I miss the good 'ol days of just shorting the leads with a screwdriver.
@IMSAIGuy
7 ай бұрын
I've welded a few screwdrivers to caps
@RK-kn1ud
7 ай бұрын
@@IMSAIGuy Try preconditioning the screwdriver first on smaller low voltage caps. If you convert the screwdriver tip into a carbon resistor it will discharge the large caps more slowly!
@PlaywithJunk
7 ай бұрын
I use a 50 ohm resistor for high voltage caps
@bayareapianist
7 ай бұрын
I screwed an expensive audio amp when I opened the lid and my screwdriver accidentally hit a big cap. I didn't care about the screwdriver but after that I had to listen to a hummingbird singing along with my speakers.
@PapasDino
7 ай бұрын
Hmm, reminds me of high school electronics shop - charging a cap up and leaving it on the workbench. ;-)
@PlaywithJunk
7 ай бұрын
Oh... it's for AC capacitors too! I didn't know that caps can store AC 🙂
@richysradioroom
7 ай бұрын
Must be those cheap Chinese capacitors LOL
@felipehcraftgamer4193
7 ай бұрын
They not store ac only dc!
@_nemo171
7 ай бұрын
🤣
@PlaywithJunk
7 ай бұрын
@@felipehcraftgamer4193 Really...??? Oh man! If I only knew that before... PS: You missed the joke! 🙂
@dr.robertnick9599
7 ай бұрын
It is a rating for unrectified AC voltage. The 450V AC rectified is almost equal to the 650V DC rating. There also are AC caps, which will stay at the voltage level they had in the moment they were unplugged and can also reach the rectified voltage. Technically their voltage can even exceed the AC voltage peak, if there is also an inductor, which discharges it's energy into the cap.
@glasslinger
7 ай бұрын
I think you should build one using an arduino to control the discharge. Make it really complicated! Be sure to have it WIFI capable too! Otherwise use a 50 ohm 5 watt resistor and be done with it!
@TheDigitalAura
7 ай бұрын
Obviously it would need a full color OLED display and GPS.
@RK-kn1ud
7 ай бұрын
@@TheDigitalAuraSince it's IOT enabled, it should require that it phones home once a month to verify your subscription!
@TheStuffMade
7 ай бұрын
Might want to use an ESP32 as Arduinos don't have the power to update high res displays at 30+ fps. plus you'd need both Bluetooth and WiFi. You could pulse the shorting resistor while monitoring it's temperature while displaying remaining voltage plus an estimate of how long it will take to reach zero.
@bobisyouruncle1
7 ай бұрын
My sentiments exactly 😂
@pvc988
7 ай бұрын
Don't forget to add two factor authentication and send usage statistics to Google cloud services so it can be then analyzed and appropriate ad be displayed in the middle of discharging.
@bobwatkins1271
3 ай бұрын
That would have been useful a few months ago when I was working on a switching power supply. I was discharging the big capacitor on the primary side through a resistor attached to a pair of clip leads. It worked great except for the one time that I forgot to disconnect power before discharging the capacitor. It was spectacular! After the fireworks display, I was left with a rectangular pit in my workbench (i.e. my dining room table) with black scorch marks all around it. Fortunately, the table was one of those rustic slab tables, so I was able to convince my wife that the damage looked like a natural flaw in the wood.
@TheStuffMade
7 ай бұрын
Seems a bit complicated when a simple resistor will do the job. Of course you'll need different values for discharging a CRT at kV vs a tube circuit at just 100s of volts. Also never forget that capacitors will regain voltage after you discharged them, so you will want to short them with a wire after discharging to keep the voltage at zero.
@MrMersh-ts7jl
7 ай бұрын
Is there a way to contact you outside of KZitem? I'd like to discuss/provide some feedback for the analyzer suite. You graves us with.
@willthecat3861
7 ай бұрын
They do eventually self-discharge to a few volts, to nothing.... but, the big ones might take some time. And it's the high voltage ones that need to be respected...if one doesn't want to die.
@GalgoczkiAdam
7 ай бұрын
Nothing better than a 230V, 5W light bulb. It's so scary when it lights longer than 2 seconds.
@igormorozov6801
6 ай бұрын
or 3 lamps 230v in series for VFD power bus 540v with inrush current limiting detail: 10-20R resistor or some PTC/NTC.
@inse001
7 ай бұрын
This thingy will blow up rather quickly when you really connect it to 450VAC as the MOSFET will have to dissipate >30W. The advantage of such a circuit over a resistor is that you can use it over a huge voltage range and you have an indicator that clearly tells you when the cap is discharged. I made a similar tool for work as we had to discharge 200V electrolytics. I put a PTC in the current sense to prevent thermal destruction in case of abuse.
@Mr.Leeroy
6 ай бұрын
what's wrong with good old incandescent lamp?
@inse001
6 ай бұрын
@@Mr.Leeroy Absolutely nothing except it’s too low-tech
@Mr.Leeroy
6 ай бұрын
@@inse001 add PTC (: multiple in series to be as high-tech as you desire
@don_cc123
7 ай бұрын
Any possibility you missed diode D4 on your schematic? My guess would be a zener to prevent excessive gate voltage.
@igormorozov6801
6 ай бұрын
looks like zener 4.7 or 5.1v. So mosfet 2n100 has less than 0.7A current flow at this gate voltage. And 1D transistor with 7.5R shunt resistor limits mosfet at 0.6v/7.5R = 80mA.
@michaeltuckey7
7 ай бұрын
Great video! Thanks for sharing, just what I need to step my discharge game!
@jerril42
7 ай бұрын
The comments here did not disappoint, all that electrified testosterone 🤣🤣🤣
@TheEmbeddedHobbyist
7 ай бұрын
looks like just another death trap! rated up to 650V with one layer of heat shrink over some of the tracks. the probes exposed. etc. Good job they got it checked by UL for safety, they did didn't they. 🙂
@IMSAIGuy
7 ай бұрын
Uncle Larry said he liked the shape and approves 😂
@TheEmbeddedHobbyist
7 ай бұрын
Not sure if Uncle Kim Cuck Augustus here in the uk! They said they have not see it, but feel anyone using it on 650V may not be able to complain in person so its OK 🙂 @@IMSAIGuy
@willthecat3861
7 ай бұрын
@@IMSAIGuy Does Uncle Larry live in Huaqiangbei Shenzhen?
@karlmartell9279
7 ай бұрын
This thing is absolutely over the top. A simple resistor always served its purpose.
@Agent24Electronics
7 ай бұрын
I kinda like it, especially the pins. Looks much easier to get a good connection with than the flimsy leads of most resistors. And the LED gives you a discharge indication. I mean, I have just used a resistor up until now, but this thing is tempting...
@Edisson.
7 ай бұрын
@@Agent24Electronics add a circuit with an LED to the resistance and you have an indication too, that's how my discharger works (described in a separate comment)
@pault6533
7 ай бұрын
@@Agent24Electronicswhen the indicator goes out there is still charge left. Need a resistor to finish the discharge to zero anyway.
@joshadler7209
7 ай бұрын
Try safely discharging a 2700uF with 400V on it. Not really that simple any more.
@colinellicott9737
6 ай бұрын
@@joshadler7209 Yep. Built a few ceramic resistor jumpers to do it safely and reliably.
@byronwatkins2565
7 ай бұрын
Voltmeters also leak... more than capacitors. 12V/200k=60uA collector current needs only Vb=0.4-0.5 V. Plus, the collector and drain also leaks. I doubt whether the current source had reached its constant current region.
@samikadouri3073
7 ай бұрын
I do use an old bulb 220v 60w it is so simple but it is an easy way to check the full discharge But yours it is fun to do Good day to you
@ozzymandius666
7 ай бұрын
Meh. You can't even use it as a screwdriver.
@Wolf359HeavyIndustries
6 ай бұрын
I got one, but it only discharged our 820kF capacitor down to 3.9V. A tragic crowbar disaster ensued. Though no digits were lost, a very exuberant "YIKES!" was had. a new crowbar is in the budget.
@mr1enrollment
7 ай бұрын
I have survived 55+ years of electronics endeavors without one of these, just saying.
@willthecat3861
7 ай бұрын
I agree.
@simsys_outdoor
7 ай бұрын
Hi, Just put your great meter U1272A into first mode from left. It is called "ZlowV" voltage measurement. Done! For everyone else who doesnt have this, yep, looks intersting ;) PS. Same you can find in Fluke 289; it is called LoZ.
@joshadler7209
7 ай бұрын
Unless your capacitor is storing more than a few joules, then don't do this, unless it is time for a new great meter.
@rfburns5601
7 ай бұрын
If its anything below 5,000 microfarad, I'll short it with the needlenose pliers. Above 5,000 mF, I'll stick the voltmeter across the cap; usually the bleeder will pull it down to a safe level in under a minute, then I'll short it. But hey, I'm just a hairy hand knuckle draggin' mouth breather. This looks like something Mr. Carlson would design. He's a smart guy, but he is realllly pedantic.
@IMSAIGuy
7 ай бұрын
he did make a cap bleeder. for his patreons only of course. way over kill with large resistors.
@anandarochisha
6 ай бұрын
Pedantic is the price he pays, not what we pay. With a gift like that, he has a well worn groove for explaining over and over until the light comes on for the rest of us..arguably..too worn. Gifted people are more about understanding the convoluted rules of disciplines that confound the rest of us on basic approach. In that sense the repeats are because half his audience are 30 IQ points behind YOU. Just saying.
@dimBulb5
7 ай бұрын
Cool! May not be necessary, but I'm getting one anyway 😀
@meatballtn
7 ай бұрын
Old school screwdriver is a lot more fun .
@pault6533
7 ай бұрын
@7:30 "We're Done" - Really?!? Still has voltage. With all those diodes, there will be residual. If I subsequently attach it to a LCR meter I could still damage it.
@fjs1111
7 ай бұрын
Your videos are so great, these days I click the "Like" button before the video even starts
@charlesnelson619
7 ай бұрын
What's your current limit set at on supply ?
@RommudohDev
6 ай бұрын
I just stumbled across one, too. But it seems you are missing diode D4 in your schematics - is it just not relevant for the circuit? I noticed, because mine has a fancy Zener diode there and then re-viewed your video. Your variant seems to have a black diode there, but could still be a Zener, too. Could it be to protect the gate of the FET?
@scrook1027
7 ай бұрын
I've always just used an old screwdriver (has lots of black spots on it). In my 60 some years of fiddling with electrons, never occurred to me to use some fancy cap discharge thingy.
@inse001
7 ай бұрын
Electrolytics charged to 400V in PFC stages are not funny to short with a screwdriver
@scrook1027
6 ай бұрын
@@inse001 Probably no worse than the anode on a large CRT. Some give off a really loud bang!
@inse001
6 ай бұрын
@@scrook1027 just a rough estimation: energy in a CRT ~mJ, energy in a decent capacitor ~J Had been working in a TV workshop back in the days and never been afraid of discharging CRTs
@pvc988
7 ай бұрын
Ohh, yeah. I hate it when there is still some residual AC voltage left in the cap.
@TheEmbeddedHobbyist
7 ай бұрын
but you do have to buy the correct AC cap's for that to occur. 🙂 normal one just get left in the last charged polarity.
@capriracer351
7 ай бұрын
That is what the diode bridge is for. To convert it to DC before it discharges😉.
@sefarkas0
7 ай бұрын
Maybe 20ma on the hp because the cc limit control is not turned full cw
@lmamakos
7 ай бұрын
The real test would be to discharge a CRT anode. What part on that device makes smoke first? I've only had to do that once or twice when working on my Heathkit H-19 terminal, and it was always an exciting process.
@stevenflogerzi1955
7 ай бұрын
Was your hp power supply limited to 20ma as the current dial is turned down, maybe if it was turned more to the right it would display the correct current draw of the discharger.
@wiwingmargahayu6831
7 ай бұрын
yeah more amazing book sir
@Edisson.
7 ай бұрын
Hi, the discharger has one advantage and that is the size, my discharger is a 4x6x3 cm box with classic 4mm connectors and I can connect spikes, clips, or connect to another test fixture for automatic discharge of capacitors. Discharger assembled from resistors, but I added a two-color LED so I can see the polarity in the discharged circuit (if it is on the red socket + the LED lights up red and - green) with a fixed connection, you can switch a small switch after the LED goes out and the terminals are shorted (just don't forget switch back before the next measurement). I've been using it for years without the slightest problem, built from scraps. Nice day 🙂 Tom
@rocketman221projects
7 ай бұрын
Your discharger doesn't have the disadvantage of burning a hole in your finger if a piece of heatshrink breaks down though. There's no way I would trust a single layer of the cheapest Chinese heatshrink to protect me from a big 400V cap.
@Edisson.
7 ай бұрын
@@rocketman221projects You're right, the wall of the box is 4mm, the only downside is the switch, originally I had a lever switch with automatic return, but then I changed it to a classic switch so that I don't have to hold it in case I need to get rid of the capacitors' back absorption. It is tested at 650V DC, that is the maximum voltage of my capacitor DC leakage meter (the meter can discharge the capacitor by itself after the test is finished). Nice day 🙂 Tom
@anandarochisha
6 ай бұрын
This item is actually cheaper than a 50 ohm metal ohmite 10w resistor from say digikey..how do the chicoms do it ?
@KonstantinGrigoriadis
7 ай бұрын
Nice Toy :-) for this Price, in the Video Called "SOLUTRONIC High Voltage Capacitor Discharger", I reversed Engineered a Professionally HV Capacitor Discharger, made for Internal use in the Factory of a Large German Inverter Manufacturer !
@keithking1985
6 ай бұрын
What's the transistor that's in it can you tell us or does it really matter what type? I think I see a SOT PACKAGE "1D" a 300v npn . Is that right??? And it uses a 1000v fet. (From my quick check on them) 😊😊😊😊
@IMSAIGuy
6 ай бұрын
MOSFET
@WestCoastMole
6 ай бұрын
I wonder if one of those Gizmos can discharge my 3300 volt 1 amp Linear Power Amplifier power supply😊
@IMSAIGuy
6 ай бұрын
I want to be in the back of the room watching when you try 😎
@keithking1985
6 ай бұрын
I'm going to make one 😊😊😊
@malithamadusankasadaruwan9836
7 ай бұрын
your schematic circuit D4 diode missing
@chrisscott1547
7 ай бұрын
Why? I just short hv caps. If it pops, need to find a the bad bleeder R.
@RED-bn3lu
7 ай бұрын
i use an fridge bulb with 2 legs.
@bobkozlarekwa2sqq59
7 ай бұрын
A 10-20 ohm resistor is much easier
@mx.olydian2111
7 ай бұрын
Just lick it ¯\_(ツ)_/¯
@SeanBZA
7 ай бұрын
I use 56k 10W resistors, as i have a lot of them, and no bang when the capacitor is charged to 400VDC either.
@silverXnoise
7 ай бұрын
That’ll be a spicy “safety procedure” when I hit the 400-600V caps in my tube amp…
@universeisundernoobligatio3283
7 ай бұрын
I have some 3000F super capacitors not sure the discharging pen would survive.
@IMSAIGuy
7 ай бұрын
it is current limited so yes, it should be fine
@inse001
7 ай бұрын
What voltage?
@universeisundernoobligatio3283
7 ай бұрын
@@IMSAIGuy But I will have to hold it in place for 125hours to discharge the the 3000F super capacitor.
@universeisundernoobligatio3283
7 ай бұрын
@@inse001 3V
@universeisundernoobligatio3283
7 ай бұрын
@@inse001 3V T=(VC)/I
@bob_mosavo
7 ай бұрын
Cool‼
@mqblowe
7 ай бұрын
How do you store AC in a cap????
@pvc988
7 ай бұрын
Ancient Chinese Secret
@rfburns5601
7 ай бұрын
@@pvc988 Honey, we need more Calgon!
@Rade541
7 ай бұрын
For AC you need flux capacitor
@willthecat3861
7 ай бұрын
You need to visit Shenzhen, and pay, to learn secret. (Not everything free.)
@inse001
7 ай бұрын
The process is similar to generating single pole magnets
@user255
7 ай бұрын
Interesting circuit, but I don't see any use for it.
@oefzdegoeggl
7 ай бұрын
I had this thing. It is a piece of shit. Exploded on me 😄There are WAY better versions on ali with normal leads and a voltmeter.
@DIYPinoyTeknisyanOfficial
Ай бұрын
Your Diagram is Wrong😂😂😂
@OmarMekkawy
7 ай бұрын
Thank you for the video. Do you have a link for that product on AliExpress?
@pault6533
7 ай бұрын
Add the word “switch” in your search
@willthecat3861
7 ай бұрын
IMO, ridiculous. (Alibaba below average trash... with the usual disregard for human life.)
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