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| 05:12.12 | whitequark | opbolt: current indication for phones? |
| 05:12.40 | whitequark | if you mean the thing that tells a smartphone to draw 1A or 2A instead of 500mA permitted by the spec, short D+ and D- |
| 05:12.43 | whitequark | that's it |
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| 14:03.22 | opbolt | whitequark, yes |
| 14:04.53 | opbolt | so that tell them its all they can eat? well then thats easier that i thought. i thought i needed special ic to handle off the differences like in fancy 5v usb power supplys. |
| 14:05.05 | opbolt | off=all |
| 14:05.12 | opbolt | thx |
| 14:25.23 | whitequark | opbolt: correction: by the spec, a device can draw 1.5A from a dedicated charging port |
| 14:25.28 | whitequark | the one with D+/D- shorted |
| 14:26.27 | opbolt | arr ok. so not 2a but 1.5v is enough |
| 14:26.56 | opbolt | 1.5a isolated dc-dc supplys will be cheaper than 2a ones anyway :) |
| 14:27.05 | opbolt | thanks muchly |
| 14:28.19 | whitequark | opbolt: take a look at https://pdfserv.maximintegrated.com/en/an/TUT5801.pdf too |
| 14:28.53 | whitequark | it's a bit more complicated than that in practice because vendors implement proprietary extensions |
| 14:28.58 | opbolt | arr thank much just what i needed |
| 14:29.18 | opbolt | typical of them |
| 14:31.33 | DocScrutinizer05 | there are like 4 different specs how chargers signal max-current to charging-peripheral. shorting D+/D- is the simplest one. Then there's "apple" method of attaching voltage dividers and thus voltage levels from VBUS to D+ and D-, then you also could add a certain resisitr from ID to GND, and finally there's ENUM (digital) |
| 14:32.01 | whitequark | yeah that pdf lists them :) |
| 14:32.50 | DocScrutinizer05 | maxim? yes, has some good datasheets and whitepapers covering this madness |
| 14:33.34 | whitequark | the chips tend to have obnoxious bugs though |
| 14:36.09 | opbolt | every grateful |
| 14:39.19 | opbolt | been blowing up china dc-dc +/- dc convters :( i see in exspensive ones on digkey there is a capacitive load column like 2000uf etc... hmm need to read up about this but i noted that on pwoer up the tone board needs more than a 1A as the 2000uf caps charge up then then goes down to under 100ma i think it was. wondering if the very high current demand on power up is what is frying these dc-dc converter boards |
| 14:40.44 | opbolt | my higher power china dc-dc converter board has suvived but it seams to be adding noise to the audio signal :( so im scanning though digkey or rapid for something better to power these tones boards |
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| 16:28.42 | opbolt | arrgh finding +/-15 dc-dc converters with 2000uf capacitive load is not easy! |
| 16:29.11 | opbolt | most dont go above 500uf... more seaching to do |
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| 18:35.39 | whitequark | you could just add an inductor |
| 18:35.44 | whitequark | to limit inrush current |
| 18:36.04 | whitequark | that'll also make the output cleaner |
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| 21:25.51 | opbolt | whitequark, oow how? |
| 21:26.12 | opbolt | theres a fancy ££ dc-dc i found https://www.digikey.co.uk/product-detail/en/xp-power/JTL3024D15/1470-2120-5-ND/4488499 |
| 21:26.40 | opbolt | and a cheaper one: https://www.digikey.co.uk/product-detail/en/mean-well-usa-inc/DKMW30F-15/1866-1362-ND/7702808 |
| 21:27.23 | opbolt | this is the tone board i am trying to power https://www.aliexpress.com/item/Updated-OPA2604-AD827JN-OPAMP-Stereo-Preamp-Pre-amplifier-Volume-Tone-Control-Board/32730560110.html |
| 21:28.22 | opbolt | the isolation would help with classic ground noise loop thingy type problem iâve been having too |
| 21:28.47 | opbolt | that or audio isolators but that risks audio fidelity |
| 21:30.18 | opbolt | besides ive blow up the last china dc-dc converter i had. some odd thing happened when i connected it to the same power supply as the amp. blow it up, buble os smoke. so i give up. just feel like splashing on fancy thing that will do the job and call it a day. |
| 21:32.18 | opbolt | worked fine when powered from another battery with dc-dc boost converter outputing 19v. meaning it was ok when i was isolated from amp power supply, which is 30v. max volt of tone board dc-dc convter was 40v. so idk why it blow up. need to learn a new deeper leave of detail to answer that. which means more time... |
| 21:32.46 | opbolt | still interested to know how i could use an inductor :) i just cant try it out anymore |
| 21:34.52 | opbolt | spend bloody £40 on many cheap dc-dc converts and a vu meter boards/modules that have gotten blow up. which is just silly. hench spending £25-£40 on a fancy isolated dc-dc is not sounding so bad... mmhhh |
| 21:34.59 | whitequark | opbolt: try google |
| 21:35.04 | opbolt | yea ok |
| 21:35.06 | opbolt | thx |
| 21:35.29 | whitequark | there are also https://www.digikey.com/products/en/circuit-protection/inrush-current-limiters-icl/151?k=inrush%20current%20limiter |
| 21:35.45 | whitequark | but you probably don't want these in a battery powered system |
| 21:36.29 | opbolt | oh? |
| 21:37.08 | opbolt | i was just larghing at the thought i could have spent a few pennys on a little thing that would have sovled the inrush problem |
| 21:37.14 | opbolt | laughing |
| 21:37.36 | opbolt | on 200ohm i see |
| 21:37.38 | opbolt | oh |
| 21:37.45 | opbolt | yea dont want that |
| 21:38.25 | opbolt | hmm |
| 21:42.23 | whitequark | opbolt: no |
| 21:42.28 | whitequark | 200 ohm is the initial resistance |
| 21:42.32 | whitequark | it's an NTC resistor |
| 21:42.39 | opbolt | oh |
| 21:45.23 | opbolt | then again at 200ohm maybe tis not so bad. the pre amp is under 100ma it seams. more like 40ma i think :/ feel i need to check that |
| 21:45.51 | whitequark | sigh |
| 21:45.59 | whitequark | please read the datasheet and understand how it works |
| 21:46.12 | opbolt | sorry stupid idk what i talking about, i thank you for you time |
| 21:46.28 | opbolt | ill have a look at the datasheet |
| 21:46.35 | opbolt | thank you |
| 21:46.53 | opbolt | time to read some books |
| 21:47.43 | opbolt | youve been very helpful in pointing me in a direction |
| 21:48.11 | whitequark | also consider this http://www.vptpower.com/wp-content/uploads/downloads/2012/01/info_inrushCurrent.pdf |
| 21:48.20 | whitequark | it offers a more complex but much more efficient solution |
| 21:48.22 | whitequark | with a FET |
| 21:48.38 | whitequark | fig 5 |
| 21:50.54 | opbolt | "Once the circuit is energized the resistance of the MF72 will decrease rapidly to a very low value, power consumption can be ignored and there will be no effect on normal operating current." ooh i see what ya mean :) i can use a cheaper dc-dc :) with one of these |
| 21:51.29 | whitequark | yes |
| 21:51.37 | opbolt | Yay! |
| 21:51.46 | opbolt | having a look at fig 5 now |