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Power Off To Drain Capacitors?


Your multimeter is the right tool. Set the multimeter to its highest DC voltage range and carefully place the probes across the first filter capacitor. Top Straker Post subject: Posted: Fri Oct 01, 2004 6:32 pm Joined: Fri Jul 23, 2004 11:10 pmPosts: 657Location: AB, Canada ancient thread, but one other suggestion, applies While the power supply is on, a small current flows through the bleeder resistor, wasting a small amount of power. you're Dead now. 125amp plate current. http://macland.net/how-to/power-shutting-off.php

No submissions to crowdfunding sites or ongoing campaigns. Do not rely on insulated tool handles, rubber-soled shoes, etc., to protect you. I've been hit with 50,000V from a high performance ignition system, and my elbows hurt for the whole day. I got a couple of little burns from being thrown, but at least it was over quick. their explanation

How To Discharge A Capacitor Safely

Why I have no idea but holding down the power switch never works. This all works nicely, but when I turn off the system power switch just like the OP of this question, the capacitor banks stay charged. I was concerned that horrible rectifier and transformer side will cause problems to the regulator, so I added some extra capacitors. –AndrejaKo Apr 7 '11 at 12:31 add a comment| Your Reduce acoustic noise from capacitors Five questions about resistors Welcome to EDN's Components & Packaging Design Center Build an op amp with three discrete transistors A simple guide to selecting power

  1. Unplugging the computer, since the microcontroller continued to draw power, allowed the capacitor(s) in the power supply to discharge and then microcontroller to lose power. (You can actually hear this happening
  2. dsoukup / Geekslutz forum 15 KCK capacitor FRP / Geekslutz forum 1 Capacitor question mltamisin / Geekslutz forum 5 What's with in-circuit capacitor testing?
  3. I'm thinking that it might only drain them to the potential below which none of the pc components can be driven - lowest is probably 1.5v for LED's.
  4. That said, it's the current that kills you, and I don't wanna toy around with those caps even a little bit.
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Radio kicks ass. Check the power supplies. Can you change the dip switches to change the voicing? How To Discharge A Large Capacitor microwaves have some awesome parts in them which can be very useful) To short it out I recommend just using a plastic handled screwdriver and touching the contacts together. WarDad

GLOBAL NETWORK EE Times Asia EE Times China EE Times Europe EE Times India EE Times Japan EE Times Korea EE Times Taiwan EDN Asia EDN China EDN Japan ESC Brazil How To Discharge A Capacitor With A Multimeter In short, don't be overly obsessed with capacitor safety in PC PSUs. It eliminates the possibility of a leftover charge causing electric shock if personnel handle or service the equipment in the off state, believing it is safe. https://peavey.com/forum/viewtopic.php?t=35065 DO NOT do this with anything more than 16 volts or your screwdriver will not like you and possibly visit your skin.

These bleeders discharge the focus supply, but not the high voltage final anode feed. Discharging Ac Capacitor I read that you can strum a heavy power chord and turn the main power switch off, and once the power chord dies out then the amp is totally discharged. permalinkembedsaveparentgive gold[–]rogueman999 0 points1 point2 points 8 years ago(1 child)Yup. Capacitors will discharge on their own over time, and most are likely to be discharged after a few days so long as no external power or internal battery is charging them

How To Discharge A Capacitor With A Multimeter

The otherwise-unused off-throw contacts of the DPDT on/off power switch create a filter-capacitor-discharge path that exists only when you need it: when the supply is turned off. http://forums.silentpcreview.com/viewtopic.php?t=6123 permalinkembedsaveparentgive gold[–]xzxzzx 0 points1 point2 points 8 years ago(0 children)That's weird... How To Discharge A Capacitor Safely Before working on an appliance or electronic device, you must first discharge its capacitor; here are instructions to discharge a capacitor safely. Discharging Capacitors In A Tube Amp Instead of direct linking images, create a self post instead with some context.

Already have an account? his comment is here Trust your meter. Otherwise, a hazardous ground-fault condition may occur at on/off transitions.   Tweet Save Follow Save to My Library Follow Comments Follow Author PRINT PDF EMAIL Loading comments... I suspect that this is because a)the problem is with a logic error error on the motherboard being maintained with a charge, b) the biggest capacitors are in the PSU, which How To Discharge A High Voltage Capacitor

It was odd, my whole body and mind froze for a second, except my arm, which was shaking much faster than I could ever normally shake it. But these are a level of crap unto their own. What I like to do though is turn the switch on the psu OFF while the comp is still running (so usually in bios screen) and then hit the power button http://macland.net/how-to/power-point-handouts.php it can be done perfectally safely, but you dont really want to screw it up.

Home About wikiHow Jobs Terms of Use RSS Site map Log In Mobile view All text shared under a Creative Commons License. How To Discharge A Capacitor With A Light Bulb permalinkembedsaveparentgive gold[–]unrealious 1 point2 points3 points 8 years ago(5 children)See Flintstones. Suppose you choose the RB fix for this supply and opt to achieve 90% discharge of the 4400-µF capacitor within 10 sec after turning off the supply.

so i tried to touch some stuff.....

Capacitors come in many types, shapes, and sizes; the most common by far in consumer electronics are electrolytic capacitors, and solid polymer capacitors. First is their design; it's almost impossible to shock yourself with one. permalinkembedsaveparentgive gold[–]dandlion 0 points1 point2 points 8 years ago(0 children)I built one recently and a google search suggested that there were Grounding problems that caused this. How To Discharge A Capacitor With A Screwdriver permalinkembedsavegive gold[–]xzxzzx 2 points3 points4 points 8 years ago(1 child)No; that dance is unnecessary showmanship.

Account Activated Your account has been reactivated. Man, what a shock! And I don't think that holding the power button resets the CMOS, either -- you need to jump the appropriate pins on the motherboard to do that, generally (or remove the navigate here The only capacitor at play here will be to debounce the switch, keeping it from misfiring repeatedly.

DON'T MISS ANOTHER ISSUE OF EDN IN YOUR INBOX! You need an account to post a reply. While capacitor safety is very important, when it comes to consumer power supplies life is a lot simpler than what this myth would lead you to believe. And it was not, actually, discharging the capacitors that fixed it, but rather cutting power to the microcontroller.

we just passed 300V. Not the answer you're looking for? Top fancontrol Post subject: Posted: Mon Jul 12, 2004 10:31 pm Joined: Mon Feb 10, 2003 11:19 amPosts: 291 Shorting the green (PWR_ON) wire with a black (GND)