help with resistors please

[aragorn723]

Hi,

I want to reduce the output of my quickie 6db, and was wondering if this would be a good choice?

http://www.radioshack.com/product/index.jsp?productId=12554379&prodFindSrc=cart

Not too familiar with NTE, can someone say whether these are good for audio or not?

Thanks,

Dave

 

[mcandmar]

Not heard of them myself, and the specs are nothing stellar but should work fine for attenuating an audio signal.

These ones have slightly better tolerances http://www.radioshack.com/product/index.jsp?productId=12554370&filterName=Type&filterValue=1%26amp%3B%23047%3B4-watt+resistors

 

[Grainger49]

As luck would have it, Radio Shack doesn't make resistors.  They just sell them. 

Metal film are low noise resistors.  Flameproof is not necessary in this situation.  The power rating could be as low as 0.1W.  Higher power ratings are fine. 

Dave, I don't know where you are.  If in the states I buy from Mouser and Digi-Key often.  Digi-Key has a first class mail option for shipping and resistors are small.

 

[Paul Birkeland]

I want to reduce the output of my quickie 6db, and was wondering if this would be a good choice?

Hello Dave,

Just for clarification (mostly for other readers), the goal would be a 6dB reduction at the input of the Quickie. 

Any old carbon film or metal film resistor should work well.

-PB

 

[aragorn723]

how about these?  Didn't see the option for $3 shipping last night.

http://www.digikey.com/product-detail/en/CMF60100K00FHEK/CMF100KFA-ND/3621895

Would I need a set of these for each of the 2 inputs?

Dave

 

[Paul Birkeland]

1W resistors will be large and completely overkill.  Try RN55D's from Mouser, or CMF501's from Digikey.

In the Quickie, these are best installed at the pot, so you wouldn't need two sets.

-PB

 

[aragorn723]

ok, how about this one then:

http://www.mouser.com/Search/ProductDetail.aspx?qs=MB8hUBX66%252b9HjQXk7SpPSw%3d%3d

so the resistors would replace the two wires that come off the selector switch and go to the pot?  Thanks,

Dave

 

[Paul Birkeland]

Yeah, replacing the pieces of wire with the resistors is one way to do it, though if they don't reach you may just want to instal the resistors with the bodies right up against the pot lugs, then solder the wires to the free resistor leads.

-PB

 

[Grainger49]

And, yes, those are excellent resistors.

 

[aragorn723]

Thanks.. just got the new resistors soldered in tonight.  Will this change the resistance and voltage measurements?  Thanks,

Dave

 

[Grainger49]

This should not change the voltage measurements.  It might change a resistance measurement on each channel.

I would check the voltage measurements and if they are good don't bother with anything but listening.

 

[aragorn723]

Thanks everyone, this made a difference in the volume control