Value Statistics
Background
I got idea for this little research when I prepared list of components to buy. I wanted to know which component values are most commonly used in pedals so I could get more of them and less of ones that are less likely to be used. So I made simple application that goes through layout gallery and counts all resistor and capacitor values. I used 130 projects of all pedal kinds: overdrives, boosters, fuzzes, octavers, compressors, wahs, etc.
Common resistor values
Common capacitor values
I hope this will help you next time you plan shopping for components 🙂
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Bro I’m just getting into this stuff and I’ve been looking for something like this.
Awesome work. Very useful. Must have taken a long time.
VERY useful info!!! This saved me a lot of time from doing research to see which ones I have been using up the most. A great $$$ saver.
Hi
Great site.
My question: Why do common components have such “strange” values. For example so many builds seem to need a 22microF cap. Why not round off to 20? Similarly with resistors. What is magical about 47K when a 50K will probably do the same job. Similarly with values like 4K7 or 0.47K when “5” seems to be a useful rounding off figure?
Interesting question 🙂
Because 22µF IS a common value – (20µF is NOT). Likewise 47K is a VERY common resistor, where you’d be hard pressed to find a 50K. Pots usually come in common decimal values (100K, 250K, 500K, etc.), but resistors and caps tend to follow either E12 (12 values per decade, at 10% tolerance) or E24 (24 values per decade at 5% tolerance) values. When values were first established, they designated the next “step” (value) in each decade (power of ten: i.e. ohms/10’s of ohms/100’s of ohms/Kohms/10’s of Kohms/etc.) as being 20% greater than the last, so that a 10% tolerance would cover all the values in between that value and the next (or the last).
To wit:
E12 values: 1.0,1.2, 1.5, 1.8, 2.2, 2.7, 3.3, 3.9, 4.7, 5.6, 6.8, 8.2 – each is approximately 20% greater than the last, hence these usually have a 10% tolerance (e.g. a 120Ω resistor can be anywhere from 108Ω to 132Ω, and the next one up, a 150Ω, can be anywhere from 135Ω to 165Ω, so the “gaps” are few and small)
E24 values: 1.0, 1.1, 1.2, 1.3, 1.5, 1.6, 1.8, 2.0, 2.2, 2.4, 2.7, 3.0, 3.3, 3.6, 3.9, 4.3, 4.7, 5.1, 5.6, 6.2, 6.8, 7.5, 8.2, 9.1 – these are typically 5% tolerance, so each value is approx. 10% > the last. Again, for the same reason.
See?
Bravo, thanks!
How about the pots? Every box seems to have a few of them?
Thanks!
Maybe you could do one for electrolytic capacitors separate from others?
Fantastic, I’d been looking for something like this, thanks so much!