4 ms·

You can now buy ready-made USB-C to <barrel-jack of your choosing here> on Taobao for like a few dollars. It's designed and sold as a complete product and just

by ylyn 6y ago

You can now buy ready-made USB-C to <barrel-jack of your choosing here> on Taobao for like a few dollars. It's designed and sold as a complete product and just looks like any other dongle/adaptor cable.

MrBuddyCasino 6y ago
Can confirm they work very well, used one to extend the battery life of a PartyBox 100 (see https://www.reddit.com/r/JBL/comments/ivdkrg/jbl_partybox_100_mod_to_extend_battery_life_with/ https://www.reddit.com/r/JBL/comments/ivdkrg/jbl_partybox_10...). The new USB Power Delivery 3.0 PPS (Programmable Power Supply) standard even supports requesting arbitrary voltages, but I haven't yet found an adapter that is programmable and supports this.
- nicoburns 6y ago
  Interesting, those PartyBox 100's have very good reviews and I've been considering getting one. How much play time do you get with that power bank?
  - MrBuddyCasino 6y ago
    With the power bank plus the internal battery, it plays for at least 10 hours on full volume, probably 12. Also the sound is better with the external power bank, as the DSP limits volume and bass response when running on internal power. The PB100 is good value for the money, but don’t expect hifi quality. Its currently the best off-the-shelf solution for something you can still stuff in a backpack, unless you spend the big bucks and go with a Soundboks. They really half-assed it tho: - the LED lights are erratic and don't look that great - the BT range is crap - no built-in connector to connect external DC power like in the PB300 - internal battery life is not great, just 2400mAh, also not swappable - no second set of tweeters like in the PB300 - takes a long time to boot (~20secs) - no app to adjust the DSP or disable the startup sound
- baybal2 6y ago
  This one does: https://m.aliexpress.com/item/4001219988981.html https://m.aliexpress.com/item/4001219988981.html
  - MrBuddyCasino 6y ago
    I didn't mean an AC charger, but a PD trigger that I can program to request any voltage I want. Currently only fixed voltages (5V/12V/20V) are available.
    - mgamache 6y ago
      I think that's because PD spec is only those voltages (5,9,15 and 20 volts). You'll have to use a regulator or buck converter to get other voltages.
      - baybal2 6y ago
        PPS extension allows for arbitrary voltages
jacob019 6y ago
I just imported a bunch of them to launch on ebay/amazon/etc. Should be similarly inexpensive.
- baybal2 6y ago
  A showstopper here: some of them use PPS, and some use fixed 20V code. Very, very few USB PD power supplies support PPS 20V at full 5A.
  - MrBuddyCasino 6y ago
    And even fewer power banks. Until recently not a single one existed that could put out 100W over the whole battery charge, they all switched to 50-60W for the last 50%, which also means they couldn't fully charge laptops like the larger Macbook Pros. But now there is the Zendure SuperTank Pro: https://www.kickstarter.com/projects/zendure/supertank-pro-the-surprisingly-compact-mobile-power-station/posts https://www.kickstarter.com/projects/zendure/supertank-pro-t...
    - baybal2 6y ago
      And a lot of 65W rated tagged cables tend to melt under full load, and one of which was bundled by one quite major hardware brand whose name starts with "A." This is why a lot of charger makers went for "workarounds" for 5A cables rather than risk being blamed for setting mismarked cables on fire. Their cable marked "65W" did not actually work on 5A 15V, but on 3A 20V where it is not the issue, but will melt when used by actual 5A 15V.
      - MrBuddyCasino 6y ago
        Oh that is good to know! I measured 20V/3,?A on my barrel jack adaptor, now wondering if it can actually do 5A as advertised. Is there a way to query the cable for what it will actually report as supported voltages / current?
        6y ago

by ylyn 6y ago

MrBuddyCasino 6y ago

Can confirm they work very well, used one to extend the battery life of a PartyBox 100 (see https://www.reddit.com/r/JBL/comments/ivdkrg/jbl_partybox_100_mod_to_extend_battery_life_with/ https://www.reddit.com/r/JBL/comments/ivdkrg/jbl_partybox_10...). The new USB Power Delivery 3.0 PPS (Programmable Power Supply) standard even supports requesting arbitrary voltages, but I haven't yet found an adapter that is programmable and supports this.

nicoburns 6y ago
Interesting, those PartyBox 100's have very good reviews and I've been considering getting one. How much play time do you get with that power bank?
- MrBuddyCasino 6y ago
  With the power bank plus the internal battery, it plays for at least 10 hours on full volume, probably 12. Also the sound is better with the external power bank, as the DSP limits volume and bass response when running on internal power. The PB100 is good value for the money, but don’t expect hifi quality. Its currently the best off-the-shelf solution for something you can still stuff in a backpack, unless you spend the big bucks and go with a Soundboks. They really half-assed it tho: - the LED lights are erratic and don't look that great - the BT range is crap - no built-in connector to connect external DC power like in the PB300 - internal battery life is not great, just 2400mAh, also not swappable - no second set of tweeters like in the PB300 - takes a long time to boot (~20secs) - no app to adjust the DSP or disable the startup sound
baybal2 6y ago
This one does: https://m.aliexpress.com/item/4001219988981.html https://m.aliexpress.com/item/4001219988981.html
- MrBuddyCasino 6y ago
  I didn't mean an AC charger, but a PD trigger that I can program to request any voltage I want. Currently only fixed voltages (5V/12V/20V) are available.
  - mgamache 6y ago
    I think that's because PD spec is only those voltages (5,9,15 and 20 volts). You'll have to use a regulator or buck converter to get other voltages.
    - baybal2 6y ago
      PPS extension allows for arbitrary voltages

jacob019 6y ago

I just imported a bunch of them to launch on ebay/amazon/etc. Should be similarly inexpensive.

baybal2 6y ago
A showstopper here: some of them use PPS, and some use fixed 20V code. Very, very few USB PD power supplies support PPS 20V at full 5A.
- MrBuddyCasino 6y ago
  And even fewer power banks. Until recently not a single one existed that could put out 100W over the whole battery charge, they all switched to 50-60W for the last 50%, which also means they couldn't fully charge laptops like the larger Macbook Pros. But now there is the Zendure SuperTank Pro: https://www.kickstarter.com/projects/zendure/supertank-pro-the-surprisingly-compact-mobile-power-station/posts https://www.kickstarter.com/projects/zendure/supertank-pro-t...
  - baybal2 6y ago
    And a lot of 65W rated tagged cables tend to melt under full load, and one of which was bundled by one quite major hardware brand whose name starts with "A." This is why a lot of charger makers went for "workarounds" for 5A cables rather than risk being blamed for setting mismarked cables on fire. Their cable marked "65W" did not actually work on 5A 15V, but on 3A 20V where it is not the issue, but will melt when used by actual 5A 15V.
    - MrBuddyCasino 6y ago
      Oh that is good to know! I measured 20V/3,?A on my barrel jack adaptor, now wondering if it can actually do 5A as advertised. Is there a way to query the cable for what it will actually report as supported voltages / current?
      - 6y ago