De-engergizing a Capacitor

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donnie5336

Copper - Posts: 52

Joined: July 27, 2004

Location: United States

Posted: August 10, 2004 at 10:42 AM / IP Logged

I am taking my system out of my car and I lost the resistor that came with my cap. How can I safely discharge it without one. If i disconnect my battery , can I see if the radio will still come on (being powered by the cap) and leave it turned down very low and let it drain my cap that way? or what??

Donnie

xetmes

Silver - Posts: 586

Joined: May 18, 2003

Posted: August 10, 2004 at 11:00 AM / IP Logged

just leave a light (like the domelight) on and disconnect the battery

donnie5336

Copper - Posts: 52

Joined: July 27, 2004

Location: United States

Posted: August 10, 2004 at 12:12 PM / IP Logged

I dont have my voltmeter here and i know energized caps are dangerous so i wanna make sure. if i disconnect the + of my battery and open my doors, the domelight slowly goes out. I have a digital display on my cap but it only comes on when the HU cuts on. When the lights slowly dim like that when i disconnect the battery, can i assume that teh cap has discharged?

Donnie

donnie5336

Copper - Posts: 52

Joined: July 27, 2004

Location: United States

Posted: August 10, 2004 at 12:41 PM / IP Logged

anybody???

Donnie

xetmes

Silver - Posts: 586

Joined: May 18, 2003

Posted: August 10, 2004 at 12:54 PM / IP Logged

yea its discharged, leave it sit for a few min after the light goes out if you are really paranoid De-engergizing a Capacitor -- posted image.

donnie5336

Copper - Posts: 52

Joined: July 27, 2004

Location: United States

Posted: August 10, 2004 at 12:59 PM / IP Logged

thanx

Donnie

flynntech

Copper - Posts: 275

Joined: April 15, 2004

Location: United States

Posted: August 11, 2004 at 12:41 AM / IP Logged

stick a screw driver between the terminals.....

NO, just kidding!!!

My boss told me to test batteries like this when I worked a junkyard! This guy was an idiot, he was a typical kneck. He scratched his head at the site of my multimeter, yet thought nothing of arc welding the mechanic's $60 snap-on screwdriver to some old battery lying in the dirt! ...So glad I can look back and laugh at these things.

flynntech

Copper - Posts: 275

Joined: April 15, 2004

Location: United States

Posted: August 11, 2004 at 12:43 AM / IP Logged

If your dome lights are out and your battery is disconnected, what would the voltmeter read?

.........ahhhh!

donnie5336

Copper - Posts: 52

Joined: July 27, 2004

Location: United States

Posted: August 11, 2004 at 11:46 AM / IP Logged

haha lol thanx . I got it. I was pretty sure that would work but i was doing something at my fuse block once and forgot about the cap.. i was thinking only one side of the block was hot with my fuse out... ouch.

Donnie

delphidoc

Copper - Posts: 53

Joined: June 13, 2004

Posted: August 11, 2004 at 11:39 PM / IP Logged

Here's three links on capacitor discharging. The sites are related to appliances, but it applies to all capacitors:

http://www.gallawa.com/microtech/safety.html

http://www.ehow.com/how_16749_discharge-capacitor.html

This next one is the best: http://fixitnow.com/2003/06/mailbag-discharging-and-testing.htm

because Samurai Appliance Repair Man has his own forum with entertaining stuff like this:

http://www.fixitnow.com/forumfools.htm

Enjoy. De-engergizing a Capacitor -- posted image.

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