Author Topic: EEVblog #1113 - Is a $5 USB Soldering Iron Useful  (Read 1723 times)

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Online EEVblog

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EEVblog #1113 - Is a $5 USB Soldering Iron Useful
« on: August 08, 2018, 08:27:16 am »
Is a $5 8W USB soldering iron actually useful?

 

Online The Soulman

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Re: EEVblog #1113 - Is a $5 USB Soldering Iron Useful
« Reply #1 on: August 08, 2018, 08:37:31 am »
Without having watched the video, nope.
I'll watch now...  :popcorn:
 

Online SilverSolder

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Re: EEVblog #1113 - Is a $5 USB Soldering Iron Useful
« Reply #2 on: August 08, 2018, 08:59:06 am »
LOL!  Now all we need is PWM to drive that FET...  and a temperature sensor bodged on the outside of the iron, redneck style...  voila, the $7 soldering station!
 

Offline barbeque

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Re: EEVblog #1113 - Is a $5 USB Soldering Iron Useful
« Reply #3 on: August 08, 2018, 09:24:11 am »
LOL!  Now all we need is PWM to drive that FET...  and a temperature sensor bodged on the outside of the iron, redneck style...  voila, the $7 soldering station!
Get a USB hub and a $2 USB keyboard vacuum and we've got a $10 desoldering station!
 

Offline glarsson

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Re: EEVblog #1113 - Is a $5 USB Soldering Iron Useful
« Reply #4 on: August 08, 2018, 05:17:18 pm »
How do you power on this thing "out in the field" without 50/60Hz "in the air"?
 

Offline wooby6

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Re: EEVblog #1113 - Is a $5 USB Soldering Iron Useful
« Reply #5 on: August 08, 2018, 09:07:31 pm »
The official model is ZD-20U,
You can buy spare tips (just search ZD-20U).
There are multiple rehashed versions, but they all used the same tips.
There is also a version used as a hotknife for 3d print cleanup called modifi3d which comes with its own special tips.

Funny enough this is my goto soldering iron for any small projects, it's especially useful for manual soldering SMD
also with a simple modification you can make it always on
 

Offline woox2k

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Re: EEVblog #1113 - Is a $5 USB Soldering Iron Useful
« Reply #6 on: August 08, 2018, 10:42:39 pm »
I wonder if it's even possible to design a reasonable quality USB soldering iron in the first place. (5v limited to 2A without that quickcharge rubbish) Like with 2A you only get max 10w out of it. Since soldering irons are mostly not working at full load, would adding a supercap or something into it help things along when the tip needs quick boost of energy and recharge it with excess energy when the tip is up to temperature? Would it even be beneficial and has anyone tried it? Proper USB soldering irons would certainly have place in the world considering that 5V2A power banks are everywhere these days.
« Last Edit: August 08, 2018, 10:44:55 pm by woox2k »
 

Offline thm_w

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Re: EEVblog #1113 - Is a $5 USB Soldering Iron Useful
« Reply #7 on: August 09, 2018, 06:38:33 am »
I wonder if it's even possible to design a reasonable quality USB soldering iron in the first place. (5v limited to 2A without that quickcharge rubbish) Like with 2A you only get max 10w out of it. Since soldering irons are mostly not working at full load, would adding a supercap or something into it help things along when the tip needs quick boost of energy and recharge it with excess energy when the tip is up to temperature? Would it even be beneficial and has anyone tried it? Proper USB soldering irons would certainly have place in the world considering that 5V2A power banks are everywhere these days.

Supercap probably wouldn't hold enough energy for the cost, but li-ion would work quite well. An 18650 could give you 40W continuously for ~10mins.
 

Offline Fungus

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Re: EEVblog #1113 - Is a $5 USB Soldering Iron Useful
« Reply #8 on: August 10, 2018, 07:04:35 pm »
Without having watched the video, nope.
I'll watch now...  :popcorn:

You lose.  :-DD
 

Offline Fungus

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Re: EEVblog #1113 - Is a $5 USB Soldering Iron Useful
« Reply #9 on: August 10, 2018, 07:09:41 pm »
The touch sensor might work better if it was plugged into something bigger, like a laptop.

But then you probably wouldn't have enough amps to heat it up.  :-//

The touch sensor is the only big fail here, it should be a push button.
 

Offline Fungus

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Re: EEVblog #1113 - Is a $5 USB Soldering Iron Useful
« Reply #10 on: August 10, 2018, 07:28:27 pm »
How do you power on this thing "out in the field" without 50/60Hz "in the air"?

Capacitive sensing doesn't need anything in the air.

I wonder if it's even possible to design a reasonable quality USB soldering iron in the first place.

Is it even desirable, given the wide availability of 18650 batteries?

But yes:
a) You could use thick wire in the USB cables to get a full 5V (I'm disappointed Dave didn't measure the voltage inside the iron...)

b) You can connect to multiple USB ports to get a lot more current.

c) A decent capacitor inside could help a lot with the temperature drops, allow you to work at a lower temperature.

There's a lot of possible tweaks to the concept.
« Last Edit: August 10, 2018, 07:35:32 pm by Fungus »
 

Offline glarsson

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Re: EEVblog #1113 - Is a $5 USB Soldering Iron Useful
« Reply #11 on: August 10, 2018, 07:37:22 pm »
Capacitive sensing doesn't need anything in the air.
But it is not sensing capacitance. It's just connected directly to the 555.
 

Offline bullet308

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Re: EEVblog #1113 - Is a $5 USB Soldering Iron Useful
« Reply #12 on: August 11, 2018, 02:53:13 am »
Looks like it might be worth $3 for smaller SMD work...I Can certainly afford to find out I am wrong...
>>>BULLET>>>
 

Online tsman

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Re: EEVblog #1113 - Is a $5 USB Soldering Iron Useful
« Reply #13 on: August 11, 2018, 03:46:07 am »
Careful with how you power it though. The tip isn't isolated from the input so a battery pack is probably best.
 

Offline Fungus

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Re: EEVblog #1113 - Is a $5 USB Soldering Iron Useful
« Reply #14 on: August 11, 2018, 04:51:35 am »
Looks like it might be worth $3 for smaller SMD work...I Can certainly afford to find out I am wrong...

At 450 degrees?
 

Offline Brumby

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Re: EEVblog #1113 - Is a $5 USB Soldering Iron Useful
« Reply #15 on: August 12, 2018, 09:36:47 am »
... to 500º or more.

Yes.  Just hold the tip 2 - 3mm away from the solder paste to reflow.  No contact necessary.
 



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