Re: Insight and serial stacking

206.173.186.106

Posted by Dave B on May 20, 1999 at 14:29:17

In Reply to: Re: Insight and serial stacking posted by jk on May 20, 1999 at 13:11:17:

jk, :-)

I didn't get busy and forget(I'm at home under the weather), I was really hoping that it might stimulate you to search for the answer and share it with me. A technique my first mentor used on me. :-)

A passive component(L's, C's & R's) always have parasitic characteristics of the other passive components, it's not. Although it's primarily a resistor in this case, it has some inductance and maybe a trace of capacitance. In this case, you are processing an AC signal through these resistors and as you connect them in series, you're increasing parasitic inductance L by L1+L2+L3+L4....& so on. As the AC signal varies frequency(music), you also are dealing with inductive reactance (Xl= 2*Pi*f*l) which becomes more significant as f increases. So, as you connect these is series, you are detracting from their singular performance. It's much better to parallel resistors, the parasitic inductance is minimized //L= [1/(1/L1)+(1/L2)+(1/L3)...]

The Rodersteins are probably metal films, the Caddock is probably thick film(cermet) and the black axial lead Vishay was probably a stock wire wound. The Caddock at 518k was probably pretty bad, thick film gets pretty noisy up in this resistance range. BTW, what power rating resistor are you replacing and what are you replacing with? The Vishay BMFs are like 1 or 2W. The 32.25k resistor will be no problem with my new scheme but the 518k will be next to impossible unless I make it a looong core and it's going to be expensive to manufacture, because of all the winding.

What is the highest Rvalue you can get in the S102K?

Oh, the other reason, that's probably not relevant in this application, is enhanced power handling with R's in parallel.

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Follow Ups Full Thread

Topic - Hey Victor or any other expert- your thoughts on a ckt design quesion pls - jk 10:31:11 05/20/99 (18)

Here is some insight that may help. - Dave B 11:19:02 05/20/99 (17)

Re: Here is some insight that may help. - Doc B. 13:51:16 05/20/99 (1)

Busted!!! ....hehehe.... - Dave B 15:02:42 05/20/99 (0)

Re: Insight and serial stacking - jk 13:11:17 05/20/99 (14)

Re: Insight and serial stacking - john curl 16:13:04 05/21/99 (2)

Re: Insight and serial stacking - jk 12:26:03 05/24/99 (1)

Re: Insight and serial stacking - john curl 21:27:18 05/24/99 (0)

Re: Insight and serial stacking - Victor Khomenko 14:51:10 05/20/99 (8)

We meet again Victor.... - Dave B 15:18:23 05/20/99 (7)

Vishay inductance very low - Victor Khomenko 19:54:09 05/20/99 (6)

Re: Vishay inductance very low - Dave B 20:23:24 05/20/99 (5)

Thank you both - - jk 07:57:56 05/21/99 (4)

Re: Thank you both - - john curl 16:18:16 05/21/99 (1)

Re: Thank you both - - john curl 16:19:44 05/21/99 (0)

Re: Thank you both - - Dave B 09:19:53 05/21/99 (1)

its on its way, NT - jk 11:19:22 05/21/99 (0)

Re: Insight and serial stacking - Dave B 14:29:17 05/20/99 (1)

Hmm, trying to get me to use my brain huh? - jk 08:44:21 05/21/99 (0)

Follow Ups

Re: Insight and serial stacking - Dave B 14:29:17 05/20/99 (1)

Hmm, trying to get me to use my brain huh? - jk 08:44:21 05/21/99 (0)

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