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Old 13th December 2012, 07:23 PM   #1
evovil is offline evovil  South Africa
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Default Do brands matter

Hi guys

Yes this is my first post but I've been browsing the forum for quite some time.

I'm a bit of a noob when it comes to electronics, I can put them together and i have a basic knowledge, probably more than some people, as I'm an engineering student, mechanical to be specific, and we did two years of basic electronics but mostly theory as you can expect.

My question is im trying to put together an O2 and living in South Africa I'm basically limited to ordering from RS Components. Now some of the parts in the BOM for the O2 I cannot find at RS. I can however maybe find a different brand. Identical specs, but the make is different.

Does it really matter which brand I use?

Surely in the extreme audiophile circles, it matters everything, but I'm not going to be listening with an oscilloscope.

Another question I have is that some part numbers differ slightly.

The part will have identical specs and be from the same manufacturer, but the part number will be slightly different. Case in point is this part (Buy Ceramic Multilayer Capacitors Capacitor radial MCLC SR21 22nF 100V AVX SR211C223KARTR online from RS for next day delivery.) which has the part number SR211C223KARTR, where in the BOM a SR211E223MAA is required.

Actually looking at my above question, it appears the difference between parts are the temperature range and the tolerance, but still, my question stands.

Regards and best holiday wishes
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Old 13th December 2012, 07:57 PM   #2
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Quote:
Does it really matter which brand I use?
Generally speaking, no it doesn't.
But just like clothes, cars, and computers, sometimes a different brand means you get a different product.
The 22nF cap you linked is a 100V part, whereas the BOM specs a 50V part. That shouldn't make any difference, especially where it's used in the O2 circuit.
If you still have doubts about your available parts, you may want to post a list of your questionable substitutions and the members here can sort out any that are outside the usable range for your project.
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Old 13th December 2012, 09:42 PM   #3
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What 'spud said. Keep asking questions. We're here to help.
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Old 13th December 2012, 09:52 PM   #4
DF96 is offline DF96  England
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Because RS caters mainly for the industrial market it specifies exactly what you will get. A hobbyist catalogue would not give so much detail; no good for industry, but simpler for DIY.

For most components the value and ratings are what matters: a 220ohm 0.6W metal-film resistor will be much the same from any reputable manufacturer. A published circuit will normally indicate where a specific item must be used. Sometimes this will be for sound engineering reasons; sometimes for reasons of audio fashion.
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Old 13th December 2012, 10:13 PM   #5
evovil is offline evovil  South Africa
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Quote:
The 22nF cap you linked is a 100V part, whereas the BOM specs a 50V part. That shouldn't make any difference, especially where it's used in the O2 circuit.
Ah yes I see the BOM does call for a >=50V, but there we go, 100V > 50V so that would be fine. The recommended part is also 100V afaik.

Quote:
Because RS caters mainly for the industrial market it specifies exactly what you will get.
Definitely more for the industrial side. Keep seeing resistors in reels of 5000. Definitely dont want to buy those, could get a bit expensive .

Quote:
A published circuit will normally indicate where a specific item must be used. Sometimes this will be for sound engineering reasons; sometimes for reasons of audio fashion.
For example the NJM4556 used is also becoming a mission getting a hold of. Will just have to use the alternative
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Old 14th December 2012, 02:04 AM   #6
qusp is offline qusp  Australia
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Quote:
Originally Posted by DF96 View Post
Because RS caters mainly for the industrial market it specifies exactly what you will get. A hobbyist catalogue would not give so much detail; no good for industry, but simpler for DIY.

For most components the value and ratings are what matters: a 220ohm 0.6W metal-film resistor will be much the same from any reputable manufacturer. A published circuit will normally indicate where a specific item must be used. Sometimes this will be for sound engineering reasons; sometimes for reasons of audio fashion.
I would add physical size and package to that, especially if talking SMD you can end up with a completely different part with the same specs
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Old 18th December 2012, 11:40 AM   #7
evovil is offline evovil  South Africa
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Thanks guys...

Probably only going to start on it in the new year, dont really have the time right now
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