broken 100w 1kohm resistor - can i use it? - Page 1
Forum section: electronics / general

author: Jobbig
author_rank: Newbie
timestamp: October 29, 2015, 03:44:12 pm
content: Hi, i am new here so im not sure if I post this right, I also want to apologize for my bad english.So, long story short, im building a tesla coil and one of the components is a "terry filter" in this filter on of the parts needed is a big resistor. I have a 100w 1kohm resistor made for high voltage but today i dropped the package the resistor was in and it broke in half, but the wire is still intact and holds the 2 pieces togheter. so i carefully put it back togheter to make sure that the wire was still intact and then but a tape around it to keep it together. Now, my question is; will it work or is it just to throw away? I run out of battery in my multimeter so i cant test it and see the resistance but if it showa the right resistance is it gonna be safe to use?its one of those:http://danotherm.com/files/product_pictures/wirewound/TRVE-small.jpgThanks in advance and again, sorry for my bad english.

author: AF6LJ
author_rank: Unknown
timestamp: October 29, 2015, 03:49:31 pm
content: You should be okay to use it.

author: Jobbig
author_rank: Newbie
timestamp: October 29, 2015, 03:54:42 pm
content: Ok, thanks!

author: continuo
author_rank: Frequent Contributor
timestamp: October 29, 2015, 03:58:59 pm
content: Quote from: Jobbig on October 29, 2015, 03:44:12 pmThere's nothing you can't fix with a roll of duct tapeBut seriously, it's rated 100w for a reason (I suppose), could get very toasty, be careful...

author: AF6LJ
author_rank: Unknown
timestamp: October 29, 2015, 04:10:49 pm
content: Quote from: Jobbig on October 29, 2015, 03:54:42 pmI would epoxy it back together and use a good quality tape such as Kapton to hold it together and provide a layer of insulation over the joint.

author: G7PSK
author_rank: Super Contributor
timestamp: October 29, 2015, 04:21:26 pm
content: Dont use duct tape or similar as it could catch fire, either good epoxy or ceramic cement. I used to fix them with a piece of stud (threaded rod) through the middle when they broke in old radios or TV's and were not already mounted by that method.

author: Jobbig
author_rank: Newbie
timestamp: October 29, 2015, 04:22:23 pm
content: Quote from: AF6LJ on October 29, 2015, 04:10:49 pmThanks for the tips but i dont gonna take off the tape that i put on becuse im scared to ruin the wire but im gonna see if i can get my hands on some of that tape you suggasted otherwise i gonna put multiply layers of "normal" electric tape over the joint.Quote from: continuo on October 29, 2015, 03:58:59 pmHahaGonna be careful when testing it.

author: Jobbig
author_rank: Newbie
timestamp: October 29, 2015, 04:26:28 pm
content: Quote from: G7PSK on October 29, 2015, 04:21:26 pmI'ts only going to be run in short periods of time and always being watched while on so i dont think that should be any worries. but thnaks for the tips!

author: Gyro
author_rank: Super Contributor
timestamp: October 29, 2015, 06:59:14 pm
content: It takes quite a lot of voltage to dissipate 100W in a 1k resistor - I make it just over 316V. Whilst it is probably not being used at full load, you need to make sure that whatever repair you make doesn't risk falling apart under load and causing a nasty short or shock hazard.

author: calexanian
author_rank: Super Contributor
timestamp: October 29, 2015, 07:34:39 pm
content: As mentioned before. Use some high temp epoxy or adhesive. Avoid metal filled ones such as JB weld and such. There are adhesives used for putting china plates and dishes back together. I recommend those.

author: RickBrant
author_rank: Unknown
timestamp: October 29, 2015, 08:27:54 pm
content: The tape you have wrapped around it (ANY kind of tape) will act as heat insulation - it will tend to trap the heat in the R. This is Not Good. You have effectively reduced its power rating, possibly by a large degree.If you must tape it, use the thinnest tape possible. NOT duct tape.

author: retrolefty
author_rank: Super Contributor
timestamp: October 29, 2015, 08:30:05 pm
content: Stainless steel hose clamp?

author: alsetalokin4017
author_rank: Super Contributor
timestamp: October 29, 2015, 08:48:30 pm
content: Quote from: G7PSK on October 29, 2015, 04:21:26 pmThis ^ .