I recreated an Amazon Product to make it better & cheaper! (for Fire TV Stick)

Просмотров 512 тыс.

% 15 552

Try PSIM for free: powersimtech.com/products/psim/psim-pricing-and-licensing/download-demo/
More information about PSIM: powersimtech.com/
Free Altium Designer Trial: altium.com/yt/greatscott!
Previous video: ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-ktcuBLA3Www.html
Facebook: greatscottlab
Twitter: GreatScottLab
Instagram: great.scott.lab
Support me for more videos: www.patreon.com/GreatScott?ty=h
More project information here: www.patreon.com/posts/63950907
Parts list (affiliate links):
Resistors: s.click.aliexpress.com/e/_dTPpXjt
amzn.to/3ijSqPe
Ceramic Capacitors: s.click.aliexpress.com/e/_dU4FEsB
amzn.to/3Ig8GLH
IRL540 MOSFET: s.click.aliexpress.com/e/_A2Q9sP
TL431 IC: s.click.aliexpress.com/e/_AekHjV
amzn.to/3JlmfuP
MCP602 OpAmp: s.click.aliexpress.com/e/_dTvJRGw
amzn.to/3tiHGXS
Supercapacitor: s.click.aliexpress.com/e/_Agm02X
Perfboard: s.click.aliexpress.com/e/_dXx2Zv5
amzn.to/366Xxjq
Trimmer: s.click.aliexpress.com/e/_AWiIan
amzn.to/3JoAYVI
You can get the Buy option here (affiliate links):
amzn.to/3tivs1p
amzn.to/3CPPUtL
In this episode of DIY or Buy we will be having a look at a Fire TV Stick and its problem that you can not really power them with a TVs USB Port. There is a product out there that solves this problem but I think you can build such a circuit better, simpler and cheaper the DIY way. So let's find out how the buy option works and how can we can create a DIY solution with Supercapacitors! Let's get started!
Thanks to Powersys for sponsoring this video.
0:00 The power problem of Fire TV Sticks
1:45 Intro
2:45 Fire TV Stick current measurement
3:30 Testing the Buy option
4:00 How does the Buy option work?
5:26 DIY Supercapacitor improvement
6:44 DIY Solution Test/Explain
9:36 DIY Solution Build & Verdict

Наука

Опубликовано:

27 мар 2022

Ссылка:

Скачать:

Готовим ссылку...

Добавить в:

Мой плейлист

Посмотреть позже

Комментарии : 730

@annaplojharova1400 2 года назад

I see there one big problem: You did all the switching and sensing on the GND side. That means as it works (the current sensing, current limitting, load switching,...), it will make voltage differences between these grounds. But this GND is common with the USB communication, connected inside of the TV. That means the "fire stick supply output" GND is shorted out with the "power input" GND, once it gets connected together into one TV. You should just have made all the current sensing and regulation on the positive side (so using PMOS devices,...), keeping the one single common GND.

@eDoc2020 2 года назад

I agree. I am surprised it worked at all when he used it on his actual TV. My only explanation for that is that his TV's port already has soft current limiting, meaning he could have gotten away with just connecting the capacitors directly to the USB port power.

@ferrumignis 2 года назад

Agreed switching the ground is a recipe for disaster.

@pacaj2am 2 года назад

Yes... wow...

@greatscottlab 2 года назад

This is exactly why I wrote down "not tested for longer time" on the disadvantage side. Now longer testing would not have revealed this problem because my TV works with my solution. But if I would have other TVs to test I think I would have found this problem sooner. It seems like I ignored that the USB GND and HDMI GND are apparently most of the time connected together. In theory that should mean that charging the supercaps up and adding the FireTV stick should work just fine. But afterwards the lower MOSFET would get shorted which means we remove the current limiter. Since there are still the supercaps in parallel to the Fire Stick that should not be such a big deal breaker. But yes. I think this is a problem in my circuit which I didn't find with lab bench power supply testing and with my TV testing. This is all theory in my head right now by the way. So the problem can be bigger or smaller. Switching the positive votlage side with P-Channel MOSFETs would solve the problem. That would require a bit of a redesign but the main components should stay the same. Sorry about that.

@animatrix1851 2 года назад

@@greatscottlab Hey I'm sorry but I didn't exactly get what the above commenter explained. Could you perhaps elaborate in a yt short or a community post or even here.

@kentahirono 2 года назад

I'd added 2 LEDs to show is in charging and when ready, also a protection diode to get polarity protection and * feedback current from supercaps to tv. *Edit: avoid

@greatscottlab 2 года назад

Good ideas for improvement :-)

@jonmayer 2 года назад

Is there a schematic out there of these improvements?

@greatscottlab 2 года назад

@@jonmayer Not yet.

@vaclavzeleny5717 2 года назад

@@greatscottlab And capacitors needs some big parallel resistors for long term balancing.

@CircuitCreator 2 года назад

Go for it

@advisedpotato8983 2 года назад

Mid air circuits should be considered art

@greatscottlab 2 года назад

I think so too ;-)

@heartlessalice5801 2 года назад

and a fire hazard

@jimurrata6785 2 года назад

@@heartlessalice5801 A discharge hazard at least. I wouldn't want to be hit by those capacitors

@TheNumbuh121 2 года назад

Here in Brazil some people call them spider circuits

@nirodper 2 года назад

@@TheNumbuh121 in english it is called "dead bug"

@bluegizmo1983 2 года назад

It still amazes me that we have devices like this today that are so small and are basically full fledged mini computers that can stream 4K video while using only around 200ma of power at 5V!

@Kalvinjj 2 года назад

Hardware decoders are amazing, you can do the same video reproduction task with either gobs of processing power, or a small fraction of it with the correct hardware. I think even plain MPEG 2 video at those resolutions would put a strain on a processor with that little power consumption if they didn't have the hardware decoders, then again back at your point, it's still really impressive how said decoder can do such a feat with so little power.

@kentahirono 2 года назад

@@Kalvinjj iirc rpi3 can decode 1080p24 hevc 10bit with SW decoding and consume about 5V1A. But it has a general purpose low budget chip.

@bulletpunch9317 2 года назад

Was he streaming it at 4k?

@llspragulus 2 года назад

Whether or not it was 4k isn't the point. I'm guessing the poster is around my age. I'm 53 and remember being in computer classes where a GB was theoretical. No one believed at the time something could be so large. I remember being hot shit and paying $400 for a single 4MB SIMM of RAM. The fact technology has progressed this far is the point he/she was making. Shit, I remember a time when there was no internet.

@bulletpunch9317 2 года назад

@@llspragulus im interested in it, whether its the point or not, since there was a lot of difference in power consumption between 4k and 720p.

@Paxmax 2 года назад

Important! Pls add two similiar high ohmic resistors in parallell to supercaps!! This will help them with staying balanced! Otherwise you run risk with age that one blows up due to over voltage. Capacity may vary as they age = they will come more and more unbalanced! I approve of protype development process. I do the same.

@Kirillissimus 2 года назад

Or just use a single one. I believe there are some 5V rated ones although they somewhat rare.

@voidex136 2 года назад

@@Kirillissimus never heard of these. Max I saw was a 3v supercap. I believe 5v is just 2 in series hidden within. But who knows maybe they really produced 5v supercaps

@EVLS10 2 года назад

Not a great method. Bottom balancing on ELDCs can cause major issues because they can actually flip polarity when at 0 volts. It is imperative to never drain them down fully. Doing this can do internal and external damage.

@Paxmax 2 года назад

@@EVLS10 Not sure what you mean with bottom balancing as parallell resistors will always try to maintain 1/2 x Uin over each capacitor at all times. Complete discharge is unavoidable due to current circuit design. I do agree that parallell resistors is the bottom tier solution and cannot keep up in very dynamic situations. This design is usage is pretty chill though, where the caps will at 99.99% of time just stay hovering at 5V without much going in or out giving much time for the resistors to do its job. In the case of rapid charge or discharge; parallell resistors are much much better than nothing, as it will correct errors with enough time, as opposed to not being corrected at all. During a full rapid discharge, with unbalanced cap size there is the possibility that it will force the lower capacity cap into reverse voltage, with discharge resistors it will atleast try to minimize the time spent in error state. I can't forsee that as worse than having the cap forced into reverse voltage for a longer duration so; I'm not sure what the fuzz is about but I'm intrested to know. Adding parallell diodes would limit the reverse voltage situation, clamping it to one diode forward drop. (But if one has gotten this deep into patching, one might aswell get a proper solution like SAB mosfet, op-amp balancer or maybe a well thought out zenerdiode)

@EVLS10 2 года назад

@@Paxmax it means that your method will intentionally or not bring both cells to 0 volts after a long time of being disconnected. You are providing a constant drainage path which is a no no with eldcs

@kentsavick2516 2 года назад

Nice to know supercaps have been improved a lot. They didn't use to have any significant energy capacity. They were just for maintaining a voltage on something like static RAM, etc.

@kiwiwelch3620 2 года назад

This is opening the barrier to new invation in DIY. Love Great Scott. Miss the old intro tho.

@cac2244 2 года назад

I second getting back to old intro.

@ruslankiryan7181 2 года назад

DIY won definitely. Good idea in general and very interesting video. Thank you and good luck.

@greatscottlab 2 года назад

Thank you!

@jacksullivan1937 2 года назад

This is not regarding any video in particular but all in a whole, THANK YOU for your content I love watching them even though I sadly cant afford to do like 99% of any of it I find them very entertaining and knowledgeable I really love your style of explaining how it works or why it works that way the most Thank You again

@rickwheeler6811 2 года назад

Great stuff. I like how you take three fundamental circuits and come up with simple solution.

@greatscottlab 2 года назад

Thanks ;-)

@lasciencedelamusique6245 2 года назад

Explications are so clear, really good job. I learn so much from your channel! Thank You!

@matthewday7565 2 года назад

Might be better if the output voltage cutoff had some hysteresis, so it gets to a decent level, but will then allow it to drop to the minimum working level, otherwise it may cut off prematurely as the capacitor discharges. Could also use a boost converter so that the voltage does not fade with capacitor discharging. Finally, it appears that the switching and any drop is in the 0V side, not the +V, this would be bad if the USB ground is not isolated from the HDMI ground

@a1nelson 2 года назад

Good idea. As you’re probably aware, it’s trivial to make this tweak to the circuit presented.

@CircuitCreator 2 года назад

Charging time will increase 🌚

@taylorboultinghouse8296 2 года назад

Excellent rendition. You say the circuit is simple, but there is a lot going on. You truly have big brain, Scott! Thanks for sharing! I really enjoy your videos. They are great supplemental material for my EE degree. Take care you wizard!

@spaideri 2 года назад

Cool idea. Though I have couple of ideas to consider. Since you are charging the 2 capacitors to a combined higher voltage that they can tolerate by themselves, I would put in some protection for too high "cell" voltage. Supercapacitors (at least in the range of 100s of Fs) can be easily be damaged with too high voltage. Also the op. Amp used to turn the load on does not have any feedback to prevent oscilation when reference voltage is near the compared voltage. Just a small amount of feedback to the compared voltage would made the operation to work a bit like a schmitt trigger.

@victornpb 2 года назад

If you want to be safe you can parallel them and use a cheap booster to get 5v and a Cc step down

@Will-sc3hw 2 года назад

My tv has both 500ma and 1A ports. Although using a separate power supply is cheaper still. Good video

@hxhdfjifzirstc894 2 года назад

I didn't watch the video closely, but it seems he made a contraption instead of simply buying a USB power supply? They're only $5-$10 each, for one that does 2 amps. I don't see the point of making something like this when they're cheap and available. I did not pay attention to the video, though.

@paultakoy7091 2 года назад

Great video. Your videos inspire me to do more DIY. Your overview and detailed explanations are fantastic. Keep up the awesome work! Thank you!

@Henrix1998 2 года назад

The source limiter explanation actually helped me with my uni course, thanks

@natec1 2 года назад

I love your circuit diagrams and drawings

@pp3v42_g3h 2 года назад

The main ic is a monolithic power MP2617H. worht checking the datasheet, really cool ic, it does everything, charges the lithium cell, regulates the maximum input current and provides higher output current (from the battery) than the input current.

@ShahZahid 2 года назад

would be a pretty decent choice for a powerbank

@greatscottlab 2 года назад

Thanks for the feedback. I will definitely have a look :-)

@leondeco4835 2 года назад

how do find that IC ?))))

@Kingpin3k 2 года назад

Great video, was looking exactly for this product. thanks alot.

@mo_mo1995 2 года назад

Your mid-air soldering is art

@chaosminecraft3399 2 года назад

that is a great project. and soldering is one of the things i like.

@macswanton9622 2 года назад

A perfect learning project

@fangthewarrior 2 года назад

Scott is a wizard! He can solder components in mid air!

@kevingoodenough78 2 месяца назад

I have build a circuit like this one. what you really looking for is a HOT SWAP CONTROLLER. you can put 2 of them and chain the Pgood and Enable pins together to separate the super caps. you might also just be able to make a simple soft start circuit using a mosfet and some timing caps.

@Smartcookieibrahim 2 года назад

I love you Scott with heart...

@dalweensmith3426 2 года назад

I quit my engineering college just to learn from youtube its was cheap and reliable

@krisnaanandakusuma9426 2 года назад

I really like the way you show the resulted mid air soldered components🤣

@JjMn1000 2 года назад

thats that what that circuit is for. Now I know! All of the videos are cool!

@wolvilataniere 2 года назад

Interesting design, I thing you should probably add a voltage balancing circuit of some kind for the series super-cap, dispersion in capacity may result in premature deterioration.

@frollard 2 года назад

or at very least a 100k-1M parallel drain resistor on each so the higher cap will drain faster to some safe equilibrium while not wasting a tonne of power.

@stevetobias4890 2 года назад

Excellent solution Scott. There are a number of circuits that supercapacitors are better but manufacturers always jump to lithium ion batteries which increases prices and decrease life.

@neilritchiecaguioa8593 2 года назад

Impressive manipulation of Voltage and Current Sr. Great Scoot.ill try your Circuit on my other Devices

@LucasHartmann 2 года назад

This one is actually great, Scott!

@nosmokingnl 2 года назад

If cost is a thing I would simply use an old usb phone charger, they are >500mw. What would be handy, like a sort of PC PSU, offering different voltages, for for use outside the pc. Near my tv I have a router, nvidia shield, DAB+ radio unit. amplifier, raspberry pi. Most are 5v, some 12v. Every device has its own power supply. Why not have 1 power supply, supplying power to all devices. This is probably more efficient too (less watts). And as a bonus, being able to turn on/off per device.

@dominicmillerca 2 года назад

You're a genuis! I love your videos! 😍

@mr.capacitor7301 2 года назад

Yah I am still right to guess the circuit in the the post sent by great Scott and is happy to find out that it is exactly the same thing 😀 😄

@jacquesb5248 2 года назад

dude you are brilliant!

@piiumlkj6497 2 года назад

well Scott , you're great !

@dinodubroja7433 2 года назад

Your perfboard skills are incredible. Could you please make a video where you give us little tips and tricks?

@keithking1985 2 года назад

DIY WINS FOR ME ANYWAY : ) cool little circuit you made there. plus i never knew that about those TV sticks. SO THANKS FOR THAT BIT OF INFO ; )

@dangersdnb 2 года назад

I think I'd rather power with an external supply over this solution tbh. In the past I've used a relay to turn off the device when I've required a synced power down.

@whoknows8225 2 года назад

exactly my thoughts, you could tap from the mains inside the tv to connect a seperate 5v powersupply that offers enough amps, add a usb port to the tv and connect a relay in between.

@richardlighthouse5328 2 года назад

DIY is always a winner if you try hard enough.

@nEuDyYT 2 года назад

Amazing work! That circuit is genius and the possibilities to use is infinite 👍

@greatscottlab 2 года назад

Thanks👍

@AnubhabKundu 2 года назад

Great Scott on 🔥🔥

@MicSokol 2 года назад

Kudos for beating a major manufacturer with better design! For me this is way above my capabilities to make, I would just hook up a phone charger to the 220v TV cable and use it to supply voltage to the Fire Stick.

@IanSlothieRolfe 2 года назад

While I don't really have a use for a Fire Stick or similar, I think Thist is a very interesting idea for averaging current draw in many applications - I can imagine it would be a great way to power remotely installed solar powered devices that have an occasional need to draw extra power (to operate a motor or servo etc). I'll be bookmarking this :)

@kadegreen5356 2 года назад

Great vid. The DIY vs Buy decider for me is whether this is a general circuit that can power a generic device with a USB source or if it is purpose built for the firestick.

@sparkyindahouse 2 года назад

clever stuff mr great scott

@greatscottlab 2 года назад

Thanks ;-)

@rubabmubarrat Год назад

If I had an "unsmart" tv and needed a fire stick, I would just power with a phone charger laying around. As the USB shuts down at 500+ mA, there is always a risk of frying the motherboard with super capacitors' high initial current spike. However, the buffer circuit is quite good at maintaining it under 500mA and offers all necessary features as an energy reservoir. anyone needing this kind of technology should definitely give it a try.

@shader26 2 года назад

Love your channel. Such well thought out and excellent explanations. But I wish I knew where you get those pens! You write perfectly and the pens are really nice!

@cabasse_music 2 года назад

i love the DIY (comic sans) or (impact) Buy (arial wordart?) font choice also, that circuit is ART man

@stargasm1000 2 года назад

This seems like a considerably better alternative that would've been considered at a design discussion meeting during the planning phase of the commercial product. Such a design is so much better that I really wonder why it was not chosen.

@rodneysmith1750 2 года назад

Great video today Scott, certainly enjoyed this one even though I don't have a FireStick. It seems like I spend too much tie watching RU-vid and not enough watching TV...

@alexhudspeth1213 2 года назад

One step closer to removing battery storage from our devices. Bravo!

@redoinebotram2509 2 года назад

Hello nice video, in the AMAZON product the first IC is an MP2617B from MPS that is Power Path Management/limiter for single Cell Li+ Battery.

@ianstorey1521 2 года назад

A great use of supercaps!

@onsafari 2 года назад

Thank you for another brilliant and inspirational video. 👏🏻 👏🏻👏🏻

@greatscottlab 2 года назад

Glad you enjoyed it!

@edwardfletcher7790 Год назад

Fire TV sticks are frickin' AWESOME 👍

@TrickyNekro 2 года назад

DIY definitely a winner, simpler and functionally better.

@chillydickie 2 года назад

This is awesome. Plenty of usb powered devices that have this problem - undercurrent or undervoltage. Would be great to have a revision to this!

@Indraneel_Ray 2 года назад

The intro is great!!!

@erfanwork7506 2 года назад

Your sound and mic is very good i love it

@greatscottlab 2 года назад

Thanks :-)

@technomicah 2 года назад

I love how you still have a 123D design icon on your desktop

@guatagel2454 2 года назад

Nice, thank you! Supercapacitor will replace batteries on small power applications.

@greatscottlab 2 года назад

Definitely possible :-)

@tylerwebster660 2 года назад

Great video!!!

@MatthewBryce 2 года назад

Or plug it into a 1amp wall adaptor, that also means its powered when the TV is in standby (if your TV doesn't power USB whilst I'm standby) and you can also turn on the TV by issuing voice commands

@davidfarid3741 2 года назад

i want to learn how to build circuits like this 😁 you should write a book

@mrtechs2305 2 года назад

first i thought that you would recreate the amazon fire tv stick!!

@blanana_m 2 года назад

Your free air soldered version can even be used as a smoke machine!

@ANANTHASANKAR_UA 2 года назад

DIY Wins 👍👍 The super capacitor is promising one, It act as a big reservoir. I have faced same type of problem with screen cast device.. Finally fixed it with 2200uF 25v capacitor along with 5v supply.

@greatscottlab 2 года назад

Thanks for the feedback :-)

@jondoe79 2 года назад

Amazing GreatScott 😎

@greatscottlab 2 года назад

Thanks 👍

@computerstar2000 2 года назад

A modified version of this circuit which can handle a 24v input would be super useful for 3d printing guys (like me) who run Octoprint. 🐙 As you can use a simple momentary button to shutdown a RPI safely, if the circuit could take a 24v input and when the input power is switched off, provide a momentary connection between GPIO3 and GND, the RPI could shut down safely when you turn off the printers main power switch with the super caps providing enough power to allow the RPI to complete its shutdown procedure. Great video.

@antonisautos8704 2 года назад

If you plug your outlet is close enough you can actually swap the outlet out for one with a USB port that'll power the device. I have one and I believe both ports output 3.6 amps. Which would be enough for the firestick. Also the outlets are about 20 bucks. If you're good with changing an outlet and faceplate it would be simple task.

@brythecracker 2 года назад

Great Scott, Great Edutainment! I’m curious about when you build your beta circuit in free air. Do you prefer to build this way because it allows you to understand the circuit better? Do you prefer free air vs breadboard? Do you prefer free air because of convenience, easy vs hard, fast vs time consuming? Some videos of free air circuit construction can be more entertaining than the actual circuit application information, personally I prefer deeper material like yours vs the “Sensory Satisfaction Art”, but a balance is a good thing. I ask you the free air construction question because if there is real value to it, vs breadboarding, I might be willing to give it a try. Thanks 🙂

@L0000NEY 2 года назад

I got so excited thinking you were going to make a DIY android TV device.

@lelandclayton5462 2 года назад

In my line of work as an AV Integrator I have to deal with these blasted firesticks. I have seen newer TVs come with 1A rated USB ports that is great so it can be powered from the TV. It's kinda hard to mount a TV and have a USB wallwart sticking out three to four inches from the electrical outlet, doesn't let the TV lay flush and screws up stuff. Never know what equipment the customer has until I show up. Would be nice if the HDMI 2.1 spec could use that +5V pin with around 800mA to 1A of current so stuff like the firestick and chrome cast can be powered from the HDMI port itself.

@apostolosgeorgiadis3670 2 года назад

I like your videos that you compare the ready solution with diysolution. I recently bought from lidl a car battery starter. It would be a good idea to make a video that you ll present the diy car battery starter

@Cr4sHOv3rRiD3 2 года назад

I personally think that your DIY version is better considering that have super capacitors instead of battery, much better solution. For example, i use DIY power bank made by myself with super capacitors to start up my car instead of regular car battery. Much better, much clean and more reliable, and the life span is much bigger than regular acidic battery, as well as it is smaller and "environmental friendly" compared to Lead-Acid regular car battery. Great video and great channel thumbs up

@andidegn 2 года назад

Hi. I'm pretty sure the first IC is an MP2617 3A Switching Charger with NVDC Power Path Management For Single Cell Li+ Battery

@TiagoTiagoT 2 года назад

Perhaps combine the two approaches, allowing for a quick first-time boot up with the caps, and then later, even faster boot ups by using the batteries just temporarily to cover for any charge the caps may have bled while the thing was powered off, using the batteries a lot less than if they were the only thing there?

2 года назад

Could this also work as a rudimentary UPS to make the connected device survive short power downs?

@pauljackson2126 2 года назад

He used Super Capacitors and not a Li-ION Battery. It's job is to only deliver required short current spikes while being powered by current limited input and not to be used as UPS I think the Buy Version is capable of that stuff.

@resneptacle 2 года назад

@@pauljackson2126 He did show however that you can power the TV stick for up to two minutes in this configuration, longer with larger/more caps

@Ramog1000 2 года назад

@@resneptacle then again larger caps means longer charging time

@pauljackson2126 2 года назад

@@resneptacle actually, if you want to keep it only on for like short period, then I guess you can use higher power caps to make a poor man's UPS

@AtlasReburdened 2 года назад

Sure, just depends on the down time you're looking to accommodate.

@meatmanek 2 года назад

It might be overkill, but I'd love to see a version of this circuit that uses a buck converter to charge the supercap (so you aren't burning half the energy when you initially charge the caps) and a boost converter to make the 5V output (so you can drain the caps lower than 4.5V and use more of their energy storage capacity). You'd be able to start the Fire TV before the capacitor is fully charged with that sort of design.

@Gal3tti 2 года назад

great video, i think i will try it also for my fire stick, maybe i will design a pbc with Easy EDA

@MCsCreations 2 года назад

Fantastic! I didn't know about that thing! 😃 I was waiting to buy 2 new smart TVs... Now I'm getting 2 of those! 😂 Really great work as usual, dude! Stay safe and creative there! 🖖😊

@JackTheAwesomeKnot 2 года назад

You dont need his crap to use the fire tv stick. Just plug it in to the wall

@MCsCreations 2 года назад

@@JackTheAwesomeKnot I didn't even say anything about it. Take care of your own life.

@ranaharsh365 2 года назад

Finally.... PSIM is sponsoring. I was thinking that only newbies like me uses PSIM.

@ARE123CKI 2 года назад

Brilliant!

@DoctorX17 2 года назад

The chaos gremlin in me loves the messy circuit, lol

@dz-abouttechnique1849 2 года назад

Nice video!

@kirkkohnen5050 2 года назад

Circuitry in the ground side is a bad idea, as noted in other comments. Potential imbalance of the capacitor voltage is also an issue. There's a simpler approach: Use a 5V, 500 mA bulb to current limit the input current, and charge the series capacitor pair (with 4 silicon diodes forward biased across each capacitor to limit the maximum voltage on each capacitor). The light bulb will run at the typically lower current, the filament won't get hot, and it will have a resistance of far less than 10 Ohms. The light bulb won't ever wear out because it's almost never being lit up. Voila! No problems with circuitry in the ground path, no capacitor voltage imbalance issues, cheap and easy!

@JamesFraley 2 года назад

Looks a bit intimidating? Boy are the head of the understatement guild!

@jonmayer 2 года назад

I also thought using a lipo was not a great idea. Trickle charging like this would be good for NiMH cells too. I do like the super cap solution too. Ok further watching and this is awesome. I need to make a few of these.

@robywankenobi32 2 года назад

I've seen some high end charge management chips for Li-Ion charge the battery to only 80% capacity - e.g. 4volts instead of 4.2volts, this doubles or triples the life span of the cell, other ways of doing this too is to allow the battery to fall to 80% from fully charged, doing a smaller charge back up to 4.20volts, meaning the cell is never heard at fully charged.

@jtveg 2 года назад

Thanks for sharing. 😉👌🏻

@_Funtime60 2 года назад

I just ran into my own case of battery VS capacitor. The raid card I was trying to use required a battery backed ram cache to enable RAID 5. While searching for one I realized that they also made flash backed ram cache modules. These use a capacitor to dump the ram to flash when the power cuts out. The capacitor is rated for 80 seconds of use, while the identically sized battery is rated for 3 days. However the battery is only rated for 3 days for the first 3 years, and if the power is out for more than 3 days I'm stuck. With the FBRC I can last indefinitely without power and the capacitor can last longer than 3 year.

@ric_dk-9520 2 года назад

I used a other comercial solution... A network dungle, that both supplies power and wired Ethernet to the Fire stick, and it was as I remember, even cheaper than the USB power thing...

@amirfathirad2965 2 года назад

dear scott wuld you please make a video about how to make amper meter and volt meter please you really teach very well

@SheasBathLab 2 года назад

The adapter he's talking about for sale on Amazon has some reviews that say it doesn't work after some use. It may work for a bit before failing and causing the Fire TV to restart over and over in a loop

@maxsnts 2 года назад

I have used a powerbank before in situations like this. Not ideal, but it works.

@Xenro66 2 года назад

7:21 That's gotta be the biggest mid air spaghetti I've seen in quite a while lmao

@greatscottlab 2 года назад

It is art ;-)

@Raress96 2 года назад

Laughed way too much at the "This monstrosity" part with the sound effects :D (7:16)

@thisfeatureisbad 2 года назад

A lot of TVs like Samsung will power off the USB ports after turning the TV off. But still, some TVs have USB ports powered even in standby mode.

@Oliver-l1c 2 года назад

Yup, same problem with my TV.

@sebascarra 2 года назад

Yea this would make the battery solution better. Maybe a supercap+battery hybrid would fix this issue. Using USB C would be the way to go to have data and power all travelling through the same port. You could even forget about HDMI this way, and USB C wouldnt have the top current limit