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Old 12th March 2013, 12:11 AM   #351
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Originally Posted by SY View Post
Not inductance, but rather physical size and necessity of traces to match. It might work fine, but since inexpensive metal foils are small and will certainly work fine, I'll leave it to you to find out if the alternatives won't cause issues.
Sy,
IS there a simple explanation as to trace/resistor match statement. I am new to it all, but PCB design, especially. How big of an effect can trace size play on overall performance?
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Old 12th March 2013, 12:11 AM   #352
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Quote:
Originally Posted by Damon Hill View Post
When are metal foil resistors ever inexpensive, especially Z-foils?

Did you mean metal film? Preferably lowest Tc available (25ppm or less)
I believe you can get thin film SMD resistors in 10ppm for a dollar or less.
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Old 12th March 2013, 12:43 AM   #353
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Actually, I modeled a current generator in Tina with a 20uH inductor (with 47 ohm resistance) as an IV converter and it's not good. The Bode plot shows a flat response to about 10kHz, then rising rapidly from there. So, I non-inductive resistor would be much preferable in that location.
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Old 12th March 2013, 02:23 AM   #354
SY is offline SY  United States
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Quote:
Originally Posted by buzzforb View Post
Sy,
IS there a simple explanation as to trace/resistor match statement. I am new to it all, but PCB design, especially. How big of an effect can trace size play on overall performance?
As usual, it depends. Think of the resistances as part of the circuit and see if they are significant- for example, in a regulator sense line (very low current), they're not terribly important, but between the regulator output and the sampling point (high current), they matter a great deal since they cause a sampling error. I saw one preamp this weekend where every trace was laid out for perfect matching of lengths and widths side to side in a balanced circuit as well as channel to channel. Overkill, for sure, but it was really nice from an esthetic standpoint (which I do not discount!).

If memory serves, Analog Devices did a very nice publication on this. It might be worthwhile to poke around their website to find it (mine is a hard copy).

And I'll repeat something I've admitted to before- I absolutely suck at PCB design and leave it to talented folks like jackinnj or pinkmouse to do for me.
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Old 12th March 2013, 02:28 AM   #355
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I did the same in my Impasse preamp circuit. It takes planning for sure. Modern cad programs will show you trace length and when you pair with a sim you can also display heat rise of the copper and what not. Who let you peak inside their gear chassis?!
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Old 12th March 2013, 02:34 AM   #356
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A super nice fellow at Axpona, Douglas Hurlbut, who did a very good phono preamp (one of the five figure jobs). He walked me through the design, answered all my questions, and seemed pretty pleased that someone "got" the small clever things he had done.

Dynamic Sounds Associates - Phono II
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Old 12th March 2013, 08:29 AM   #357
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Thanks for the info.
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Old 12th March 2013, 11:14 AM   #358
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Quote:
Originally Posted by luvdunhill View Post
Modern cad programs
Duh, they already did a couple of decades ago, just not as inexpensive.
At university, I had to design and optimise a pcb layout, exercise part of a simulation class.
Sucker also had an auto-route button, aka dumbie trap.
(ship design includes the general electrical layout, design of the main switchboard, knowledge of generators, transformers, rectifiers, thyristors, power factors, etc.)
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Old 12th March 2013, 05:28 PM   #359
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Saturn PCB Design - PCB Via Current | PCB Trace Width | Differential Pair Calculator | PCB Impedance
Every one who does PCB design should have this on their desktop, it will give you all the data you require for your traces and vias.
Yep a nice looking PCB will generaly be good electronicly, as making things match and look nice is the icing on the cake.
Regulator feedback inputs (especially SMPS controllers) are very high impedance inputs, so the trace from the potential divider to this pin should be as short as possible, otherwise you can pick up noise, think of it as the most important trace for any PSU controller.
The other thing that you must think about is loop area when doing a PCB, that means you need to think of every signal as a pair of routes, the signal trace and its return path (the gnd trace, or better still for low level a plane).
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Old 20th March 2013, 04:34 PM   #360
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Just want to say that I tried with nice results resistors quite cheap bought from RS Components.
I am quite sure that the brand was Welwyn. The 0.5W series in particular.
RS still sells these parts.
Has anyone else tried them as well ?
They had quite big legs ... and as i said very cheap indeed. Like 1-2 euro for ten
As general purpose ... maybe out from the feedback path
But now that I have checked they have a better and more expensive series that looks incredibly similar to Holco resistors (and these are very good. I have two series attenuators built with them and like the sound a lot indeed).
The TCR=15ppm series.
Regards,
gino

Last edited by ginetto61; 20th March 2013 at 04:46 PM.
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