nickey 0 Posted April 15, 2011 Share Posted April 15, 2011 In examining my fish tank aerator circuit, I am uncertain about the use and value of a couple of resistors. (I acknowledge I am a tinkerer and not an EE).. 1. What is the purpose of R2? is it needed? (I copied its use from a different relay driver circuit) 2. Though they both seem to do the job, how would I calculate the correct values of them? (I just started with them first as is) thanks water pump relay.doc Quote Link to post Share on other sites
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