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December 06, 2022, 09:11:56 AM

Author Topic: Resister Sanity Check  (Read 234 times)

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Offline IntarsiaGuy2

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Resister Sanity Check
« on: April 05, 2022, 10:05:24 AM »
Based on the instructions on page 31, I would expect the 2.49K resister (no wattage mentioned - assuming 1/4 watt) would be smaller than the 220K 1W resister in the next step.  They are the opposite - the 2.49K resisters are large and look like 1 watt resisters.  The 220K resisters look like 1/4 watt.  (I measured the resistance to double check my color reading).  Just want to confirm this is correct before I continue.  Thanks.

Offline Paul Birkeland

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Re: Resister Sanity Check
« Reply #1 on: April 05, 2022, 10:31:44 AM »
The 2.49K resistors that we used for eons became tough to get because of supply issues, so we have a different part substituted (it's still a nice Vishay/Dale part).  It is indeed physically larger than the 220K resistors, which are somewhat smaller than might be expected for their power rating.  (The 220K resistors dissipate under 1/4W in operation, so the demands are pretty low)
Paul "PB" Birkeland

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Offline IntarsiaGuy2

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Re: Resister Sanity Check
« Reply #2 on: April 05, 2022, 10:38:03 AM »
Thank you for the quick reply.  Onward!