What are
/r/ElectroBOOM's
favorite Products & Services?
From 3.5 billion Reddit comments
The most popular Products mentioned in /r/ElectroBOOM:
The most popular Services mentioned in /r/ElectroBOOM:
Odysee
Desmos
SemanticScholar
Kapwing
Rainmeter
TeeSpring
The most popular Android Apps mentioned in /r/ElectroBOOM:
Gboard - the Google Keyboard
Slide for Reddit
EveryCircuit
The most popular VPNs mentioned in /r/ElectroBOOM:
The most popular reviews in /r/ElectroBOOM:
For those interested in the linear algebra side of things, I made something in Desmos that works with any continuous function, and even some piecewise functions. https://www.desmos.com/calculator/qyds2wfuz0
I used a 10kv, 30ma Neon Sign Transformer, I'll put the link for the one I used. It's cheap and pretty powerful, you can get bigger ones but this one was perfect for me
Now, I haven't watched the video, but based on the thumbnail this could be real. The capacitors shown appear to be a common supercap, roughly ~100f up to 500f (yes, FARAD) 2.8v. I have two, they each output at least 20 amps short current, and I say at least because my multimeter blew out (20 amp fuse). With proper circuitry, you could probably make a super high capacity phone charger bank, but it'd probably be a piece of garbage since capacitors aren't batteries and don't hold charge for very long. And trust me, it takes days to charge one of these at 2.8v, you want it to last.
I make good use of my DSO 138 oscilloscope! I got mine as a kit for like $18 a few years ago. They seem to cost a little more now, but a cheap oscilloscope is waaay better than no oscilloscope! https://www.amazon.com/DSO138-Oscilloscope-Digital-Electronic-Learning/dp/B07SL8KQPZ
>What is an effective way to get it?
Spend ~15$ and buy it. The most effective way.
https://www.amazon.com/Magnet-Enameled-Copper-Winding-Crafts/dp/B01EMGMMU8
This wires are widely available everywhere. Look in your local hardware store.
If you have a source of free transformers - you can salvage some wire from them (just skip potted ones). Classic line transformers, powerful relays and electromagnets, audio-grade inductors (from crossovers, big ones with ~1H inductance), even degaussing coils from CRT monitors..
>Would the winding in transformers be enough?
Typical step-down transformer can have many thousands turns of wire on their cores. Transformer with a size of your hand should have enough wire for your TC. But i still recommend you to buy a new wire.
>I was wondering about the metal detector wand he's holding
https://www.amazon.com/Handheld-Detector-Adjustable-Vibration-Sensitivity/dp/B08PV79BNF
This one with a different brand\sticker. Sensitivity of this wands are not that great, 20mm steel ball can be detected from a 2.7 inch distance (~7cm) - barely or not enough to detect a small vibrator \w circuit deep inside a chess butt.
Some car stereos have the capability to decode files over USB via the 3.5mm aux input, this adapter is only for use with those kind of stereos. https://www.amazon.com/Adapter-Female-Converter-Oxsubor%EF%BC%88CAR-Function%EF%BC%89/dp/B0794R6YCJ
LOL i just spot "Nooo hahahah the joke is that im using a digital interface(usb) for an analog signal without any adc lol. Its just a cursed “adapter”"
So this comment is irrelevant.
But in attempt to give this comment some value i gonna say next: as i remember there is some kind of equipment that use USBs (connectors) as mean of analog audio port. I believe it's like 10s port-minigless-use-shitload same as jack 3.5 was used for power.
~~Really? Can you imagine you CAN'T "transform" ANALOG audio signal to USB (Universal Serial Bus (DIGITAL)) signal, with just wire.~~
~~Here~~ ~~is what you need.~~
Look here
Here's an example: https://www.amazon.com/Hobby-Fans-Waterproof-Brushless-Off-Road/dp/B09FG5WWRV/
It is probably not what you want, but that's because you told us very little about what the motor is supposed to do. Impellers can be very small or very big, and spinning one at 20k RPM can take anything from watts to megawatts.
The simple answer is to buy a a 12 volt DC inverter. Like this one... https://www.amazon.com/BESTEK-Inverter-Converter-Charger-Listed/dp/B07JJSW48V/ref=sr_1_12?crid=24Y1JVDWIST8C&keywords=dc+inverter&qid=1658607093&sprefix=dc+inve%2Caps%2C156&sr=8-12
Also bought some cheap laser pointers (https://www.amazon.com/Laser-Pointer-Indoor-Interactive-Chase/dp/B09LVQZ9CZ/ref=mp_s_a_1_3?adgrpid=56394432152&gclid=CjwKCAjwoMSWBhAdEiwAVJ2ndmygRxK2eFz2inXmUbeSe1QzhEphGmG4CKCbpNdmqSnqLvCLtY7lPRoC7PIQAvD_BwE&hvadid=274727273893&hvdev=...) so I can remove the laser diodes and try to make cool laser circuits.
If you look at the very beginning of the video, it looks like the vent tube goes out the window. So at least he's got that right.
You could probably get all the necessary parts by buying a small dehumidifier - this one is only $35 from Amazon.
But I agree, it's a very weak, very inefficient air conditioner.
Car based electronics use an interface called CAN to communicate, you might need a CAN bus to stereo converter. Something like this, specific to your radio type I guess. Also each word probably means something like LR -> left rear, RR -> right rear etc for each speaker in the car
Consider getting yourself one of these: https://www.amazon.com/ProsKit-900-015-Helping-Hands-Soldering/dp/B002PIA6Z4
It'll make things very easy.
Kinetic energy sorry, One of these:
Kinetic Art Perpetual Motion Machine Desk Toy for Home Office, Perpetual Motion Simulator Non-Stop Rolling Ball Toys Science Physics Gadget, Newtons Kinetic Desktop Decoration Toys https://www.amazon.com/dp/B09YYCL15M/ref=cm_sw_r_cp_api_i_9QGCFQPSMT94G58MHMMW
Have energy be harnessed from a magnetic rolling ball and a “rotation reed switch” (I’m drawing a blank on what this would be called)
This guy.
Deal of the day: TP-Link TL-WR841N 300Mbps Wireless N Cable, 4 Fast LAN Ports, Easy Setup, WPS Button, Supports Parent Control, Guest Wi-Fi Router https://www.amazon.in/dp/B001FWYGJS/ref=cm_sw_r_apan_i_dl_BD09E7EC4S6VVJ3ZVPKS
Yep, "Perpetual Motion" toy, one of its kind. There is a circuit and a battery inside its wooden box that adds a little bit of energy to the ball so it can continue moving.
>The machine measures 8.66 X 7.87 X 4.72 inches and comes with a Built-in removable lithium battery
This toys exist in a hundreds of different variations - rolling balls, gyroscopes, balancers, wheels, swings, etc..
Vikenar Ignition Coil + D8EA Spark Plug Kit Compatible with 150cc 200 250er Pit Quad Dirt Bike ATV Buggy https://www.amazon.de/dp/B08KTBFVQK/ref=cm_sw_r_cp_apan_i_A67KANZF8PQF0GJP03MA?_encoding=UTF8&psc=1
No, the video is not about ESD because of 2 reasons:
- He literally says "all the dirty radiation and electricity flows through you"
- He is using an EMF meter. This one if you want a link.
Also, that's not the only reason this video is stupid. One of the most stupid things about this video is that he says the radiation is causing cancer. This is how people get trapped into believing some new technology is bad for them, especially when tons of research and effort is put in to make sure it is safe.
It would probably be easier to open the unit and see what voltage rails it uses. It likely uses more common DC voltage rails like 24,12,5,3.3 so replacing the power supply that take a 240v 50Hz input with one that takes 120v 60Hz but outputs to the same DC voltages would probably work.
Otherwise you would need to get a US to UK Step Up Power Converter (this one is 1000w) of sufficient wattage.
You could look for rubber Exercise Bands Similar to these. Those ones are a loop but only 2 inches wide. These ones are 6 inches wide, but not a loop, so you would need to use glue that can bond to rubber to make a belt with them.
That depends on what size it is. I have made small ones for science fair projects and just used a rubber band for the belt. I can also recommend looking at the belts and pulleys used for small CNC or 3D printer stepper motors. Something like this.
https://www.amazon.co.uk/dp/B07BMQ578Z/ref=cm_sw_r_apan_glt_fabc_KTS65NM1G7CHY97BTTSZ?_encoding=UTF8&psc=1 This one looks semi decent. 10 quid in the UK couldnt tell you in rupee though. Should be ok
i have got a link of Amazon its a great deal approx 150 rupee DT830D LCD Display Digital Multi-meter Digital Multimeter (Yellow Color) https://www.amazon.in/dp/B08Y82D69V/ref=cm_sw_r_apan_glt_fabc_WESXTTA5REWKHE03YS2J
I just found these.
So they do make 12v alkaline ones.
I just found this
I guess Duracell does make them.
Who knew. I figured the same thing stacking coin batteries.
In general, no they are not interchangeable. However, in some DC circuits you could use capacitors in place of a battery. Such as in these kind of Dynamo flashlights where a small Super Capacitor is used in place of a battery. Or this video that shows a DIY ebike powered by a bank of Super Capacitors.
The trade off is that Capacitors have a much lower energy density Vs. batteries, so for the same size, they hold much less power. However, a Capacitor can charge/discharge the power it does have at a much faster rate than most batteries, so they are good for rapid recharging or dumping a large amount of current in a short time, but would need far more frequent re-charges. Also Capacitors would be better for very long term (at no charge) storage without any maintenance, which is why they are good for those dynamo flash lights.
Im looking at a small motor like this one to drive a 2 rollers connected by a belt drive.
https://www.kapwing.com/resources/baka-mitai-dame-da-ne-meme/ is pretty simple, but i highly suggest you use a different video editor like clideo instead of kapwing (you'll also have to download your audio, sorry)
He recently posted this in the Youtube community tab:
I think we should at least commend OP for questioning whether or not it’s safe. Despite this being a reasonable adapter, there are plenty out there that definitely should not exist. Example: Parkworld 885477 Adapter Cord 5-15 Male Plug to Locking L14-30 Female Receptacle (8 inch) https://www.amazon.com/dp/B071L4S7SQ/ref=cm_sw_r_cp_api_glt_fabc_1BV0FYYACFXE333S2T6P?_encoding=UTF8&psc=1
The board in there is a DC voltage booster to take the 3v from the two 1.5v batteries and step it up to 5v to power the LED, but also a small chip that controls the button presses to turn it on. These types of chips will usually also allow for multiple functions of the light such as high and low setting or a flashing (S.O.S.) function. If you don't mind loosing the other functions and just want simple on/off, then you could try replacing it with just an on/off switch and use a DC step up converter that will take lover voltages from 1.5v to 4.2v and step it up to 5v. just place the on/off button between the battery and the step up converter and it will not drain the batteries when not in use.
You could also try making a Joule Thief circuit to power the LED, but that is a little bit more work and harder to regulate the output.
you could also just add a battery cut off switch between the batteries and the board, but then you would have to turn it on twice in two switches for it to work.
Thank you for your detailed answer.
The reason I was curious about the wattage calculation for switches is because I have seen others that appear to work this way - it can handle about twice the amps at half the volts: https://www.amazon.com/Solder-Wired-Rocker-Switch-Toggle/dp/B07B9RPLZD
​
I like to ask because you never know if the amazon/ebay/other cheap outlet is labeling this stuff accurately. Thanks again.
You can but a laser for CNC laser etching machines on Amazon like this It would not be as fast, but can do the same thing.
don't do that thing just buy a Buck-boost converter and connect your 12v 3.5amp charger to it
It’s not the laser pointer, it’s all the copper wire. Copper wire on your wrist cures almost everything. For whatever the copper wire doesn’t cure you use neodymium magnet rings. Don’t use a cheap knock off though, go for the original Alex Chiu Immortality Rings
(clearly not a faintain because it's a loop) but these things do something similar: https://www.amazon.com/Schylling-KS-Laser-Loop-Toy/dp/B0728GVYT4
And I bet if you did that with just half a string you'd get a pretty fountain thing going. I don't know what, if anything that helps show. That cutting the string for physics toy in half is jerk move just to see what 2 people are ranting about.
No you can't I recommend to buy a real scope for a decent price range and quality. I suggest you buy this scope: https://www.amazon.com/Hantek-DSO5102P-Digital-Storage-Oscilloscope/dp/B08Y7LC756/ref=sr_1_5?crid=2TC1VBMXKP7CG&dchild=1&keywords=hantek%2Boscilloscope&qid=1630029635&sprefix=hantek%2Bosc%2Caps%2C224&sr=8-5&th=1. Has good bandwidth, sampling rate is ok, and has a Signal generator built in!
You buy a volt meter like this, but one that goes to 1 million, then you get a ruler and measure how many mm are between the zero an 1million mark, then you get a piece of string and cut it to the exact length of the measurement, then fold the string in half so the ends are touching. you now have a string that is exactly half a million volts long, easy.
nah you would need a 10 amp supply because well most drill motors especially the brushed ones consume up to 7 amps to turn a wood deck screw. This is a good beginner supply. 3mv ripple output and a good enough display accuracy. 30v 10a variable Switch Mode DC power supply
If I bought this would it charge the capacitors quickly?https://smile.amazon.com/gp/product/B07R72D7DJ/
​
If so can you recommend an inexpensive 12V power supply preferably a rechargeable battery that I could get on amazon. Or could I just get a 12V adapter for some kind of electronics, cut the end off and use that?
Joytech Mini Tesla Coil Arc 5V 1A USB Wireless Transmission Experiment Education Desktop Toy Model XX03 https://www.amazon.com/dp/B07Q4377TZ/ref=cm_sw_r_cp_api_glt_fabc_BF3Z3G19NQ7XMRJ8NNB2?_encoding=UTF8&psc=1
I just ordered a cheap 10 dollar one that you assemble yourself from Amazon. Here's the link https://www.amazon.com/HiLetgo-2mA-3A-Adjustable-Regulated-Protection/dp/B01NBE97WH/ref=mp_s_a_1_5?dchild=1&keywords=variable+power+supply+kit&qid=1620834124&sr=8-5#
Just be careful with it, it peaks at 3 amps which can do some serious damage if you arent careful
If you're talking about me, then no, I wasn't talking about single phase. 3 phase comes with a neutral wire.
Here's a typical turnlock 3 phase plug for an industrial outlet. It has 4 conductors, because you want that neutral wire, just in case.
Likely because you are using a bread board and not a pcb because bread board can only handle only 1MHz and a tesla coil frequency is usually around 10MHz. Go get a kit: Amazon.com: Wangcheng Tesla Coil DIY Kit Desktop Toy Model (Medium Tesla Coil): Industrial & Scientific
I think the smart dot is nonsense too. recently I found video claiming"smart dot last forever and dosen't need to recharge" THE SMART DOT DOESN'T NEED TO RECHARGE BECAUSE IT IS A STICKER MANIPLULATING PLACEBO EFFECT, AND USING SMART SMART SCIENCE WORDS TO TRICK PEOPLE TO THINKING THEY ARE TRUST WORTHY EVEN THOUGH THEY'RE NOT!!!! (sorry if I seem a bit too agressive, but I am angry how smart dot can do this) and wait there's more like the F-ING SLEEPDOT!!! and if you go to amazon you see it is $34.50 and at least 234 people bought it and got scammed. and the reviews are something else.
It’s a pen-like tool that literally sucks the solder away from your PCB. You may have heard of it as “solder sucker” (or at least that’s what I read on the internet, English it’s not my native language)
Just for the reference: https://www.amazon.com/WEmake-WM-SP4-Solder-Sucker-desoldering/dp/B0002KRAAG/ref=zg_bs_8107034011_3/141-4037992-3944845?_encoding=UTF8&psc=1&refRID=EJFPJMC1XY97Q6S0R6QC
As much as I'm sure this person is a complete loon woo-woo snake-oil salesperson, the demonstration is probably totally legit. A weak electric current can definitely flow through both of their bodies and complete the circuit on the toy. There will be an electrical contact on either end of the toy, and as long as there's a connection, it'll make the sound and flash the lights.
Here's a similar toy, for sale on Amazon.com https://www.amazon.com/dp/B004K0DSDC/
A 30v 5A power supply is generally a good range. My power supply is 30v 10A and has been doin me good for the last few years. If you are looking for higher voltages, use a buck boost converter that can reach that voltage. But dont ask me, do what you think is best suited for you. Kungber DC Power Supply Variable, 60V 5A Adjustable Switching Regulated DC Bench Linear Power Supply with 4-Digits LED Power Display 5V2A USB Output, Coarse and Fine Adjustments with Alligator Leads: Amazon.com: Industrial & Scientific is a cheap power supply that is pretty decent to some extent. It also provides different power supplies with varying ranges.
That’s cool Now I found a USB one on Amazon That just can’t be that safe they are listing it apps a toy If you want to check it out I’ll past the link
It’s fake, it is not a real product. It is a gift box to prank your friends to make it look like you gave them a shitty gift before they open it to see the real gift inside. https://www.amazon.com/Prank-Pack-Hot-Lips/dp/B00P9L9NAI
I have zero idea what this is supposed to show. You linked home depot prices for GFCI outlets which has nothing to do with anything.
This is what were are talking about here. You can find these in every corner hardware store in asia for under two dollars.
https://www.amazon.com/ICEVEIN-Universal-Travel-Adapter-Converting/dp/B07BQPTXPG/
I can't even guess what made you think that link made sense.
Probably not worth the price of a proper balance charger. The cheapest nice one I can find that isn't sketch as frig that I own is this one by toolkitrc.
just buy one https://en.wikipedia.org/wiki/Uninterruptible_power_supply
they're not even that expensive, and will be way safer than whatever you come up with
https://www.amazon.com/APC-Battery-Protector-Back-UPS-BE425M/dp/B01HDC236Q/
Yes it's safe if your lamp is powered by a battery.
And make sure you don't short-circuit anything.
Also be aware that the relay is always on so it will be always consuming a small amount of electricity.
If you can, it's better to buy a 12v relay module like this
I have a few of these trans formers powering my power supplies
I have a few of these Transformers powering my power supplies transformer
These magnetic charger/powerbank things exist. Here's a non-payola amazon link for the pretty pictures:
https://www.amazon.com/Olight-Universal-Magnetic-Charger-Batteries/dp/B071NZ5S3F/
I haven't seen the model they show before. Also, I'm not sure of the battery type but they could be skinny li-ion ones. Regardless of battery chemistry you will have to boost convert to get to 5v. for charging
Exactly, the Autowit super cap doesn't have a battery inside. As they say, it's a batteryless unit. Amazon link: https://www.amazon.com/autowit-Battery-less-Ultra-Safe-Emergency-Technology/dp/B079HL6MMM/ref=sr_1_2?ie=UTF8&qid=1532583685&sr=8-2&keywords=autowit
Here is the module, in case anyone wants to build their own ~~touchlamp~~ touchcat.
Here is the module, in case anyone wants to build their own ~~touchlamp~~ touchcat.
If ever you work around electronics and think the static discharge could be a problem and damage what you're working on, you can always grab an anti static heel strap which will help dissipate the static in your body and keep you from shocking things.