpha]

Re: Bakon BK950D

Part of this iron near where the tip goes in it came off.
It separated from the holder.

Anything like this happen to you too.

Looks like loosy made.

[diif]

Re: Bakon BK950D

Yeah, the rubber grommet is loose on mine too.It doesn't affect usage at all.

[Fast Alpha]

Re: Bakon BK950D

It is really good at melting silver solder.

[stj]

Re: Bakon BK950D

the rubber bit is called the "strain-relief" - push it back in.

[sam_sam_sam]

Re: Bakon BK950D

the tips are 70-75w at 24v,
i dont know why the controller is 19v but i suspect it uses a laptop transformer.

the russian guys have modded it for 24v btw.
i wont post the sketchy details now,
but heres the schem of the original unit.

I going to ask really stupid question here but where is the temperature sensor part of this circuit

I see how the iron get it power from but how does it control the temperature where is the sensor part

[sam_sam_sam]

Re: Bakon BK950D

I have thought of buying one of these iron's to run off a 20 volt battery but I want to make sure that it has temperature control

[stj]

Re: Bakon BK950D

first you need to understand the iron cartridge,
the element and sensor are in series.

so the base senses the voltage returning from the iron in between the pulses from the fet powering the element.

if you want to use a battery, you just need to use the control board and get a small 5v regulator to power the microcontroller from your input voltage.

now to your question.
if you look at the upper right of the second diagram, you will see the iron signal just before the fet branches down to an LM358 op-amp.
this then feeds the analog input on the microcontroller.

[stj]

Re: Bakon BK950D

btw, maybe this would be simpler for you:
https://www.youtube.com/watch?v=HgrB5P-rDLw

[sam_sam_sam]

Re: Bakon BK950D

first you need to understand the iron cartridge,
the element and sensor are in series.

so the base senses the voltage returning from the iron in between the pulses from the fet powering the element.

if you want to use a battery, you just need to use the control board and get a small 5v regulator to power the microcontroller from your input voltage.

now to your question.
if you look at the upper right of the second diagram, you will see the iron signal just before the fet branches down to an LM358 op-amp.
this then feeds the analog input on the microcontroller.

Thanks for the explanation of how this works

What type of sensor is it ?

Do you know how fast the pluses are

is this like PWM or is a set pluse that does not change in value

[stj]

Re: Bakon BK950D

sensor is a cold junction themister - it generates voltage.

i think it's pwm.

[sam_sam_sam]

Re: Bakon BK950D

sensor is a cold junction themister - it generates voltage.

i think it's pwm.

Thanks for the info

[Fast Alpha]

Re: Bakon BK950D

In maplins there are two solders for sale, one normal lead free solder and lead free silver solder. I want to use normal one, my tip of soldering iron used the silver solder.

Will the silver solder always remain there?

[stj]

Re: Bakon BK950D

no, it will come off clean with a wire-wool cleaner or a damp cloth

[vinceroger69]

Re: Bakon BK950D

https://www.aliexpress.com/item/Newe...692790292.html

I just cut off the plug and fitted a UK one.

I know this is a old thread but ive finally just got around too ordering one of these irons and some various t12 tips.

[stj]

Re: Bakon BK950D

i hope you ordered one with a T12 handle then - most now have a T13 handle that uses shorter cartridges!

[vinceroger69]

Re: Bakon BK950D

i hope you ordered one with a T12 handle then - most now have a T13 handle that uses shorter cartridges!

Good spot stj ive just cancelled the order have you got a link too one that uses t12 tips and has the rubber handle thanks this is the one ive just cancelled does this ebay link look the correct one?
https://www.aliexpress.com/item/BK-9...54994c4dMqgVlF

https://www.ebay.co.uk/itm/BK950D-Di...kAAOSwRgJXmIlH

[stj]

Re: Bakon BK950D

the aliexpress seller clearly states T13,
the ebay seller - with a total of 5 doesnt know what the hell he has - saying hakko936!!!