[sdiy] how to tell metal film resistors?

[Quincas Moreira]

Thanks for clearing that up guys, I shan't be making that blooper again ;)




On Mon, Apr 27, 2015 at 11:33 AM,  <ijfritz at comcast.net> wrote:
> Wow, you certainly do not want to rely on that info!  Your best bet is to
> order from a reliable supplier and to check anything critical that looks
> suspicious.
>
> Ian
>
> Sent from XFINITY Connect Mobile App
>
>
> ------ Original Message ------
>
> From: Quincas
> To: Roman Sowa
> Cc: synth-diy at dropmix.xs4all.nl
> Sent: April 27, 2015 at 8:04 AM
> Subject: Re: [sdiy] how to tell metal film resistors?
>
>
> Metal film has different color coding for the value, one extra line to allow
> for a digit after the period. Check out this page:
> http://www.musicfromouterspace.com/index.php?CATPARTNO=NONE&PROJARG=ELECTRONICS%2FRESISTORS%2FRESISTORS.php%3Fa%3Da&MAINTAB=SYNTHDIY&SONGID=NONE&VPW=1024&VPH=542
>
> Quincas.
>
>
> Sent from my iPad
>
>> On 27/04/2015, at 2:26, Roman Sowa <modular at go2.pl> wrote:
>>
>> You may try to estimate the tempco.
>> Put the resistor in refridgerator for couple of minutes (assuming there's
>> about +5 .. +10 deg.C), then measure resistance. Then hold it in your hand
>> for some time to heat up to body temperature and mesure again.
>> Metal film should show about 0.3% difference, while carbon one about 1.5%
>> or more.
>>
>> Roman
>>
>> W dniu 2015-04-26 o 16:35, Michael Zacherl pisze:
>>> Hi, it's a basic question, but actually, I don't know the answer:
>>> Say I grab an arbitrary resistor from the mixed parts bin, how can I tell
>>> if its carbon or metal film?
>>> Or I get resistors from ebay, and want to verify that all is good as
>>> ordered?
>>> Thanks, m.
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