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EEVblog #542 – ZD985 Desoldering Station

April 16, 2018 Jon 30 Comments

Review, teardown, and testing of the Rhino Tools ZD985 desoldering station on typical through-hole double sided and multi layer PCBs.

Forum: http://www.eevblog.com/forum/blog/eevblog-542-zd985-desoldering-station/

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Video Rating: / 5

Didn't Wash Hands Alarm

This project shows you how to make an alarm that will go off anytime someone forgets to wash their hands in the restroom. Small piezo sensors detect when water is moving through the pipes of the toilet and the sink. If someone uses the toilet but doesn’t use the sink, then the alarm will go off when they open the door to leave.

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  1. misperry
    April 16, 2018 - 9:33 pm

    Awesome Dave thanks for the review. I think I may give it a go. I need some light use of a desolder gun and this looks like a good cheap unit that will work.

  2. Edward Gilmour
    April 16, 2018 - 10:18 pm

    Any one notice all the dry joints on that UPS board he is working on?

  3. Darren Cowasaki
    April 16, 2018 - 11:15 pm


  4. Upcycle Electronics
    April 17, 2018 - 12:03 am

    I need this bad 😉

  5. Paul
    April 17, 2018 - 12:36 am

    No thanks. I think I will just stick with my little Oryx vacuum oump. Never failed me before 🙂

  6. Fried Mule
    April 17, 2018 - 12:55 am

    Is it still working? 🙂

  7. Metaldetector Experimenter
    April 17, 2018 - 1:09 am

    Looks like leaded solder on this board , lead free desoldering will prove a lot harder…

  8. booboyBL
    April 17, 2018 - 1:33 am

    I've just received a later version of this, a DURATOOL branded ZD-915
    This arrived today, and all seemed OK on initial switch on.
    Element heated up, and temp could be changed.
    However, when I pulled the trigger on the gun nothing happened (no pump noise). Checking continuity on the gun trigger to the connector showed that the switch was operating OK.
    SO, the cover had to come off. All looking good internally, but when I looked at the connections to the pump, one of the wires was not connected (fell off when wiggled).
    I have now repaired that, but I'm NOT impressed with the build quality.
    The unit itself now works very well, I AM impressed with the functionality overall. Just the build quality lets it down.

  9. Alain Bibi
    April 17, 2018 - 1:53 am

    Do not complain about the quality, a Chinese will be hit on the other side of the earth !
    H**lo to your home !

  10. LondonNight
    April 17, 2018 - 2:37 am

    "You just wanna do one joint" -Dave 2013

  11. Mike Lafferty
    April 17, 2018 - 2:37 am

    Glad I watched. After purchasing this unit, mine didn't work either! I found one of the wires going to the pump motor had never been soldered to the motor terminal. Nice. I guess they ever test these units before shipping! LOL. Well, after fixing it the device works fine. Thanks for your review.

  12. Mike Lafferty
    April 17, 2018 - 3:24 am

    can you tell me what camera you're using?

  13. khuram ch
    April 17, 2018 - 4:22 am

    How can we calibrate it's temp

  14. ekdromoi
    April 17, 2018 - 4:55 am

    ok, so.. how do I wire this to keep the door locked till they wash their hands

  15. Rukaya Ilah
    April 17, 2018 - 5:01 am

    need this for kids

  16. Hidden Planet Productions
    April 17, 2018 - 5:28 am

    reminds me of a far side comic strip.

  17. MalachiTheAdventurer
    April 17, 2018 - 6:09 am

    I <3 this so much. The shame on his face XD

  18. Lakes57
    April 17, 2018 - 6:16 am

    So, you wash your hands, then use a dirty germ ridden door handle… 😉

    April 17, 2018 - 6:41 am

    Could you do the same thing easier by just having a sensor in the door handle that detects skin conductivity? (wet hands = lower resistance)

  20. Megacier
    April 17, 2018 - 6:50 am

    I would like to use 5 seconds of your video ( 0:24 to 0:29)  for another video which will be published on YouTube (no advertising).

    Can I ?

  21. fluffy
    April 17, 2018 - 7:01 am

    Life imitates The Far Side.

  22. Noah M
    April 17, 2018 - 7:58 am

    people can just turn the sink on and off

  23. hash glass
    April 17, 2018 - 8:53 am

    Just don`t get poo on you

  24. BinkieMcF**tnuggets
    April 17, 2018 - 9:29 am

    Thank god they don't have a "Didn't Wipe Ass" alarm yet.

  25. Julie Lloyd
    April 17, 2018 - 9:40 am

    What if when you're done someone get's done pretty quick, while you're washing your hands, wouldn't it go off when you try to leave?

  26. Adam Bodford
    April 17, 2018 - 10:30 am

    1984 isn't supposed to be a walk-through!!! WTF?!

  27. Michael Griffin
    April 17, 2018 - 11:06 am

    I don't want to be racist but here, in Europe, we don't p**s or poo (no offence) in our hands!!! And we clean ourselfs every day so there is no bacteria on our private parts! Come on now!! I'm not british so don't make stupid jokes! Again no pun intended.

  28. Roman Kupka
    April 17, 2018 - 11:14 am


  29. Stan Marsh
    April 17, 2018 - 11:48 am

    this idea is absurd…
    fails when we are talking about bathrooms that have more than 1 person using it at a time, or if someone doesnt flush -.-

  30. Chris Gonzales
    April 17, 2018 - 12:36 pm

    Story an old friend used to tell:  A Navy guy notices an Army guy leaving a restroom without washing hands. Navy guy says "In the Navy they teach us to wash our hands after we p**s". Army guy says "In the Army they teach us not to p**s on our hands".  

    Actually, if that thing buzzed on me I would flush it down the freakin toilet.

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