Bottlehead Kits > Crack-a-two-a

Low Current C4S RC Resistor Substitution

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When building the low current C4S board, I accidentally broke both of my 220 ohm resistors that belong in the RC position (page 57 of the manual). Is it critical that I use 220 ohm, specific resistor material type, or certain brand?

I ask because I have some extra resistors that I was wondering if might work:


* 220 ohm vishay dale metal film
* 270 ohm carbon film
* generic 220 ohm carbon film (questionable source and quality due to bulk resistor box)
If not, which resistors do you recommend I purchase for replacing the broken ones?

Paul Birkeland:
The Dale 220 and carbon film 220 would be acceptable substitutes.  Just be sure to put a meter on them to double check the value.

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Would there be any downsides with using the dale resistor?
I'd imagine the reason it was carbon film in the first place was to minimize unnecessary cost.

Paul Birkeland:
Technically carbon composition is the best choice for that spot, but those suckers like to break if you aren't careful with them, so we changed over to carbon film.

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Could you please clarify why the resistor composition matters for a location?

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