[Message Prev][Message Next][Thread Prev][Thread Next][Message Index][Thread Index]

Re: End of Line Resistor - Are they a standard design?



"Mike Sokoly" <secure15@xxxxxxxxxxxxx> wrote in message
news:3lc%e.37805$TA2.1453@xxxxxxxxxxx
>
>
>
>
>
>
> Crash Gordon wrote:
>> Resistors can be gotten from any electronics supplier. Sometimes you
>> can't get the exact spot on value and have to fudge it a bit, but unless
>> its a really weird resistor you should be able to find replacement.
>>
>
> Remember that 4th band on the resisitor? Gold/Silver/None?
> You can get pretty close, then if your not exact: remember to look at the
> tolerance band: +/- 5%, 10%, 20% then do the math- if your intended value
> falls within the +/- % spec you're good to go!
> Mike S.
>>
I don't think so. If you're looking for a 2K resistor and you find a 2.5K -
20%, it could be anywhere from 2K to 3K. If it's more than 2.3K, you'd be
out of spec for many systems. You'd have to actually measure the resistor to
see what it's value is. Most resistors on the market today are 5%. Rather
than mess with tolerances, you'd be better off combining resistors in a
series or parallel configuration to get what you want. Resistors in series
add their values Rt = R1 + R2. For resistors in parallel  (R1xR2) / (R1 +
R2).

Bob




alt.security.alarms Main Index | alt.security.alarms Thread Index | alt.security.alarms Home | Archives Home