Yes, it is very confusing to me. I was just looking at a chart, and resistors can be marked with 3 to 6 bands. If there are 4 bands, the first 3 determine the resistance, and the4th band determines tolerence. Now is where I get lost. If there are 5 bands the first 4 determine resistance, and the 5th determines tolerance. 6 bands is just an extension of that with 5 being tolerence, and 6 being temperature coefficient. I'm just not sure what to do with 4 bands for resistance. I'm guessing that the 4th band(on a 5 or 6 banded resister) is the multiplyer, so that it can be very precision, and/or odd value. Anyone wish to speak to this? walter --- Gary McCartney <[EMAIL PROTECTED]> wrote:
> One question. When we look at a resistor, how are > we supposed to know if > it is a 4 band resistor with the 5th band meaning > nothing, or if it is a > 5 band resistor with the 5th band being > important? Doesn't seem to make > too much sense. > > > > > Gary McCartney > > McCartney Electronics > Guelph Ontario Canada > Est. 1984 > email: gary (at) number63.ca > > > > > > > > Bil Green wrote: > > Jay, > > > > Someone finally replied with the correct value, > and sure enough > > it is 680 Ohms. One more thing to remember when > checking resistors. > > Red forth band means 2% tolerance (and the > fifth band doesn't > > really matter in most cases, I guess). > > > > > > Bil Green > > PC 1000 > > Mammoth Lakes, CA 93546 > > 760-924-1000 > > > > Wednesday, November 3, 2004, 5:22:39 AM, you > wrote: > > > > JC> Bill, > > JC> Thank you for the heads up on the RCA 2% > info. I've been in RF&Microwave > > JC> Calibration and repair for over 20 years, > and this is a new one on me. Of > > JC> course, RCA doesn't do much test equipment. > Hope the 2% does it for you. > > > > JC> Jay Cashman > > JC> Jay Cashman Services > > JC> 3824 Ance Creek Rd > > JC> Reeds Spring MO. 65737 > > JC> (417)272-9789 > > JC> Satellite, Home Entertainment and Computer > > JC> Installation, Service and Repair > > JC> ----- Original Message ----- > > JC> From: "Bil Green" > <[EMAIL PROTECTED]> > > JC> To: "ELECTRONICS PROFESSIONALS LIST" > <[EMAIL PROTECTED]> > > JC> Sent: Tuesday, 02 November, 2004 12:44 > > JC> Subject: Re[2]: [Techs] Need Resistor Value > (5 color bands - readable) > > > > > > > >>>Hi Jay, > >>> > >>>Thanks for your advice. Someone suggested that > it may be 680 Ohm (with > >>>the red indicating 2% - common with RCA > flameproof) and I suppose you > >>>would disregard the white band. > >>> > >>>Andrews Electronics has one in stock, so I > ordered it and will check > >>>the resistance tomorrow when I get it. I hope > it's very rare that > >>>those selected resistors are used. > >>> > >>> > >>>Bil Green > >>>PC 1000 > >>>Mammoth Lakes, CA 93546 > >>>760-924-1000 > >>> > >>>Tuesday, November 2, 2004, 9:50:51 AM, you > wrote: > >>> > >>>JC> Bill, > >>>JC> This seems to be a "selected value" > resistor, and starting with the > > > > JC> band > > > >>>JC> closest to one end of the resistor, you > read the exact value of the > >>>JC> resistor, either 68129 ohms or 92186 ohms. > It's a pain in the butt, > > > > JC> but > > > >>>JC> you're looking at measuring many of your > stock resistors to find one > > > > JC> with > > > >>>JC> the exact value - and pray that your DMM > is accurate to 1 ohm. This > > > > JC> is > > > >>>JC> probably a current setting resistor, so > you could even put in a 10k > > > > JC> pot as a > > > >>>JC> rheostat and set the value that way, then > "tweak" it untill the > > > > JC> circuit > > > >>>JC> works properly. > >>>JC> Good luck! > >>> > >>>JC> Jay Cashman > >>>JC> Jay Cashman Services > >>>JC> 3824 Ance Creek Rd > >>>JC> Reeds Spring MO. 65737 > >>>JC> (417)272-9789 > >>>JC> Satellite, Home Entertainment and Computer > >>>JC> Installation, Service and Repair > >>>JC> ----- Original Message ----- > >>>JC> From: "Bil Green" > <[EMAIL PROTECTED]> > >>>JC> To: "[EMAIL PROTECTED]" > <[EMAIL PROTECTED]> > >>>JC> Sent: Tuesday, 02 November, 2004 01:50 > >>>JC> Subject: [Techs] Need Resistor Value (5 > color bands - readable) > >>> > >>> > >>> > >>>>>Panasonic PV-DM2799 > >>>>>27" TV-DVD-VCR > >>>>> > >>>>>The SMPS is not running and I found an open > resistor, and > >>>>>a shorted STRG6651 power converter chip. > D1508 was also > >>>>>shorted. > >>>>> > >>>>>Scraping the coating off of one side of the > 1/4W resistor, > >>>>>I was able to measure as high as 100 Ohms > from each end to > >>>>>the break in the center. > >>>>> > >>>>>It's not at all burnt, but ~200 Ohms or so > isn't even close > >>>>>to the color code (any way I read it). My > trick didn't work > >>>>>this time! > >>>>> > >>>>>The colors on the resistor are as follows: > >>>>>BLUE - GRAY - BROWN - RED - WHITE > >>>>> > >>>>>or it could be read: > >>>>>WHITE - RED - BROWN - GRAY - BLUE > >>>>> > >>>>>The STRG6651 reads 5 Ohms from pin 3 to pin > 4 so I figure > >>>>>it's toast. > >>>>> > >>>>>Bil Green > >>>>>PC 1000 > >>>>>Mammoth Lakes, CA 93546 > >>>>>760-924-1000 > >>>>> > >>>>> > >>>>>_______________________________________________ > >>>>>Tech Repair CD...order your just $49.00 plus > shipping...One year of > >>> > >>>JC> updates free. > >>> > >>>>>www.intrepid-video.com www.tech-repair.net > >>>>>Techs mailing list > >>>>>[EMAIL PROTECTED] > >>>>>http://intrepid-video.com/mailman/listinfo/techs_intrepid-video.com > >>>>> > >>> > >>> > >>>JC> > _______________________________________________ > >>>JC> Tech Repair CD...order your just $49.00 > plus shipping...One year of > > > > JC> updates free. > > > >>>JC> www.intrepid-video.com www.tech-repair.net > >>>JC> Techs mailing list > >>>JC> [EMAIL PROTECTED] > >>>JC> > http://intrepid-video.com/mailman/listinfo/techs_intrepid-video.com > >>> > >>> > >>>_______________________________________________ > >>>Tech Repair CD...order your just $49.00 plus > shipping...One year of > > > > JC> updates free. > > > >>>www.intrepid-video.com www.tech-repair.net > >>>Techs mailing list > >>>[EMAIL PROTECTED] > >>>http://intrepid-video.com/mailman/listinfo/techs_intrepid-video.com > >>> > > > > > > > > JC> > _______________________________________________ > > JC> Tech Repair CD...order your just $49.00 > plus shipping...One year of updates free. > > JC> www.intrepid-video.com www.tech-repair.net > > JC> Techs mailing list > > JC> [EMAIL PROTECTED] > > JC> > http://intrepid-video.com/mailman/listinfo/techs_intrepid-video.com > > > > > > _______________________________________________ > > Tech Repair CD...order your just $49.00 plus > shipping...One year of updates free. > > www.intrepid-video.com www.tech-repair.net > > Techs mailing list > > [EMAIL PROTECTED] > > > http://intrepid-video.com/mailman/listinfo/techs_intrepid-video.com > > > > > _______________________________________________ > Tech Repair CD...order your just $49.00 plus > shipping...One year of updates free. > www.intrepid-video.com www.tech-repair.net > Techs mailing list > [EMAIL PROTECTED] > http://intrepid-video.com/mailman/listinfo/techs_intrepid-video.com > ===== Walter Wood United TV Service 501 Poplar St. P.O. box 602 Pulaski Tn. 38478 mailto:[EMAIL PROTECTED] _______________________________________________ Tech Repair CD...order your just $49.00 plus shipping...One year of updates free. www.intrepid-video.com www.tech-repair.net Techs mailing list [EMAIL PROTECTED] http://intrepid-video.com/mailman/listinfo/techs_intrepid-video.com
