<html><body><html><head><meta name="viewport" content="width=device-width" /><meta http-equiv="Content-Type" content="text/vnd.ui.insecure+html;charset=utf-8" /></head><body style="overflow-wrap:break-word; word-break: break-word;"><div class="mail_android_message" style="line-height: 1; padding: 0.5em">I'll buy the idea that consecutive parts off a production line of a +/- 10% part might be +7.1%, +7.2%, +7.15%, etc..., but all parts being manufactured consistently doesn't guarantee anything about how close each value is to the target value. A +/- 10% 1uF cap could be 1.1uF to 0.9uF, and that's all the manufacturer is promising. <br>
<br>
Justin <br>
</div><div class="mail_android_quote" style="line-height: 1; padding: 0.3em">On 5/13/19, 6:45 PM David G Dixon <dixon@mail.ubc.ca> wrote:<blockquote class="gmail_quote" style="margin: 0.8ex 0pt 0pt 0.8ex; border-left: 1px solid rgb(204, 204, 204); padding-left: 1ex;">
When I look at, say, those little blue or yellow film caps, it is simply<br />
inconceivable to me that they could be made 10% different from one another.<br />
If you've ever seen a continuous automated industrial process that cranks<br />
out millions of the same thing, the key feature is repeatability. In order<br />
for every part of the process to work, and for every piece of the assembly<br />
to fit together, every part has to be identical from one piece to the next.<br />
That is a recipe for 1% tolerance, not 10% or 20%.<br />
<br />
Matthew said:<br />
<br />
On the contrary, I don't think the basic process of manufacturing<br />
capacitors has changed much since the 1960s - they are still made by the<br />
same kind of machines out of the same kind of materials - so why should we<br />
expect those processes to give much different results today? Automation<br />
isn't magic, and it's likely to be used to reduce costs rather than to<br />
tighten tolerances, if the market seems to prioritize price.<br />
<br />
<br />
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