Resistors, electronics guys help me out, simple question:

krankguitarist

krankguitarist

Krankitupologist
Allright, I've got some extra 220k resistors layin around here. I need 1/2 watt resistors, and I don't know if these are 1/2 watt or 1/4 watt resistors.

Here's a picture:

resistors.jpg


The red violet orange resistor in there IS a 1/2 watt resistor, I just bought it today. Its in there for comparison (along with the penny)

The red red red resistors are a little bit smaller than the red violet orange. I dont have a hell of a lot of experence with resistors, and I know this is a painfully simple question, but...

Are the red red red resistors 1/2 watt or 1/4 watt resistors?

Thanks in advance :smack: .
 
Re: Resistors, electronics guys help me out, simple question:

Here ya go, From L to R 1watt, 1/2 watt, 1/4 watt and a penny.:)
100_1611.jpg
 
Re: Resistors, electronics guys help me out, simple question:

looks like half watters to me, carbon film.
 
Re: Resistors, electronics guys help me out, simple question:

Got any 1/8 watts there kmc? Those suckers are tiny. I hate trying to decipher the color codes. Half the time I use my meter on them anyway but still. It's like stamping "Made in USA" on a pin needle. :laugh2:

Them up top look like 1/2 watters to me too.
 
Re: Resistors, electronics guys help me out, simple question:

ErikH said:
Got any 1/8 watts there kmc? Those suckers are tiny. I hate trying to decipher the color codes. Half the time I use my meter on them anyway but still. It's like stamping "Made in USA" on a pin needle. :laugh2:

.
Click to expand...

NOPE ! Any Circuit that uses 1/8 watt resistors is probably one I shouldn't be messing with.:laugh2:
 
Re: Resistors, electronics guys help me out, simple question:

Sounds good to me :). I'll get to re-building the bias circut of me amp now that I know that I've got the right components.
 
Re: Resistors, electronics guys help me out, simple question:

Just out of curiosity, why is it that the industry continures to persist in using coloured rings as identifiers?:smack:

It would seem that a stamping of say "50k-10%-1/4W" would make life much easier. This should be possible (given even the small size of an 1/8th watt resistor) as wire gauge/temp ratings, etc are fairly easy to read, even on 22 gauge. Caps values are stamped, the very small ones included. OK, agreed, you might need a bit of magnification for some.

Always wondered this. Anybody know the answer?

Dave
 
Re: Resistors, electronics guys help me out, simple question:

krankguitarist said:
Sounds good to me :). I'll get to re-building the bias circut of me amp now that I know that I've got the right components.
Click to expand...

Good luck.:) I just rebuild the Bias board in my Princeton Reverb. I added a 50k trim pot to make it adjustable and replaced all resistors with 1 watt metal oxide resistors, A new 1000v IN4007 diode and a 100uf 100V Cap... I like to over build.:D
 
Re: Resistors, electronics guys help me out, simple question:

kmcguitars said:
Good luck.:) I just rebuild the Bias board in my Princeton Reverb. I added a 50k trim pot to make it adjustable and replaced all resistors with 1 watt metal oxide resistors, A new 1000v IN4007 diode and a 100uf 100V Cap... I like to over build.:D
Click to expand...

Saw a '65 princeton reverb down at the starving musician today, played through it a bit, friggin awesome sounding amp...but at $1000 a little outta my impulse-buy range ;).

As far as this one though, I now have a properly biased amp!

Runnin about 55mA right now, sounding great! Thanks for the input :).
 
Re: Resistors, electronics guys help me out, simple question:

greco said:
Just out of curiosity, why is it that the industry continures to persist in using coloured rings as identifiers?:smack:
Click to expand...
So people who don't know their numbers can still read the value of resistors?
 
Re: Resistors, electronics guys help me out, simple question:

greco said:
Just out of curiosity, why is it that the industry continures to persist in using coloured rings as identifiers?:smack:

It would seem that a stamping of say "50k-10%-1/4W" would make life much easier. This should be possible (given even the small size of an 1/8th watt resistor) as wire gauge/temp ratings, etc are fairly easy to read, even on 22 gauge. Caps values are stamped, the very small ones included. OK, agreed, you might need a bit of magnification for some.

Always wondered this. Anybody know the answer?

Dave
Click to expand...

Sometimes, these colored bands are a blessing. Sometimes they are a curse. The colored bands are nice on simple resistors because it is hard to print an alphanumeric value in some sort of ink/paint on a tiny, inconsistently shaped part like a low end resistor. Using alphanumeric charcters on each resistor, is like trying to label every M&M in bag of candy.

The curse happens when these resistors have been exposed to heat/dirt/chemicals/age...and this can make it hard to tell if a band is orange or red...or...red or brown.

There ARE actual alphanumeric characters printed on some very high quality resistors, when they vary +/- 1% from specs.

VERRRY tiny, but small sub-watt surface mount resistors, used in computers may have a value stamped on them, if they are the size of a large flea. The only thing that makes it possible, is that these eensy-teensy resistors are flat all over...like a microcopic brick. The flat surface makes this possible.
 
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Re: Resistors, electronics guys help me out, simple question:

Sludgenutz said:
Sometimes, these colored bands are a blessing. Sometimes they are a curse. The colored bands are nice on simple resistors because it is hard to print an alphanumeric value in some sort of ink/paint on a tiny, inconsistently shaped part like a low end resistor. Using alphanumeric charcters on each resistor, is like trying to label every M&M in bag of candy.

The curse happens when these resistors have been exposed to heat/dirt/chemicals/age...and this can make it hard to tell if a band is orange or red...or...red or brown.

There ARE actual alphanumeric characters printed on some very high quality resistors, when they vary +/- 1% from specs.
Click to expand...
Very well said.:) Electronic components are Mass produced. the industries standard value system has been place for years, And keeps the parts rolling off the Assembly line. If they had to hot stamp each part with it's numerical # it would slow production to a craw.
 
Re: Resistors, electronics guys help me out, simple question:

kmcguitars said:
Very well said.:) Electronic components are Mass produced. the industries standard value system has been place for years, And keeps the parts rolling off the Assembly line. If they had to hot stamp each part with it's numerical # it would slow production to a craw.
Click to expand...

True dat! If the electronics industry could save 1/10,000 of a penny to do things differently...they would!!!
 
Re: Resistors, electronics guys help me out, simple question:

I replaced a couple surface mount resistors today. These are the old ones, in the pic:

000_0081.jpg


This is where you can tell if you need glasses/bifocals/magnifying glasses! I got lucky, and did not disturb other resistors of the same size all around them. I used a large magnifying lens, and the solder station has two hot elements. Basically, it looks like a set of hot tweezers, to remove/install these tiny components.
 
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Re: Resistors, electronics guys help me out, simple question:

FWIW..(as always) It is not quite understood very often that resistors of a higher wattage can always be substituted for a lower wattage rating. It would be to your benefit to do so, Wattage ratings are a "minimum" value only and are predominately used by manufacturers to decrease manufacturing costs. The same can also be said for capacitors, diodes and most all components. "Over-engineering" does not have a downside (other than cost!)
No circuit ever created deems the use of "only" a 1/2 watt resistor where one was originally used, there are no "tone changes" associated with using a larger wattage resistor, only a longer life expectancy, smaller is asking for trouble!

Carbon comp vs. metal film is another discussion entirely but the principle remains the same... (I like carbon comps..... hard to find, but worth it!!)

Jeff Seal
 
Re: Resistors, electronics guys help me out, simple question:

Listen to Jeff. He knows his stuff. Otherwise, you might get
shocking.gif
 
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