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  1. matelot

    Help with De Morgan's theorem

    I am looking for help with using De Morgan’s theorems for solving a circuit problem. I learned about De Morgan’s theorems in classes about 35 years ago but have not used them since. I now help run a garden railway as part of a Society of model engineers. I have written a programme for an...
  2. matelot

    do you know these resistors?

    I have a bathroom fan delay circuit that has burned out two resistors. I have tried to simulate the circuit on Circuit Wizard but no matter what value I use the relay never closes. Is it possible Circuit Wizard is not simulating an AC circuit closing a dc relay? Would someone be able to tell me...
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