Topic: The sound of resistors & some tips

[rascal101]

Just how do resistors sound ...

Some information I gathered while browsing,

    http://www.sasaudiolabs.com/theory10.htm

Some tips ...

It is a good idea to put two resistors in series rather than parallel. I did some tests on metallic film resistors and measured capacitance in the order of 5pF. As such, putting them in parallel will cause capacitance to double while putting them in series will halve capacitance.

Based on my observation on my two CD players, two or three resistors (after the output op-amps whether internal of external) are placed in series leading to the RCA jacks. That way typical noises in the order of 1 MHz and below are filtered out. And speeds up signal transmission to output.

So as an example, instead of putting a single 1K resistor place two 500ohm resistors in series.

Cheers,

Rascal101

[ATJr.]

I did some tests on metallic film resistors and measured capacitance in the order of 5pF. As such, putting them in parallel will cause capacitance to double while putting them in series will halve capacitance.

hmmm....let me see... a 5pf accross a 1k resistor will have a corner freq. of  1 / 2x3.14xRxC =31.8MHz way above human hearing!!

[rascal101]

Sir 2ny,

Understand that it is beyond audio frequency. However, as a practice if it is possible to reduce parasitics and PCB would allow then I'd go for it.

Rascal101

[ATJr.]

yes....a different ballgame altogether...

[av_phile1]

Sir 2ny,

Understand that it is beyond audio frequency. However, as a practice if it is possible to reduce parasitics and PCB would allow then I'd go for it.

Rascal101

I won't argue the objective, it's the wisdom that escapes me.   The mathematics may be flawless, yielding peace of mind for someone who does the math.  I personally prefer spending time and effort in things that would matter most, at least commensurate to the labor.    I mean filtering out noise in the megahertz range???, I wonder if even bats would mind.  But... as they say, to each his own.  Peace 

[rascal101]

Understand that the contribution is miniscule but for a typical amp with hundred of resistors this small things do add up. 

[rascal101]

Putting resistors in series to reduce resistance may not be much but changing capacitors that do not lie in the signal path and using basically the same value? If its just because it has lower esr, what for? For decoupling applications better to add a metallic polyster to the electrolytic if the layout is bad.

[JojoD818]

Putting resistors in series to reduce resistance may not be much.

I believe it increases the resistance when you series and decrease when you parallel.

I also believe that with such flawlessness and considerations such a device can be used even at zero gravity.

 

[rascal101]

I believe it increases the resistance when you series and decrease when you parallel.

I also believe that with such flawlessness and considerations such a device can be used even at zero gravity.

 

Sorry, I was thinking capacitance but wrote resistance instead.