Announcement

Collapse

Forum Rules *ALL NEW MEMBERS, PLEASE READ!! UPDATED!!*

First and foremost, Welcome to the Badcaps Capacitor Search Engine & Forums!

New members that have activated their accounts have limited access to certain features of the site until established. Members with zero posts have no access to the private messaging system. Also, members with zero posts may not edit certain profile attributes, such as signatures. New members also may not create new threads. However, new members with zero posts have full access to all technical information contained on this forum, and that also includes attachments (images and files that other members have uploaded), and new members that have activated their accounts are free to post replies to existing threads. If you wish to create a new thread, the fix is simple! All you need is ONE post to be able to have full unrestricted access, and that can be simply posting an introduction of yourself or say hello in THIS THREAD. This may seem a little strange, but it helps keep spam and abuse curved. Please note, that it may take up to one hour from your first post for the limits to be removed. If you make a post and don't immediately see the restrictions gone, be patient. The promotion system updates every hour.

Please complete your profile after making your first post, with your name, locale, and other info. It's nice to know members on a first name basis, and know where they're from. Makes for a much friendlier environment!

Posting rules for this forum will be STRICTLY enforced by myself as the owner/administrator, and my moderator crew.

Badcaps.net IS A BUSINESS!!! If you are a servicer, service center, or vendor of any kind in the computer/capacitor industry, you are NOT permitted to advertise, link, promote, or plug your business on this forum in ANY way! NO EXCEPTIONS!! This includes asking for "donations" in exchange for BIOS passwords or tech advice for anything! If I see you doing that, your post will be edited or deleted, and you warned. If it happens again, you will be banned. The only exceptions are the references to the companies quoted in the FAQ which the administration have added for the convenience of those around the world who have difficulty to source caps for their repair.

This also includes using this forum's private message system to solicit business. Members, if you receive a PM from anyone offering repair services or components, please alert me immediately! Myself or any of my moderators, will never private message a user soliciting business, for Badcaps.net, or any other servicer/vendor. If you PM me about repairing your device, I will reply and take care of you, however, I will not message you first.

------------------------------------

Posting rules:

This forum was created to be a technical support forum primarily for the do-it-yourselfers who choose to repair their own boards. Any and all technical questions are welcome!

1) Please use the SEARCH feature!! Your question may have been answered in another thread! Please search first and see if it has!

2) When posting a technical question, be as detailed as possible in your thread. The more information we have about your specific problem, the better we can answer your question.

3) Please use COMPLETE sentences, punctuation, and grammar! Nobody is perfect, hence, a spelling error on occasion is no biggie. However, posts/threads that are unreadable will be deleted. This includes any and all forms of 'ebonics', leet, chatroom jargon, and 'text message' shorthand and slang. This forum is not a chatroom/text message, please use full words and complete sentences.

4) Keep discussion on topic!! DO NOT HIJACK THREADS! It's easy to do (I've done it myself a few times...) Lets try to keep it down to a minimal!! If you have something really off topic, that's what the lounge is for!

5) Keep things civil! There will be no tolerance for flaming, bashing, hateful remarks, racial remarks, adult material of ANY kind, and so on.

6) THE LOUNGE RULES! The lounge is a place for off topic chit-chat! If you post something that might be considered questionable or something you don't want kids to see, or something you can't view at work/school, etc, please label that thread *NWS* or NOT WORK SAFE in the thread title as a warning. The Lounge is NOT moderated, anything is welcome... Feel free to post rants, jokes, cars, hot women (remember the NWS warning in the title), or just about anything within reason. It's an open forum! Please refrain from participating in political topics if you have thin skin, they can get heated sometimes!! Remember that we have members here from all over the world, with many different views and cultures. Political debates can turn really ugly, and really fast, and if they degrade to personal attacks and useless banter/bashing, moderator action will ensue. I want this forum to be a safe haven for technical discussions from all walks of life, so lets keep off topic discussions civil and friendly.

7) Spamming and spammers will NOT be tolerated or accepted in any way, shape, or form! Spam bots are instantly and permanently banned, and their threads deleted! The mod crew is really quick to zap spammers, we typically pop them before they even get to post. This also includes regular members as well. be courteous and not post spam. This includes links to off-site information that's not relevant to the thread at hand. Do not plug other websites, forums, or businesses in your signatures. You may do so in a thread if the off-site link you're posting is relevant to the topic, but otherwise, don't do it. If you see a thread which clearly a spam bot posting that we have not removed yet, DO NOT click any links in it!! Simply click the 'report bad post' button, and it'll be taken care of, usually within minutes.

8) Account removals & closures: Since no personal information is given in the creation of your Badcaps.net Forum account, requests to remove and/or delete accounts will be declined. Any requests for removal of threads & posts you created will also be declined. The reason is the missing posts can/will leave threads incomplete and fragmented. For the threads to be of help to others later on, information can't and won't be missing. However, if you inadvertently posted personal identifiable information in a post (such as an email address, real name, or phone number), please contact a staff member. In those cases, the post may be edited or removed, at the staff members discretion.

That's about it for the rules, the setup here is pretty loose. However, if you're caught violating any of the rules above, here's what will happen:

First offense: Warning by me or a moderator
Second offense: Banning for 1 day
Third offense: Banning for 3 days
Fourth offense: Banned permanently.

If you do something really dumb, or are just a troll, I will skip the warning and the temporary banning, and ban you permanently!

The rules are pretty cut and dry... However, if you have any questions about this policy, feel free to contact me.
See more
See less

The Resistor FAQ

Collapse
X
Collapse
 
  • Page of 1
  • Filter
  • Time
  • Show
Clear All
new posts
Previous template Next
    #1

    The Resistor FAQ

    The Resistor F.A.Q

    Resistors are a very important part of a Circuit. We all know that every little bit counts! So.. here's as much as you should need to know about Resistors that I know. (Mind you, I'm still learning; and in fact this is helping me to learn. Hope other's find help here!)


    What's the Schematic Symbol for a Resistor?





    What's the Code for all The Colored Strips on a Resistor?






    Here's two Free Resistor Code Apps for help:

    Electronics Assistant V4.31 & Resistor Color Coder 2.1


    How can you tell, just by looking at a resistor what 'brand' it is? Or Can you?

    Knowing the 'BRAND' of the Resistor isn't necessary. I would like to hear experienced Techs own loyalties on this however! So, what's the best BRAND of resistors in your opinion? (If someone Can, please do tell!)

    How can you tell what 'KIND' of Resistor A resistor is? Is it a Carbon Composition, Carbon Film, Metal film, Metal oxide Or wire wound?

    Metal Film:


    http://www.resistorguide.com/metal-film-resistor/





    I found these worth their read: http://electronics.stackexchange.com...nd-what-values

    https://learn.sparkfun.com/tutorials/resistors/all

    How do I know what Wattage the resistor is that I'm replacing?

    The Schematics give Voltage (V) to the Resistor and you know the Resistor's Ohm Value (From color codes). So.. after you Find Current (I) (from I= V/R) then you find P (wattage) = V(squared)/R






    Here's a Quote from Mariushm (BadCaps Veteran):

    "Usually, [the] white/cream resistors are carbon film, blueish/green resistors used to be metallic , carbon film resistors usually have lousy temperature coefficient and larger tolerance (5-10%) High wattage resistors are wirewound usually (let's say 1w or higher).

    Power dissipated in a resistor is calculated by formula IxIxR where i = current and r=resistor value and generally the recommendations are to not exceed about 70-80% of the resistor's wattage rating. 1w resistors are quite large. When in doubt, you can go with 0.5w resistors or 1w resistors instead of 0.125w or 0.25w resistors.


    Here's some other Resources (on Wattage):
    http://techtalk.parts-express.com/sh...wattage-rating

    http://www.robogaia.com/how-to-calcu...r-wattage.html

    On Resistors:

    http://www.mikroe.com/old/books/keu/01.htm

    What is the Electronic Industries Association (EIA) 'Preferred Values' for Resistors?

    Easiest Answer is to give you this site link:

    http://www.logwell.com/tech/componen...or_values.html

    Any additional information that is relevant will be greatly appreciated. Please add to this Museum of Needed Electronics Information! Namaste- <><
    Attached Thumbnails
    Attached Files
    Last edited by Keshetisrael; 03-24-2014, 03:56 PM.
    Tags: None
    #2
    The Resistor FAQ

    Personally, I'd really appreciate it if you wouldn't link to that ad filled site informer.com ... it basically spams Google with tons of keyword generated URLs ... just look at https://www.google.com/search?q=site%3Ainformer.com to see what I mean. Don't condone that style of website by linking to it.

    There are open source or free tools that are much more useful than a simple resistor color thing, for example I can mention Electronics Assistant : http://www.electronics2000.co.uk/


    As for the other questions.. usually white/cream resistors are carbon film, blueish/green resistors used to be metalic , carbon film resistors usually have lousy temperature coefficient and larger tolerance (5-10%)
    High wattage resistors are wirewound usually (let's say 1w or higher).

    Power dissipated in a resistor is calculated by formula IxIxR where i = current and r=resistor value and generally the recommendations are to not exceed about 70-80% of the resistor's wattage rating.

    1w resistors are quite large. When in doubt, you can go with 0.5w resistors or 1w resistors instead of 0.125w or 0.25w resistors.

    Comment

      #3
      Re: Resistors

      Here's a sampling of power resistors ranging from 3 watts to 225 watts. The one on the far left is a slider type variable resistor missing the slider.
      Attached Files

      Comment

        #4
        Re: Resistors

        "A typical radio shack resistor you will often see is a 2.2kohm resistor with 10% tolerance. The bands are "Red" (2), "Red" (2), "Red" (times 10^2), "Gold" +/- 10%." FYI: GOLD is 5%
        Never stop learning
        Basic LCD TV and Monitor troubleshooting guides.
        http://www.badcaps.net/forum/showthr...956#post305956

        Voltage Regulator (LDO) testing:
        http://www.badcaps.net/forum/showthr...999#post300999

        Inverter testing using old CFL:
        http://www.badcaps.net/forum/showthr...er+testing+cfl

        Tear down pictures : Hit the ">" Show Albums and stories" on the left side
        http://s807.photobucket.com/user/budm/library/

        TV Factory reset codes listing:
        http://www.badcaps.net/forum/showthread.php?t=24809

        Comment

          #5
          Re: The Resistor FAQ

          Can anyone tell me what watt this resistor is?

          Comment

            #6
            Re: The Resistor FAQ

            White , Yellow, Black as far as I can tell : 9 4 0 = 94 x 10^0 = 94 x 1 = 94 ohm.



            Attached Files
            Last edited by mariushm; 04-09-2014, 09:02 AM.

            Comment

              #7
              Re: The Resistor FAQ

              Originally posted by mariushm View Post
              White , Yellow, Black as far as I can tell : 9 4 0 = 94 x 10^0 = 94 x 1 = 94 ohm.



              thanks for the reply but its not the ohms im looking for its the watt.
              its brown black yellow gold.
              so my calculations are 100k with 5% tolerance.
              but its quite a big resistor so unsure of wattage! probs just going to get a 2W and hope for the best!

              Comment

                #8
                Re: The Resistor FAQ

                The pic is pretty blurred and can't tell what the coin is but that looks to me like a 1W 100K 5%
                brown black yellow gold

                Comment

                  #9
                  Re: The Resistor FAQ

                  hi its a uk penny. your colours are correct. ill get a 1 watt aswell as the 2 watt

                  Comment

                    #10
                    Re: The Resistor FAQ

                    It probably won't be a problem using a 2W if it fits.

                    Comment

                      #11
                      Re: The Resistor FAQ

                      cheers steve

                      Comment

                        #12
                        Re: The Resistor FAQ

                        High wattage resistors are wirewound usually (let's say 1w or higher).
                        2 W resistors are not all wirewound, there are many types of 2 W metal film resistors. 5 W and higher are always wirewound.

                        Comment

                          #13
                          Re: The Resistor FAQ

                          Ok struggling with this resistors value?
                          Anyone able to help?
                          the pink ones.

                          Comment

                            #14
                            Re: The Resistor FAQ

                            Looks like brown, black, gold, red, black.

                            Wasn't aware gold could be a middle band

                            Comment

                            Previous template Next
                            Working...
                            X

                            We process personal data about users of our site, through the use of cookies and other technologies, to deliver our services, personalize advertising, and to analyze site activity. We may share certain information about our users with our advertising and analytics partners. For additional details, refer to our Privacy Policy.

                            By clicking "I AGREE" below, you agree to our Privacy Policy and our personal data processing and cookie practices as described therein. You also acknowledge that this forum may be hosted outside your country and you consent to the collection, storage, and processing of your data in the country where this forum is hosted.

                            I Agree