Ken Stout
K.S. Electronics
Noblesville, IN
[EMAIL PROTECTED]
----- Original Message ----- From: "walter wood" <[EMAIL PROTECTED]>
To: "ELECTRONICS PROFESSIONALS LIST" <[EMAIL PROTECTED]>
Sent: Thursday, November 04, 2004 11:58 AM
Subject: Re: [Techs] Need Resistor Value (5 color bands - readable)//confusing
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:
http://intrepid-video.com/mailman/listinfo/techs_intrepid-video.comOne 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
>>>>>
>>>>>
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