Massive thanks to all my Patreon supporters without whom Postbag would be a feeble affair.
https://www.patreon.com/julian256
Adam Welch's YouTube Channel:
https://www.youtube.com/channel/UCm5sG3-BXQZfVy3st2T_XKg
eBay Links:
2 Pcs Car Capacitor 2.5V Protection Board Balancing Limit 3.5cm Universal New #Unbranded http://www.ebay.com/itm/2-Pcs-Car-Capacitor-2-5V-Protection-Board-Balancing-Limit-3-5cm-Universal-New-/272408094871
2.25" inch 8Ohm 8Ω 15W Full-Range Audio Speaker Loudspeaker Woofer Horn for SONY http://www.ebay.com/itm/2-25-inch-8Ohm-8-CE-A9-15W-Full-Range-Audio-Speaker-Loudspeaker-Woofer-Horn-for-SONY-/322448004809
http://www.ti.com/lit/ds/symlink/lm431.pdf
I created this video with the YouTube Video Editor (http://www.youtube.com/editor) - RIP 20th September

By Julian

Youtuber, shed dweller, solar charge controller aficionado

13 thoughts on “Julian’s postbag plus: #105 – bluetooth supercapacitor speaker”
  1. Avataaar/Circle Created with python_avatars Deepa V says:

    Sir,

    Its a nice video. I brought the balancing board. I tried testing the balancing board for verifying its regulation by connecting the supercapacitor and a variable power supply to the same slot and used a multimeter to measure the voltage of the supercapacitor. Not sure if the method is right because the multimeter would not be able to show the actual voltage of super cap as the source is also connected to same point. By this method, I find the voltage rising above 2.8V. Didnt check after that. Is there any way to ascertain that regulation is happening? What is the max applicable voltage to the board for the regulation to happen?

  2. Avataaar/Circle Created with python_avatars NoSaltiesAnd RoosHere says:

    Hello Julian! 👍

    That's very nice of Adam Welch, that he has given you a soldering station!
    Not only did I subscribe to you, but also Adam Welch's channel – very interesting!

    Best regards from Austria!
    PS .: Yes, I know that this video is from August 2017, but I'm watching all 88 videos from your playlist!

  3. Avataaar/Circle Created with python_avatars Roy Tellason says:

    I don't understand why you are so timid when it comes to the current setting you're using to charge those capacitors…

    Here's a thought: How about instead of an LED, connect the input side of an optoisolator across those resistors. Then you can do all sorts of things with the output sides, and it won't depend so much on the exact details of the circuit you're trying to monitor.

  4. Avataaar/Circle Created with python_avatars John Stephenson says:

    My solder station the same unit burnt out after 3 weeks!
    I ended up getting a Precision A55KJ!

  5. Avataaar/Circle Created with python_avatars Wayne Evans says:

    RIGHT!

  6. Avataaar/Circle Created with python_avatars Gadgetboy says:

    I like that little power supply you're using, where's it come from?

  7. Avataaar/Circle Created with python_avatars LhDiy says:

    Hi, i like your video's Julian. Do you have a link for the small power regulated supply you used to charge those supercaps ? Thanks.
    Sorry, found it …;-)

  8. Avataaar/Circle Created with python_avatars dave henderson says:

    i love my katsu and i run it at 350 temp

  9. Avataaar/Circle Created with python_avatars Roy van Lierop says:

    You should make a capacitor based spot-welder for 18650 batteries.

  10. Avataaar/Circle Created with python_avatars Matthew Bettcher says:

    Flux!!! It will make soldering so much easier.

  11. Avataaar/Circle Created with python_avatars Hans Zimniak says:

    You have a full chain of crappy elements with unexpected behaviour. No way you can seriously measure something and learn from it. I suggest to start with a decent power supply and a reliable reading of voltage and current. Never trust build in 7 segment 10 penny meters on Ebay DIY power circuit boards. 🤓

  12. Avataaar/Circle Created with python_avatars Bud Sims says:

    Can't wait to see this all done.

  13. Avataaar/Circle Created with python_avatars James Price says:

    Julian how does the protection circuit work if you are charging directly on the + and – terminals

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